subject:(sensitised)

1. Hu, Yue. Exploring thiophene oligomers and ruthenium (II) complexes for their use in dye-sensitised solar cells.

Degree: PhD, 2016, University of Edinburgh

URL: http://hdl.handle.net/1842/19513

► Despite offering relatively high conversion efficiencies, dye-sensitised solar cells using liquid electrolytes containing either I-/I3 - redox couple or Co2+/Co3+ redox couple suffer from durability… (more)

▼ Despite offering relatively high conversion efficiencies, dye-sensitised solar cells using liquid electrolytes containing either I-/I3 - redox couple or Co2+/Co3+ redox couple suffer from durability problems, such as electrode corrosion and electrolyte leakage. Replacements for liquid electrolytes have been extensively studied, but the efficiencies of the resulting devices remain low. One of the factors that limit the efficiency is the sensitising dye. Large sized hole-transport material results in poor pore-filling and thus leads to a fast back electron recombination that reduces the effective electron diffusion length to few micrometeres. The optimal TiO2 layer thickness (2 μm) for maximal power conversion in solid-state dye-sensitised solar cell is much smaller than the 6-10 μm layer thickness required for quantitative light absorption by many dye molecules. Thus, dyes that can absorb in both visible and near-IR region with high extinction coefficient are needed. In order to achieve this, novel oligomers and ruthenium (II) complexes are designed, synthesized and studied as sensitisers for both liquid state and solid state dye-sensitised solar cells in this thesis. Series of ‘donor-free’ dyes including oligo(3-hexylthiophene) (oligo-3HT) (Chapter 3) and oligo(4,4-dihexyl-4H-cyclopenta[1,2-b:5,4-b’]dithiophene) (oligo-CPDTs) (Chapter 4) functionalized with cyanoacrylic end groups are easily synthesized using cross-coupling. They were fully characterised through electrochemical, spectroscopic and computational techniques, showing versatile colour-tuning, as well as outstanding absorption coefficients up to 75000 M-1cm-1. Liquid and solid-state DSSCs device performances are studied and discussed in terms of the dye structures. These dyes are effective sensitisers for liquid-state and solid-state dye-sensitised solar cells, although they do not contain a typical donor group, thus open a new strategy of designing dyes in the future. New dyes containing different azo ligands as an additional chromophore moiety to enhance light harvesting of Ru complexes (Chapter 5) have been prepared using a protection/deprotection strategy that allows for convenient purification. The absorption spectrum of the dyes showed an enhanced light harvesting compared to the N719 dye that lacks the azo ligand and electrochemical study also showed properties suitable for application as sensitisers in DSSCs. Following hydrolysis, the complexes were investigated in DSSCs, with performance investigated using I-V measurements. Poor performance was observed and we attribute this as mostly likely due to poor charge injection due to short excited-state lifetime. Although the application of these current dyes in DSSCs is not feasible due to their poor performance, this study allowed us to determine the positions of the HOMO and LUMO orbitals and correlate it to the π-acidity of the dyes.

Subjects/Keywords: 621.31; dye-sensitised solar cells

11 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hu, Y. (2016). Exploring thiophene oligomers and ruthenium (II) complexes for their use in dye-sensitised solar cells. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/19513

Chicago Manual of Style (16^th Edition):

Hu, Yue. “Exploring thiophene oligomers and ruthenium (II) complexes for their use in dye-sensitised solar cells.” 2016. Doctoral Dissertation, University of Edinburgh. Accessed March 07, 2021. http://hdl.handle.net/1842/19513.

MLA Handbook (7^th Edition):

Hu, Yue. “Exploring thiophene oligomers and ruthenium (II) complexes for their use in dye-sensitised solar cells.” 2016. Web. 07 Mar 2021.

Vancouver:

Hu Y. Exploring thiophene oligomers and ruthenium (II) complexes for their use in dye-sensitised solar cells. [Internet] [Doctoral dissertation]. University of Edinburgh; 2016. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1842/19513.

Council of Science Editors:

Hu Y. Exploring thiophene oligomers and ruthenium (II) complexes for their use in dye-sensitised solar cells. [Doctoral Dissertation]. University of Edinburgh; 2016. Available from: http://hdl.handle.net/1842/19513

2. Givalou, Lida. Μελέτη και παρασκευή ηλεκτροχημικών συστημάτων και εφαρμογές τους σε φωτοβολταϊκά.

Degree: 2017, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/42601

► The subject of this thesis is the development and study of photoelectrochemical systems based on quantum dots as well as their application in photovoltaic devices.… (more)

▼ The subject of this thesis is the development and study of photoelectrochemical systems based on quantum dots as well as their application in photovoltaic devices. The replacement request of conventional silicon solar cells, for higher efficiencies and lower cost, has led to the construction of cells with nanostructured materials which are deposited in the form of thin films. In the present thesis, photoelectrochemical cells sensitized with semiconductor nanocrystals (quantum dots) were constructed.Quantum dots (QDs) are small crystalline particles with optical and electrical properties depending on their size. Some of these properties include the band gap excitability, the ability to produce multiple exιtones, photostability, inactivation of the shell and the high absorption coefficient known to reduce the dark current. In addition to their important properties, the lowest cost should also be considered. The QDs can be produced in a variety of shapes and sizes with techniques that provide excellent size control and can be integrated directly into optoelectric devices.The main components of a photoelectrochemical cell are: (a) the anode electrode (photoanode), comprising a wide gap semiconductor, such as titania and the sensitizer, (b) a cathode electrode (counter electrode) comprising a noble metal and (c) the electrolyte containing a suitable redox couple.During this study, the photoanode and counter electrode of the solar cells were both studied. Initially, photoanodes consisting of TiO2 and CdS, CdS-ZnS and CdSe quantum dots were designed and studied in order to investigate the size and spectroscopic behavior of each type of quantum dots separately and then photoelectrodes consisting of combinations of (CdS) CdSe (core) shell quantum were constructed. The stability of these photoelectrodes was also investigated under conditions of actual operation of a photovoltaic cell. These conditions, such as exposure to strong light, atmosphere, weather conditions, etc. cause aging and possibly alteration of the original properties and characteristics of the electrodes. Subsequently, the effect of TiO2 structure in the photoelectrode sensitized with CdS-ZnS/CdSe/ZnS quantum dots was studied. The aim of the design and optimization of mesoporous TiO2 film was to increase the deposited quantity of quantum dots, to reduce the electron path to TiO2 and to inhibit the charge recombination. For further improving the efficiency of solar cells, the reaction for the synthesis of CdSe quantum dots has been optimized. With respect to the cathode electrode, a series of materials, consisting of cobalt sulfide and copper sulphide (CoS-CuS) in various precursors ratios, were utilized for the electrochemical production and characterization of new composite counter electrodes electrochemistry. Finally, for further optimizing the counter electrode, a series of nanohybrid materials consisting of GO with Cu and Co were synthesized. After their synthesis, they have been fully characterized and the effect of the metal quantity on the…

Subjects/Keywords: Ηλιακά κελιά κβαντικών τελειών; Quantum dot sensitised solar cells

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Givalou, L. (2017). Μελέτη και παρασκευή ηλεκτροχημικών συστημάτων και εφαρμογές τους σε φωτοβολταϊκά. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/42601

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Givalou, Lida. “Μελέτη και παρασκευή ηλεκτροχημικών συστημάτων και εφαρμογές τους σε φωτοβολταϊκά.” 2017. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed March 07, 2021. http://hdl.handle.net/10442/hedi/42601.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Givalou, Lida. “Μελέτη και παρασκευή ηλεκτροχημικών συστημάτων και εφαρμογές τους σε φωτοβολταϊκά.” 2017. Web. 07 Mar 2021.

Vancouver:

Givalou L. Μελέτη και παρασκευή ηλεκτροχημικών συστημάτων και εφαρμογές τους σε φωτοβολταϊκά. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2017. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10442/hedi/42601.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Givalou L. Μελέτη και παρασκευή ηλεκτροχημικών συστημάτων και εφαρμογές τους σε φωτοβολταϊκά. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2017. Available from: http://hdl.handle.net/10442/hedi/42601

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Deakin University

3. Rajmohan, Gayathri Devi. Investigation of the potential of plasma technology to improve the performance of solar cells.

Degree: 2015, Deakin University

URL: http://hdl.handle.net/10536/DRO/DU:30079098

► This study explored plasma techniques to improve the efficiency of dye sensitised solar cells and perovskite solar cells. It was found that plasma functionalization of… (more)

Subjects/Keywords: dye sensitised solar cells; perovskite solar cells.; plasma functionalization; TiO2

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rajmohan, G. D. (2015). Investigation of the potential of plasma technology to improve the performance of solar cells. (Thesis). Deakin University. Retrieved from http://hdl.handle.net/10536/DRO/DU:30079098

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rajmohan, Gayathri Devi. “Investigation of the potential of plasma technology to improve the performance of solar cells.” 2015. Thesis, Deakin University. Accessed March 07, 2021. http://hdl.handle.net/10536/DRO/DU:30079098.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rajmohan, Gayathri Devi. “Investigation of the potential of plasma technology to improve the performance of solar cells.” 2015. Web. 07 Mar 2021.

Vancouver:

Rajmohan GD. Investigation of the potential of plasma technology to improve the performance of solar cells. [Internet] [Thesis]. Deakin University; 2015. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10536/DRO/DU:30079098.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rajmohan GD. Investigation of the potential of plasma technology to improve the performance of solar cells. [Thesis]. Deakin University; 2015. Available from: http://hdl.handle.net/10536/DRO/DU:30079098

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Oxford

4. Davis, Nicola Kathleen Sybille. Anthracene-fused porphyrins.

Degree: PhD, 2011, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:86b0efea-d33a-42e2-9304-82d94e8f895a ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558322

► This thesis describes the synthesis of a novel family of porphyrins fused to anthracenes, together with investigations into their optical and electrochemical properties, as well… (more)

▼ This thesis describes the synthesis of a novel family of porphyrins fused to anthracenes, together with investigations into their optical and electrochemical properties, as well as exploring their potential for application in dye-sensitised solar cells. Chapter 1 gives an overview of the structure-property relationships of large planar pi- systems for organic electronic applications. Porphyrins are introduced as suitable building blocks for such systems, and approaches for extending the pi-conjugation of these macrocycles are presented. A literature review of porphyrins fused to aromatic units is presented in Chapter 2, with a focus on the influence of structure on the optoelectronic properties of such systems. The chapter concludes with a summary of my previous work on the synthesis of anthracene-fused porphyrins, and the aims of this project are stated. Chapter 3 describes the syntheses of fully and partially fused bis-anthracene porphyrin monomers and dimers. By varying peripheral substituents, it was possible to solve problems of aggregation encountered for these systems. Fusion of anthracene units to a porphyrin core was found to result in systems displaying strong absorption in the near-IR, small HOMO-LUMO gaps, and low oxidation potentials. Chapter 4 explores the synthesis, crystal structure and optoelectronic properties of a porphyrin fused to four anthracenes, revealing this system to exhibit the longest wavelength absorption of any porphyrin monomer. The synthesis of a liquid crystalline tetra-anthracene-fused porphyrin was proposed, and attempts to synthesise the necessary anthracene precursors were undertaken. Chapter 5 describes the molecular design and synthetic pathway to a mono-anthracene fused porphyrin, and its unfused analogue, for use in liquid electrolyte dye-sensitised solar cells. By varying the metal oxide layer or lithium ion concentration of the device, it was possible to achieve incident photon to current conversion efficiency (IPCE) responses at wavelengths beyond 1050 nm. Chapter 6 details the experimental synthetic procedures and characterisation data for all the compounds synthesised during this project.

Subjects/Keywords: 547.593; Organic chemistry : anthracene : porphyrin : dye sensitised solar cells

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Davis, N. K. S. (2011). Anthracene-fused porphyrins. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:86b0efea-d33a-42e2-9304-82d94e8f895a ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558322

Chicago Manual of Style (16^th Edition):

Davis, Nicola Kathleen Sybille. “Anthracene-fused porphyrins.” 2011. Doctoral Dissertation, University of Oxford. Accessed March 07, 2021. http://ora.ox.ac.uk/objects/uuid:86b0efea-d33a-42e2-9304-82d94e8f895a ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558322.

MLA Handbook (7^th Edition):

Davis, Nicola Kathleen Sybille. “Anthracene-fused porphyrins.” 2011. Web. 07 Mar 2021.

Vancouver:

Davis NKS. Anthracene-fused porphyrins. [Internet] [Doctoral dissertation]. University of Oxford; 2011. [cited 2021 Mar 07]. Available from: http://ora.ox.ac.uk/objects/uuid:86b0efea-d33a-42e2-9304-82d94e8f895a ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558322.

Council of Science Editors:

Davis NKS. Anthracene-fused porphyrins. [Doctoral Dissertation]. University of Oxford; 2011. Available from: http://ora.ox.ac.uk/objects/uuid:86b0efea-d33a-42e2-9304-82d94e8f895a ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558322

Indian Institute of Science

5. Sharmila, S. Studies On Fabrication And Characterisation Of TiO2 Based Dye-Sensitised Solar Cells.

Degree: MSc Engg, Faculty of Engineering, 2017, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2639

► Photovoltaic cells are a promising solution to the current energy crisis. Among the different photovoltaic cell technologies developed, dye-sensitised solar cells (DSSC) are emerging as… (more)

Subjects/Keywords: Solar Cells; Dye Sensitised Solar Cells (DSSC); Photovoltaic Cells; TiO2 Dye Sensitised Solar Cells; Solar Cell Characterization; Solar Cell Fabrication; Thin Film Solar Cells; Dye-sensitized Solar Cells; Electronics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sharmila, S. (2017). Studies On Fabrication And Characterisation Of TiO2 Based Dye-Sensitised Solar Cells. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2639

Chicago Manual of Style (16^th Edition):

Sharmila, S. “Studies On Fabrication And Characterisation Of TiO2 Based Dye-Sensitised Solar Cells.” 2017. Masters Thesis, Indian Institute of Science. Accessed March 07, 2021. http://etd.iisc.ac.in/handle/2005/2639.

MLA Handbook (7^th Edition):

Sharmila, S. “Studies On Fabrication And Characterisation Of TiO2 Based Dye-Sensitised Solar Cells.” 2017. Web. 07 Mar 2021.

Vancouver:

Sharmila S. Studies On Fabrication And Characterisation Of TiO2 Based Dye-Sensitised Solar Cells. [Internet] [Masters thesis]. Indian Institute of Science; 2017. [cited 2021 Mar 07]. Available from: http://etd.iisc.ac.in/handle/2005/2639.

Council of Science Editors:

Sharmila S. Studies On Fabrication And Characterisation Of TiO2 Based Dye-Sensitised Solar Cells. [Masters Thesis]. Indian Institute of Science; 2017. Available from: http://etd.iisc.ac.in/handle/2005/2639

University of the Western Cape

6. Cummings, Franscious Riccardo. TiO₂ nanotube based dye-sensitised solar cells .

Degree: 2012, University of the Western Cape

URL: http://hdl.handle.net/11394/4376

► The first report of a functioning photo-electrochemical solar cell in 1991 attracted a lot of interest from scientists and industrial groups. From an industrial point… (more)

▼ The first report of a functioning photo-electrochemical solar cell in 1991 attracted a lot of interest from scientists and industrial groups. From an industrial point of view these so-called dye-sensitised solar cells (DSCs) offered the promise of moderate efficiency devices at ultra-low costs, owing to simple processing methods and the use of inexpensive materials. From an academic viewpoint, DSCs raised important scientific questions around the fundamental processes governing their operation and how these processes influence the photon-to-electron conversion efficiency of the cell. Major successes have since been achieved in understanding these processes, however the conversion efficiency of the best manufactured DSCs remains around 11%, significantly lower than that of their silicon photovoltaic counterparts. In traditional DSCs, charge generation is achieved by ultrafast electron injection from a photo-excited ruthenium-based dye molecule into the conduction band of a film of TiO₂ nanoparticles, subsequent dye regeneration by an I⁻ /I⁻₃ containing redox electrolyte and finally hole transportation to a platinum-coated counter electrode. The low DSC efficiencies are attributed to scattering of electrons at the interface between two TiO₂ nanoparticles leading to recombination with holes present in the redox electrolyte. Recent studies have shown that the application of films of highly ordered TiO₂ nanotubes instead of nanoparticles has the potential to improve the overall conversion efficiency of the cell. This is ascribed to the one-dimensional nature of nanotubes, which provides a linear transportation route for electrons generated during operation of the DSC. As a result the recombination probability of the electrons with nearby holes in the device is decreased. This work investigated the synthesis of Al₂O₃-coated TiO₂ nanotubes via the anodisation technique for application in DSCs. TiO₂ nanotube arrays with an average length of 15 μm, diameter of 50 nm and wall thickness of 15 nm were synthesised via anodisation using an organic neutral electrolyte consisting of 2 M H₂O + 0.15 M NH₄F + ethylene glycol (EG) at an applied voltage of 60 V for 6 hours. In addition, scanning electron microscope (SEM) micrographs showed that anodisation at these conditions yields nanotubes with smooth walls and hexagonally shaped, closed bottoms. X-ray diffraction (XRD) patterns revealed that the as-anodised nanotubes were amorphous and as such were annealed at 450 °C for 2 hours in air at atmospheric pressure, which yielded crystalline anatase TiO₂ nanotubes. Highresolution transmission electron microscope (TEM) images revealed that the nanotube walls comprised of individual nano-sized TiO₂ crystallites. Photoluminescence (PL) spectroscopy showed that the optical properties, especially the bandgap of the TiO₂ nanotubes are dependent on the crystallinity, which in turn was dependent on the structural characteristics, such as the wall thickness, diameter and length. The PL measurements were supplemented by Raman spectra, which… Advisors/Committee Members: Knoesen, D (advisor).

Subjects/Keywords: Dye-sensitised solar cells; Photovoltaics; Electrochemical anodisation; Renewable energy; Core-shell nanostructures; Materials science

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cummings, F. R. (2012). TiO₂ nanotube based dye-sensitised solar cells . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/4376

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cummings, Franscious Riccardo. “TiO₂ nanotube based dye-sensitised solar cells .” 2012. Thesis, University of the Western Cape. Accessed March 07, 2021. http://hdl.handle.net/11394/4376.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cummings, Franscious Riccardo. “TiO₂ nanotube based dye-sensitised solar cells .” 2012. Web. 07 Mar 2021.

Vancouver:

Cummings FR. TiO₂ nanotube based dye-sensitised solar cells . [Internet] [Thesis]. University of the Western Cape; 2012. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11394/4376.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cummings FR. TiO₂ nanotube based dye-sensitised solar cells . [Thesis]. University of the Western Cape; 2012. Available from: http://hdl.handle.net/11394/4376

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Edinburgh

7. Hewat, Tracy Elizabeth. Exploring copper(I) and ruthenium(II) dyes for their use in dye-sensitised solar cells.

Degree: PhD, 2013, University of Edinburgh

URL: http://hdl.handle.net/1842/17075

► Dye design is one of the most important and challenging areas in dye-sensitised solar cell research. The purpose of the work in this thesis is… (more)

▼ Dye design is one of the most important and challenging areas in dye-sensitised solar cell research. The purpose of the work in this thesis is to synthesise and characterise novel ruthenium(II) and copper(I) dyes that will provide insight into the number of binding groups required and the potential use of chromophoric ligands. A series of four simple Ru(II) dyes have been synthesised with the general formula Ru(4,4’- (R)-bipyridine)2(NCS)2 where R represents CH3 or CO2H. The study investigates the number of acid groups required to successfully bind to TiO2 whilst maintaining efficient charge injection. The series consists of one acid group, two acids, two acids on adjacent bipyridines, and three acids groups. Dye uptake was studied via optical waveguide spectroscopy, providing information on dye diffusion, adsorption and desorption kinetics, and surface coverage. Interestingly, the two acid groups on adjacent ligands suggested poor/slow binding to TiO2 surface and a high degree of dye aggregation in comparison to two acid groups on the same ligand. The dye with three binding groups showed strong adsorption to TiO2 and better dye coverage, resulting in a high efficiency. The complexes were all fully characterised by electrochemistry, photoluminescence, absorption spectroscopy, DFT calculations and solar cell performance testing. To date, there has been limited exploration of copper(I) complexes as potential alternatives to ruthenium(II) sensitisers, with even fewer publications reported for Cu(I) heteroleptic species. The neutral complexes that were synthesised are of the general formula: Cu(4,4’- (R)-6,6’-(CH3)-bipyridine)(β-diketonate) and Cu(4,4’-(R)-6,6’-(CH3)-bipyridine)(dipyrrin) where R represents CH3 or CO2Et. Additional blocking groups on the ligands are introduced to minimise structural change during oxidation or MLCT excitation. Improved stability and reproducibility have been shown for complexes containing the dipyrrin ligand, likely due to better steric constraints and better π-overlap with the bipyridine. There has also been a remarkable improvement in light absorption, from 450 nm to 600 nm. In-situ solar studies have been carried out on the Cu(4,4’-(R)-6,6’-(CH3)-bipyridine)(dipyrrin) series and a 0.41% efficiency has been achieved. Computational studies supports the experimental data in which the main transition appears to be ligand centred (dipyrrin) with a small MLCT contribution.

Subjects/Keywords: 621.31; dye-sensitised solar cell research; ruthenium(II) dye; copper(I) dye; chromophoric ligands; MLCT

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hewat, T. E. (2013). Exploring copper(I) and ruthenium(II) dyes for their use in dye-sensitised solar cells. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/17075

Chicago Manual of Style (16^th Edition):

Hewat, Tracy Elizabeth. “Exploring copper(I) and ruthenium(II) dyes for their use in dye-sensitised solar cells.” 2013. Doctoral Dissertation, University of Edinburgh. Accessed March 07, 2021. http://hdl.handle.net/1842/17075.

MLA Handbook (7^th Edition):

Hewat, Tracy Elizabeth. “Exploring copper(I) and ruthenium(II) dyes for their use in dye-sensitised solar cells.” 2013. Web. 07 Mar 2021.

Vancouver:

Hewat TE. Exploring copper(I) and ruthenium(II) dyes for their use in dye-sensitised solar cells. [Internet] [Doctoral dissertation]. University of Edinburgh; 2013. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1842/17075.

Council of Science Editors:

Hewat TE. Exploring copper(I) and ruthenium(II) dyes for their use in dye-sensitised solar cells. [Doctoral Dissertation]. University of Edinburgh; 2013. Available from: http://hdl.handle.net/1842/17075

University of Cambridge

8. Bin Kamarudin, Muhammad Akmal. Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells.

Degree: PhD, 2018, University of Cambridge

URL: https://doi.org/10.17863/CAM.17215 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744441

► This thesis examines the electro-optic, electric and electrochemical properties of liquid crystal (LC) materials in self-assembly systems, that is, liquid crystal-polymer electrolyte composites (LC-PEs), LC… (more)

▼ This thesis examines the electro-optic, electric and electrochemical properties of liquid crystal (LC) materials in self-assembly systems, that is, liquid crystal-polymer electrolyte composites (LC-PEs), LC binary mixtures, and their potential application in dye-sensitised solar cells (DSSCs). The birefringence of LCs causes light modulation, which can be controlled by an applied voltage and electric field. In particular, the LCs are used as one of the components for the electrolyte redox couple which is responsible for charge transfer mechanism in DSSCs. In this work, LC-PEs were developed by dissolving LCs in polymer electrolytes; using a homologous series of cyanobiphenyls in a range of concentrations, alkyl chain lengths and dielectric permittivities. We found that doping the polymer electrolyte with 15% 4'-cyano-4'-pentylbiphenyl (5CB) improved ionic conductivity by up to 13 % compared to pure polymer electrolyte. Materials with positive dielectric permittivity and shorter alkyl chain length have been identified to be compatible with iodide/triiodide (I^-/I_3^-)-based polymer electrolytes. In DSSCs, 15% 5CB and 15% E7 LC-PEs exhibited the best efficiencies of 3.6 % and 4.0 %, respectively. In addition to LC-PEs, the self-assembly properties of smectic phase LCs were also utilised as templates for controlling the polymer structure in polymer electrolytes. A porous polymer network was prepared using various techniques including self-assembly, by applying an electric field and using a polyimide (PI) alignment layer. We found that the electrochemical and photovoltaic properties of these materials strongly correlated to the morphology/structure with the self-assembled structure, thus showing the best photovoltaic performance (5.9 %) even when compared with a reference solar cell (4.97 %). Finally, this thesis explores the interaction of LCs with graphene (Gr) in DSSC device architectures. Gr-based DSSCs were fabricated using different processing conditions, with the result being that Gr improved the performance of the DSSCs. The highest efficiency obtained was 5.48 % compared to the 4.86 % of a reference DSSC. The incorporation of LC-PEs in Gr-based DSSCs improved the performance of DSSCs was observed in devices with low concentrations of LCs due to the Gr inducing planar alignment of LCs. These results suggest a new strategy to improve DSSC efficiency by incorporating LC materials in the polymer electrolyte component. Even though these LCs are highly insulating, their self-assembly and dielectric polarisability help enhance ionic conductivity and optical scattering when doped into polymer electrolytes. This work can be extended in a fundamental way to elucidate the ionic conduction mechanism of LC-based electrolyte systems. Furthermore, it would be interesting if the benefits of using LC-PEs and smectic-templated polymer electrolytes (Sm-Pes) can be translated further in commercial electrochemical energy conversion systems.

Subjects/Keywords: 548; Liquid Crystals; Dye-sensitised Solar Cells; Self-assembled soft matter; Graphene

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bin Kamarudin, M. A. (2018). Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.17215 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744441

Chicago Manual of Style (16^th Edition):

Bin Kamarudin, Muhammad Akmal. “Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells.” 2018. Doctoral Dissertation, University of Cambridge. Accessed March 07, 2021. https://doi.org/10.17863/CAM.17215 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744441.

MLA Handbook (7^th Edition):

Bin Kamarudin, Muhammad Akmal. “Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells.” 2018. Web. 07 Mar 2021.

Vancouver:

Bin Kamarudin MA. Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Mar 07]. Available from: https://doi.org/10.17863/CAM.17215 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744441.

Council of Science Editors:

Bin Kamarudin MA. Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.17215 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744441

Queensland University of Technology

9. Rasin, Ahmed Tasnim. High efficiency quantum dot-sensitised solar cells by material science and device architecture.

Degree: 2014, Queensland University of Technology

URL: https://eprints.qut.edu.au/78822/

► This thesis studied cadmium sulfide and cadmium selenide quantum dots and their performance as light absorbers in quantum dot-sensitised solar cells. This research has made… (more)

Subjects/Keywords: Solar Cells; Quantum Dot; Photovoltaic; Quantum Dot-sensitised Solar Cells; Solution-processed Photovoltaic; Photodegradation; Passivation; Shell coating; Quantum confinement; Surface coverage

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rasin, A. T. (2014). High efficiency quantum dot-sensitised solar cells by material science and device architecture. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/78822/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rasin, Ahmed Tasnim. “High efficiency quantum dot-sensitised solar cells by material science and device architecture.” 2014. Thesis, Queensland University of Technology. Accessed March 07, 2021. https://eprints.qut.edu.au/78822/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rasin, Ahmed Tasnim. “High efficiency quantum dot-sensitised solar cells by material science and device architecture.” 2014. Web. 07 Mar 2021.

Vancouver:

Rasin AT. High efficiency quantum dot-sensitised solar cells by material science and device architecture. [Internet] [Thesis]. Queensland University of Technology; 2014. [cited 2021 Mar 07]. Available from: https://eprints.qut.edu.au/78822/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rasin AT. High efficiency quantum dot-sensitised solar cells by material science and device architecture. [Thesis]. Queensland University of Technology; 2014. Available from: https://eprints.qut.edu.au/78822/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Oxford

10. Tiwana, Priti. Ultrafast charge dynamics in mesoporous materials used in dye-sensitized solar cells.

Degree: PhD, 2013, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:ba3cbbce-3119-4043-a499-c0ca74287d42 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588439

► This thesis is concerned with measuring ultrafast electron dynamics taking place in dye-sensitized mesoporous semiconductor films employed as working electrodes in dye-sensitized solar cells (DSCs).… (more)

▼ This thesis is concerned with measuring ultrafast electron dynamics taking place in dye-sensitized mesoporous semiconductor films employed as working electrodes in dye-sensitized solar cells (DSCs). An understanding of these ultrafast charge transfer mechanisms is essential for designing efficient photovoltaic (PV) devices with high photon-to-current conversion efficiency. Optical-pump terahertz-probe (OPTP) spectroscopy is a sub-picosecond resolution, non-contact, photoconductivity measurement technique which can be used to directly measure charge carrier dynamics within nanostructured materials without the need for invoking complex modelling schemes. A combination of OPTP and photovoltaic measurements on mesoporous TiO2 films show an early-time intra-particle electron mobility of 0.1 cm2/(Vs). This value is an order of magnitude lower than that measured in bulk TiO2 and can be partly explained by the restricted electron movement because of geometrical constraints and increased trap sites in the nanostructured material. In addition, the mesoporous film behaves like a nanostructured composite material, with the TiO2 nanoparticles embedded in a low dielectric medium (air or vacuum), leading to lower apparent electron mobility. THz mobility measured in similar mesoporous ZnO and SnO2 films sensitized with the same dye is calculated to be 0.17 cm2/(Vs) for ZnO and 1.01 cm2/(Vs) for SnO2. Possible reasons for the deviation from mobilities reported in literature for the respective bulk materials have been discussed. The conclusion of this study is that while electron mobility values for nanoporous TiO2 films are approaching theoretical maximum values, both intra- and inter-particle electron mobility in mesoporous ZnO and SnO2 films offer considerable scope for improvement. OPTP has also been used to measure electron injection rates in dye-sensitized TiO2, ZnO and SnO2 nanostructured films. They are seen to proceed in the order TiO2 >SnO2 >ZnO. While the process is complete within a few picoseconds in TiO2/Z907, it is seen to extend beyond a nanosecond in case of ZnO. These measurements correlate well with injection efficiencies determined from DSCs fabricated from identical mesoporous films, suggesting that the slow injection components limit the overall solar cell photocurrent. The reasons for this observed difference in charge injection rates have been explored within. It is now fairly common practice in the photovoltaic community to apply a coating of a wide band-gap material over the metal-oxide nanoparticles in DSCs to improve device performance. However, the underlying reasons for the improvement are not fully understood. With this motivation, OPTP spectroscopy has been used to study how the conformal coating affects early-time mechanisms, such as electron injection, trapping or diffusion length. The electron injection process is unaffected in case of TiCl4-treated TiO2 and MgO-treated ZnO, while it becomes much slower in case of MgO-treated SnO2. Finally, a light-soaking effect observed in SnO2-based solid-state…

Subjects/Keywords: 621.31244; Optoelectronics; Condensed Matter Physics; Laser Spectroscopy; Nanomaterials; dye-sensitised solar cells; 3rd generation solar cells; ultrafast photophysics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tiwana, P. (2013). Ultrafast charge dynamics in mesoporous materials used in dye-sensitized solar cells. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:ba3cbbce-3119-4043-a499-c0ca74287d42 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588439

Chicago Manual of Style (16^th Edition):

Tiwana, Priti. “Ultrafast charge dynamics in mesoporous materials used in dye-sensitized solar cells.” 2013. Doctoral Dissertation, University of Oxford. Accessed March 07, 2021. http://ora.ox.ac.uk/objects/uuid:ba3cbbce-3119-4043-a499-c0ca74287d42 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588439.

MLA Handbook (7^th Edition):

Tiwana, Priti. “Ultrafast charge dynamics in mesoporous materials used in dye-sensitized solar cells.” 2013. Web. 07 Mar 2021.

Vancouver:

Tiwana P. Ultrafast charge dynamics in mesoporous materials used in dye-sensitized solar cells. [Internet] [Doctoral dissertation]. University of Oxford; 2013. [cited 2021 Mar 07]. Available from: http://ora.ox.ac.uk/objects/uuid:ba3cbbce-3119-4043-a499-c0ca74287d42 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588439.

Council of Science Editors:

Tiwana P. Ultrafast charge dynamics in mesoporous materials used in dye-sensitized solar cells. [Doctoral Dissertation]. University of Oxford; 2013. Available from: http://ora.ox.ac.uk/objects/uuid:ba3cbbce-3119-4043-a499-c0ca74287d42 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588439

Loughborough University

11. Mat-Teridi, Mohd. Construction of photosensitised semiconductor cathodes.

Degree: PhD, 2012, Loughborough University

URL: http://hdl.handle.net/2134/10286

► Recent studies suggest that the performance of dye-sensitised solar cells (DSC) has appeared to have reached a limit, therefore solar cells based on semiconductor materials,… (more)

▼ Recent studies suggest that the performance of dye-sensitised solar cells (DSC) has appeared to have reached a limit, therefore solar cells based on semiconductor materials, such as extremely thin absorber (ETA) solar cells and tandem solar cells are currently the subject of intense research in the framework of low-cost photovoltaic devices as sources of harvesting sunlight to generate electricity. Generally, semiconductor solar cells have been divided into two different types, namely anodic and cathodic type solar cells. Extensive research and development work has been focused on anodic semiconductor sensitised solar cells to date. In contrast, the cathodic semiconductor sensitised solar cells have received no attention which is very surprising. Developing the cathodic semiconductor sensitised solar cell concept is very important in the development of tandem solar cells as well as other new solar cell configurations. The main reason for the lack of research in this area was due to the rarity of p-type semiconductor materials, which made it difficult to find suitable materials to match the energy band edges for cathodic semiconductor sensitised solar cells (CSSC) as well as solid-state cathodic semiconductor solar cells (SS-CSSC). The primary aim of this thesis was to construct cathodic semiconductor sensitised solar cells as well as their solid-state analogues (SS-CSSC). The work conducted within this doctoral study presents state-of-art materials and thin film processing/preparation methods, their characterisation and developing CSSCs and SS-CSSCs employing such films in cascade configurations. No reports have been published in the literature on SS-CSSC to date. The first stage of this thesis is focused on optimising the morphology and the texture (porosity) of the CuI and NiO semiconductor photocathode, by the introduction of new deposition methods namely, pulsed-electrodeposition (PED) and Aerosol-Assisted Deposition (AAD) and Aerosol-Assisted Chemical Vapour Deposition (AACVD). The electrodes prepared by employing the methods mentioned above and controlling the deposition parameters systematically, we have achieved significant improvement in the film morphology and the texture of the deposited films. The resulting electrodes showed excellent improvement in the photoelectrochemical performance which made it suitable for application in construction of both CSSC and SS-CSSC. The photoelectrochemical performance of the electrodes can be seen clearly through the photocurrent density data. For the case of bare CuI, the PEC performance of electrode prepared by the AAD and PED compared against that of continuous-electrodeposition (ED) electrodes. The photocurrent density achieved for the electrodes prepared by AAD and PED was reported around 175 and 75 µAcm-2 respectively which are way higher than the ED case. At the second stage of this study, the work focused on fabrication and characterisation of the CSSCs. Cathodic sensitised PEC solar cells (CuI/Cu2S/(Eu2+/Eu3+) and NiO/Cu2S/(I3-/I-)) were fabricated by deposition…

Subjects/Keywords: 621.31; Solar cells; ETA solar cells; Dye sensitised solar cells; P-type solar cells; Semiconductor and tandem solar cells

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mat-Teridi, M. (2012). Construction of photosensitised semiconductor cathodes. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/10286

Chicago Manual of Style (16^th Edition):

Mat-Teridi, Mohd. “Construction of photosensitised semiconductor cathodes.” 2012. Doctoral Dissertation, Loughborough University. Accessed March 07, 2021. http://hdl.handle.net/2134/10286.

MLA Handbook (7^th Edition):

Mat-Teridi, Mohd. “Construction of photosensitised semiconductor cathodes.” 2012. Web. 07 Mar 2021.

Vancouver:

Mat-Teridi M. Construction of photosensitised semiconductor cathodes. [Internet] [Doctoral dissertation]. Loughborough University; 2012. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/2134/10286.

Council of Science Editors:

Mat-Teridi M. Construction of photosensitised semiconductor cathodes. [Doctoral Dissertation]. Loughborough University; 2012. Available from: http://hdl.handle.net/2134/10286

University of the Western Cape

12. le Roux, Lukas Johannes. The effects of reverse bias on the efficiency of dye solar cells .

Degree: 2009, University of the Western Cape

URL: http://hdl.handle.net/11394/2684

► Dye-sensitised solar cells (DSC) have attracted much attention during the last few years due to their high efficiencies and their potentially low production costs. The… (more)

▼ Dye-sensitised solar cells (DSC) have attracted much attention during the last few years due to their high efficiencies and their potentially low production costs. The technology is based on a thin layer of nano sized, high band gap (3.2 eV) TiO2 film. A Ru containing dye (from hereon called the Ru dye) is chemisorbed onto the TiO2 film. This combination acts as the working electrode. The counter electrode consists of a platinum layer which is the catalyst for the regeneration of the Iodine/Iodide electrolyte. The work that is presented here is focused on the results that were obtained during studies of the performance of the DSC under certain reverse bias conditions. When one cell in the series connection in a module is shaded, the current will pass this cell in reverse bias. In such a case the shaded cell will be subjected to a voltage in the reverse direction coming from the other lit cells in the module. This reverse voltage could permanently modify or damage the cell if it is not properly protected. Although the work is focussed on the chemical stability of the dye, various techniques were employed to determine the physical changes in the cell. It was found that a cell that was subjected to a reverse bias of 2 V for 500 min showed a 58% recovery and a cell that was subjected to 4.5 V reverse bias was irreversibly damaged. The UV-vis spectra showed a blue shift (higher energy), the Raman showed no peak at 1713 cm-1 (which indicates the absence of free carboxylate groups) and the FT-IR showed the disappearance of the NC-S absorption band at 2100 cm-1. The combined conclusion is that the - NCS ligand has been depleted and replaced with I3- ions. When measuring the impedance, the Nyquist plots showed an increase in the charge transfer resistance at the counter electrode when subjected to a reverse bias potential of 2 V. This is confirmed by the Bode plots. This indicates a partial oxidation of the Pt catalyst on the counter electrode. It can therefore be stated with confidence that the changes in the cell after being subjected to a reverse bias potential of 2 V for 500 min are changes on the -NCS bonds on the Ru dye as well as the Pt in the counter electrode. Advisors/Committee Members: Hietkamp, Sibbele (advisor), Knoesen, Dirk (advisor).

Subjects/Keywords: Dye solar cells; Dye-sensitised solar cells; Dye application

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

le Roux, L. J. (2009). The effects of reverse bias on the efficiency of dye solar cells . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/2684

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

le Roux, Lukas Johannes. “The effects of reverse bias on the efficiency of dye solar cells .” 2009. Thesis, University of the Western Cape. Accessed March 07, 2021. http://hdl.handle.net/11394/2684.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

le Roux, Lukas Johannes. “The effects of reverse bias on the efficiency of dye solar cells .” 2009. Web. 07 Mar 2021.

Vancouver:

le Roux LJ. The effects of reverse bias on the efficiency of dye solar cells . [Internet] [Thesis]. University of the Western Cape; 2009. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11394/2684.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

le Roux LJ. The effects of reverse bias on the efficiency of dye solar cells . [Thesis]. University of the Western Cape; 2009. Available from: http://hdl.handle.net/11394/2684

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Canterbury

13. Chen, Linda Yen-Chien. Fabrication of Dye Sensitized Solar Cells on Pre-textured Substrates.

Degree: M. Eng., Electrical Engineering, 2010, University of Canterbury

URL: http://dx.doi.org/10.26021/2363

► Dye Sensitized Solar Cells (DSSC) possesses huge potential in solar energy utilisation and immense research has been carried out in order to improve its performance.… (more)

Subjects/Keywords: dye sensitised solar cell; photovoltaic; nanofabrication; pre-textured

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, L. Y. (2010). Fabrication of Dye Sensitized Solar Cells on Pre-textured Substrates. (Masters Thesis). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/2363

Chicago Manual of Style (16^th Edition):

Chen, Linda Yen-Chien. “Fabrication of Dye Sensitized Solar Cells on Pre-textured Substrates.” 2010. Masters Thesis, University of Canterbury. Accessed March 07, 2021. http://dx.doi.org/10.26021/2363.

MLA Handbook (7^th Edition):

Chen, Linda Yen-Chien. “Fabrication of Dye Sensitized Solar Cells on Pre-textured Substrates.” 2010. Web. 07 Mar 2021.

Vancouver:

Chen LY. Fabrication of Dye Sensitized Solar Cells on Pre-textured Substrates. [Internet] [Masters thesis]. University of Canterbury; 2010. [cited 2021 Mar 07]. Available from: http://dx.doi.org/10.26021/2363.

Council of Science Editors:

Chen LY. Fabrication of Dye Sensitized Solar Cells on Pre-textured Substrates. [Masters Thesis]. University of Canterbury; 2010. Available from: http://dx.doi.org/10.26021/2363

RMIT University

14. Evangelista, R. Performance enhancement of quantum dot sensitised solar cells through enhanced interfacial charge transfer kinetics.

Degree: 2019, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:162714

► There is a plethora of renewable energy sources that wait for us to be harnessed - wind, geothermal, wave, solar energies, to name a few… (more)

▼ There is a plethora of renewable energy sources that wait for us to be harnessed - wind, geothermal, wave, solar energies, to name a few - which are more than enough to supply our energy demand. The sun, with its enormous amount of free energy at 3 x 10²⁴ Joules/year, is estimated to be capable of covering 10,000 times the world's energy requirement at the beginning of the 21st century. The most common method of harvesting solar energy is through photovoltaic (PV) technology in which next-generation PV technologies are vastly becoming popular due to limitations in the mainstream solar PVs i.e. Silicon-based solar PVs. One of these next-generation PVs is the quantum dot sensitised solar cell (QDSSC), the focus in this thesis. Quantum dots (QD) which are semiconductor nanomaterials used as sensitiser in QDSSCs, are physically very small in size, usually below 10 nm. Because of this minuteness the QD's optical and electronic properties differ from those of its bulk material's properties, such that it will absorb/emit light usually from the visible to infrared wavelength in the solar spectrum. In addition, these properties can be controlled by tuning the parameters during synthesis, opening up a number of applications in biotechnology, electronics, photovoltaics, and quantum computing. This thesis focuses on the photovoltaic application of QDs specifically investigating the liquid junction QDSSC. There have been previous studies focusing on the components such as electrode, sensitiser, counter-electrode, and limited studies on electrolyte. The aim of this thesis is thus to understand how the concentration of the redox electrolyte affects kinetics and dynamics of electrons at the interfaces of the CdS QDSSC which was achieved by: • reviewing previous and current works on the enhancement of QDSSC conversion efficiency and studies on QDs. • advancing the understanding of the interfacial charge transfer kinetics in a CdS QDSSC based on aqueous Fe(CN)6^4-/Fe(CN)6^3- electrolyte. • analysing the effects of varying concentrations of the reduced (Fe(CN)6^4-) and oxidised (Fe(CN)6^3-) species in a ferrocyanide/ferricyanide electrolyte on the performance of a CdS QDSSC. • identifying the most influential factors on the output of a CdS QDSSC using the Matlab software for optimised fitting of a theoretical vs. experimental voltage-current curve based on the diode model. • disseminating the results of the investigation conducted via publication in peer-reviewed journals. The main research questions addressed in this thesis are: • What are the alternative ways of controlling and handling QDs and how these handling conditions affect QD's ageing? • How will ferrocyanide/ferricyanide redox electrolyte affect the interfacial charge transfer kinetics in a CdS QDSSC? • What are the optimal reduced and oxidised species concentrations in a ferrocyanide/ferricyanide electrolyte to maximise the performance of a CdS QDSSC? • Which…

Subjects/Keywords: Fields of Research; Semiconductor quantum dot sensitised solar cells; Ferrocyanide/ferricyanide redox couple; CdS; Photovoltage decay; Transient photocurrent; SILAR deposition; Single diode equation; Matlab simulation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Evangelista, R. (2019). Performance enhancement of quantum dot sensitised solar cells through enhanced interfacial charge transfer kinetics. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:162714

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Evangelista, R. “Performance enhancement of quantum dot sensitised solar cells through enhanced interfacial charge transfer kinetics.” 2019. Thesis, RMIT University. Accessed March 07, 2021. http://researchbank.rmit.edu.au/view/rmit:162714.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Evangelista, R. “Performance enhancement of quantum dot sensitised solar cells through enhanced interfacial charge transfer kinetics.” 2019. Web. 07 Mar 2021.

Vancouver:

Evangelista R. Performance enhancement of quantum dot sensitised solar cells through enhanced interfacial charge transfer kinetics. [Internet] [Thesis]. RMIT University; 2019. [cited 2021 Mar 07]. Available from: http://researchbank.rmit.edu.au/view/rmit:162714.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Evangelista R. Performance enhancement of quantum dot sensitised solar cells through enhanced interfacial charge transfer kinetics. [Thesis]. RMIT University; 2019. Available from: http://researchbank.rmit.edu.au/view/rmit:162714

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cambridge

15. Creissen, Charles Eric. Solar Driven Hydrogen Generation with Dye-Sensitised CuCrO2 Photocathodes.

Degree: PhD, 2019, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/294366

► Solar conversion of water into chemical energy carriers offers a sustainable alternative to fossil fuels. Inspired by natural processes, dye-sensitised photoelectrochemical cells provide a platform… (more)

▼ Solar conversion of water into chemical energy carriers offers a sustainable alternative to fossil fuels. Inspired by natural processes, dye-sensitised photoelectrochemical cells provide a platform for H2 generation from water. Fuel-forming photocathodes are currently limited by the small range of wide-bandgap p-type semiconductors available. The majority of previous reports have employed NiO, which displays low performance with immobilised dyes and catalysts, requiring exploration of other metal oxides. In this thesis, CuCrO2 is presented as an alternative p-type semiconductor for dye-sensitised H2 production. Synthesis and characterisation of CuCrO2 using a sol-gel method is described. First, co-immobilisation of a phosphonated diketopyrrolopyrrole dye with a Ni-bis(diphosphine) catalyst on CuCrO2 is presented as a strategy for producing a functional photocathode capable of generating H2 (Chapter 2). Photocurrent analysis and product detection revealed a high turnover number for the catalyst, outperforming an analogous NiO photoelectrode. The study serves to demonstrate the benefits of adopting delafossite structures for dye-sensitised systems. The versatility of sol-gel synthesised CuCrO2 was highlighted through immobilisation of ZnSe nanorods (NRs) (Chapter 3). Ligand-stripped ZnSe-NRs were deposited on CuCrO2 to produce the first reported ZnSe-sensitised photocathode capable of photoelectrochemical proton reduction under solar irradiation. Hydrothermal synthesis of CuCrO2 nanoparticles enabled the development of nanostructured inverse opal electrodes (IO-CuCrO2) using a bottom-up templating method (Chapter 4). These electrodes were explored as a scaffold for solar H2 production together with a molecular Ni catalyst and two different organic dyes based on perylene monoimide and diketopyrrolopyrrole chromophores. Improved activity over the mesoporous CuCrO2 films was associated with the novel morphology of the p-SC and the integration of a more suitable dye for hole injection. Photoelectrochemical analysis and a discussion of the influence of molecular components in these highly proficient electrodes provides a basis for future development of dye-sensitised CuCrO2-based photocathodes.

Subjects/Keywords: Photoelectrochemistry; Solar Fuel; Electrocatalysis; Dye-Sensitised; Photoelectrochemical Cell; Hydrogen; Artificial Photosynthesis; Catalysis; Water Splitting; Photocathode; Proton Reduction; Molecular Catalysis; p-type semiconductor; CuCrO2; Delafossite

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Creissen, C. E. (2019). Solar Driven Hydrogen Generation with Dye-Sensitised CuCrO2 Photocathodes. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/294366

Chicago Manual of Style (16^th Edition):

Creissen, Charles Eric. “Solar Driven Hydrogen Generation with Dye-Sensitised CuCrO2 Photocathodes.” 2019. Doctoral Dissertation, University of Cambridge. Accessed March 07, 2021. https://www.repository.cam.ac.uk/handle/1810/294366.

MLA Handbook (7^th Edition):

Creissen, Charles Eric. “Solar Driven Hydrogen Generation with Dye-Sensitised CuCrO2 Photocathodes.” 2019. Web. 07 Mar 2021.

Vancouver:

Creissen CE. Solar Driven Hydrogen Generation with Dye-Sensitised CuCrO2 Photocathodes. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Mar 07]. Available from: https://www.repository.cam.ac.uk/handle/1810/294366.

Council of Science Editors:

Creissen CE. Solar Driven Hydrogen Generation with Dye-Sensitised CuCrO2 Photocathodes. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://www.repository.cam.ac.uk/handle/1810/294366

University of the Western Cape

16. Cummings, Franscious Riccardo. TiO2 nanotube based dye- sensitised solar cells .

Degree: 2012, University of the Western Cape

URL: http://hdl.handle.net/11394/3311

► This work investigated the synthesis of Al2O3-coated TiO2 nanotubes via the anodisation technique for application in DSCs. TiO2 nanotube arrays with an average length of… (more)

▼ This work investigated the synthesis of Al2O3-coated TiO2 nanotubes via the anodisation technique for application in DSCs. TiO2 nanotube arrays with an average length of 15 μm, diameter of 50 nm and wall thickness of 15 nm were synthesised via anodisation using an organic neutral electrolyte consisting of 2 M H2O + 0.15 M NH4F + ethylene glycol (EG) at an applied voltage of 60 V for 6 hours. In addition, scanning electron microscope (SEM) micrographs showed that anodisation at these conditions yields nanotubes with smooth walls and hexagonally shaped, closed bottoms. X-ray diffraction (XRD) patterns revealed that the as-anodised nanotubes were amorphous and as such were annealed at 450 °C for 2 hours in air at atmospheric pressure, which yielded crystalline anatase TiO2 nanotubes. Highresolution transmission electron microscope (TEM) images revealed that the nanotube walls comprised of individual nano-sized TiO2 crystallites. Photoluminescence (PL) spectroscopy showed that the optical properties, especially the bandgap of the TiO2 nanotubes are dependent on the crystallinity, which in turn was dependent on the structural characteristics, such as the wall thickness, diameter and length. The PL measurements were supplemented by Raman spectra, which revealed an increased in the quantum confinement of the optical phonon modes of the nanotubes synthesised at low anodisation voltages, consequently yielding a larger bandgap The annealed nanotubes were then coated with a thin layer of alumina (Al2O3) using a simple sol-gel dip coating method, effectively used to coat films of nanoparticles. Atomic force microscopy (AFM) showed that the average nanotube diameter increased post sol-gel deposition, which suggests that the nanotubes are coated with a layer of Al2O3. This was confirmed with HR-TEM, in conjunction with selected area electron diffraction (SAED) and XRD analyses, which showed the coating of the nanotube walls with a thin layer of amorphous Al2O3 with a thickness between 4 and 7 nm. Ultraviolet-visible (UVvis) absorbance spectra showed that the dye-adsorption ability of the nanotubes are enhanced by the Al2O3 coating and hence is a viable material for solar cell application. Upon application in the DSC, it was found by means of photo-current density – voltage (I – V) measurements that a DSC fabricated with a 15 μm thick layer of bare TiO2 nanotubes has a photon-to-light conversion efficiency of 4.56%, which increased to 4.88% after coating the nanotubes with a layer of alumina. However, these devices had poorer conversion efficiencies than bare and Al2O3-coated TiO2 nanoparticle based DSCs, which boasted with efficiencies of 6.54 and 7.26%, respectively. The low efficiencies of the TiO2 nanotube based DSCs are ascribed to the low surface area of the layer of nanotubes, which yielded low photocurrent densities. Electrochemical impedance spectroscopy (EIS) showed that the electron lifetime in the alumina coated nanotubes are almost 20 times greater than in a bare layer of nanoparticles. In addition, it was… Advisors/Committee Members: Knoesen, D (advisor).

Subjects/Keywords: Dye-sensitised solar cells; TiO2 nanotube; Photovoltaics; Electrochemical anodisation; Sol-Gel deposition; Renewable energy; Core-shell nanostructures; Materials science; Opto-electronic properties; Morphology; Electron charge transfer; Crystallinity

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cummings, F. R. (2012). TiO2 nanotube based dye- sensitised solar cells . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/3311

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cummings, Franscious Riccardo. “TiO2 nanotube based dye- sensitised solar cells .” 2012. Thesis, University of the Western Cape. Accessed March 07, 2021. http://hdl.handle.net/11394/3311.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cummings, Franscious Riccardo. “TiO2 nanotube based dye- sensitised solar cells .” 2012. Web. 07 Mar 2021.

Vancouver:

Cummings FR. TiO2 nanotube based dye- sensitised solar cells . [Internet] [Thesis]. University of the Western Cape; 2012. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11394/3311.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cummings FR. TiO2 nanotube based dye- sensitised solar cells . [Thesis]. University of the Western Cape; 2012. Available from: http://hdl.handle.net/11394/3311

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Massey University

17. Smalley, Serena Jade. Dipyrrin complexes as dyes for dye-sensitised solar cells : a thesis submitted in partial fulfilment of the requirements for the degree of Masters in Science in Chemistry at Massey University, Palmerston North, New Zealand .

Degree: 2009, Massey University

URL: http://hdl.handle.net/10179/1220

► With increasing concerns of global warming and the impending exhaustion of fossil fuels attention is being turned to renewable sources of energy. The sun supplies… (more)

▼ With increasing concerns of global warming and the impending exhaustion of fossil fuels attention is being turned to renewable sources of energy. The sun supplies 3 x 1024 J per year to the earth which is around 104 times more energy than what the human race consumes. The world’s energy needs would be satisfied if a mere 0.1% of the planet’s surface was covered with solar cells(< = 10%)1, causing the conversion of solar energy (sunlight) into electricity to represent a very practical renewable source. Past research into solar energy has produced a photovoltaic device, which when coupled with highly coloured coordination compounds, enables this conversion. This device is known as a dye-sensitised solar cell (DSSC). Further research has been conducted into the properties of the dyes, and has shown that highly coloured coordination compounds are able to convert solar energy into electrical energy with the highest efficiencies. The dominant compounds in this area to date have been Grätzel’s ruthenium complexes and porphyrins. However, there exists a class of smaller compounds called dipyrrins, described most simply as “half a porphyrin”, which possess many of the attractive qualities for DSSC dyes. Although there are no examples of ruthenium-dipyrrin complexes in the literature, the combination of advantageous properties from both components represent very attractive synthetic targets with huge potential as dyes for DSSCs. The objectives of this thesis were firstly to develop a series of dipyrrin complexes which would be suitable as dyes for DSSCs; then to fully characterise the complexes and investigate the spectroscopic properties of each complex; and finally to determine the suitability of the complexes as dyes for DSSCs. These objectives were fully met, resulting in a set of generic target compounds characterised via 1H NMR, 13C NMR, mass spectrometry (ESI-MS), elemental analysis, and x-ray crystallography. From analyses of the UV-visible, fluorescence, emission, and Raman spectra; and electrochemistry results; the complexes were concluded to be suitable as dyes for DSSC’s. An additional bonus is that the syntheses for these complexes are applicable to any dipyrrin, thus aiding future studies into the use of dipyrrins as dyes for DSSC’s. This thesis summarises the findings of the above outlined research project.

Subjects/Keywords: Dye-sensitised solar cells; Dipyrrin complexes; Photovoltaic devices; DSSC dyes

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Smalley, S. J. (2009). Dipyrrin complexes as dyes for dye-sensitised solar cells : a thesis submitted in partial fulfilment of the requirements for the degree of Masters in Science in Chemistry at Massey University, Palmerston North, New Zealand . (Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/1220

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Smalley, Serena Jade. “Dipyrrin complexes as dyes for dye-sensitised solar cells : a thesis submitted in partial fulfilment of the requirements for the degree of Masters in Science in Chemistry at Massey University, Palmerston North, New Zealand .” 2009. Thesis, Massey University. Accessed March 07, 2021. http://hdl.handle.net/10179/1220.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Smalley, Serena Jade. “Dipyrrin complexes as dyes for dye-sensitised solar cells : a thesis submitted in partial fulfilment of the requirements for the degree of Masters in Science in Chemistry at Massey University, Palmerston North, New Zealand .” 2009. Web. 07 Mar 2021.

Vancouver:

Smalley SJ. Dipyrrin complexes as dyes for dye-sensitised solar cells : a thesis submitted in partial fulfilment of the requirements for the degree of Masters in Science in Chemistry at Massey University, Palmerston North, New Zealand . [Internet] [Thesis]. Massey University; 2009. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10179/1220.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Smalley SJ. Dipyrrin complexes as dyes for dye-sensitised solar cells : a thesis submitted in partial fulfilment of the requirements for the degree of Masters in Science in Chemistry at Massey University, Palmerston North, New Zealand . [Thesis]. Massey University; 2009. Available from: http://hdl.handle.net/10179/1220

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cambridge

18. Creissen, Charles Eric. Solar driven hydrogen generation with dye-sensitised CuCrO2 photocathodes.

Degree: PhD, 2019, University of Cambridge

URL: https://doi.org/10.17863/CAM.41467 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782911

► Solar conversion of water into chemical energy carriers offers a sustainable alternative to fossil fuels. Inspired by natural processes, dye-sensitised photoelectrochemical cells provide a platform… (more)

▼ Solar conversion of water into chemical energy carriers offers a sustainable alternative to fossil fuels. Inspired by natural processes, dye-sensitised photoelectrochemical cells provide a platform for H2 generation from water. Fuel-forming photocathodes are currently limited by the small range of wide-bandgap p-type semiconductors available. The majority of previous reports have employed NiO, which displays low performance with immobilised dyes and catalysts, requiring exploration of other metal oxides. In this thesis, CuCrO2 is presented as an alternative p-type semiconductor for dye-sensitised H2 production. Synthesis and characterisation of CuCrO2 using a sol-gel method is described. First, co-immobilisation of a phosphonated diketopyrrolopyrrole dye with a Ni-bis(diphosphine) catalyst on CuCrO2 is presented as a strategy for producing a functional photocathode capable of generating H2 (Chapter 2). Photocurrent analysis and product detection revealed a high turnover number for the catalyst, outperforming an analogous NiO photoelectrode. The study serves to demonstrate the benefits of adopting delafossite structures for dye-sensitised systems. The versatility of sol-gel synthesised CuCrO2 was highlighted through immobilisation of ZnSe nanorods (NRs) (Chapter 3). Ligand-stripped ZnSe-NRs were deposited on CuCrO2 to produce the first reported ZnSe-sensitised photocathode capable of photoelectrochemical proton reduction under solar irradiation. Hydrothermal synthesis of CuCrO2 nanoparticles enabled the development of nanostructured inverse opal electrodes (IO-CuCrO2) using a bottom-up templating method (Chapter 4). These electrodes were explored as a scaffold for solar H2 production together with a molecular Ni catalyst and two different organic dyes based on perylene monoimide and diketopyrrolopyrrole chromophores. Improved activity over the mesoporous CuCrO2 films was associated with the novel morphology of the p-SC and the integration of a more suitable dye for hole injection. Photoelectrochemical analysis and a discussion of the influence of molecular components in these highly proficient electrodes provides a basis for future development of dye-sensitised CuCrO2-based photocathodes.

Subjects/Keywords: Photoelectrochemistry; Solar Fuel; Electrocatalysis; Dye-Sensitised; Photoelectrochemical Cell; Hydrogen; Artificial Photosynthesis; Catalysis; Water Splitting; Photocathode; Proton Reduction; Molecular Catalysis; p-type semiconductor; CuCrO2; Delafossite

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Creissen, C. E. (2019). Solar driven hydrogen generation with dye-sensitised CuCrO2 photocathodes. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.41467 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782911

Chicago Manual of Style (16^th Edition):

Creissen, Charles Eric. “Solar driven hydrogen generation with dye-sensitised CuCrO2 photocathodes.” 2019. Doctoral Dissertation, University of Cambridge. Accessed March 07, 2021. https://doi.org/10.17863/CAM.41467 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782911.

MLA Handbook (7^th Edition):

Creissen, Charles Eric. “Solar driven hydrogen generation with dye-sensitised CuCrO2 photocathodes.” 2019. Web. 07 Mar 2021.

Vancouver:

Creissen CE. Solar driven hydrogen generation with dye-sensitised CuCrO2 photocathodes. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Mar 07]. Available from: https://doi.org/10.17863/CAM.41467 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782911.

Council of Science Editors:

Creissen CE. Solar driven hydrogen generation with dye-sensitised CuCrO2 photocathodes. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://doi.org/10.17863/CAM.41467 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782911

19. Bin Kamarudin, Muhammad Akmal. Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells.

Degree: PhD, 2018, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/270351

► This thesis examines the electro-optic, electric and electrochemical properties of liquid crystal (LC) materials in self-assembly systems, that is, liquid crystal-polymer electrolyte composites (LC-PEs), LC… (more)

▼ This thesis examines the electro-optic, electric and electrochemical properties of liquid crystal (LC) materials in self-assembly systems, that is, liquid crystal-polymer electrolyte composites (LC-PEs), LC binary mixtures, and their potential application in dye-sensitised solar cells (DSSCs). The birefringence of LCs causes light modulation, which can be controlled by an applied voltage and electric field. In particular, the LCs are used as one of the components for the electrolyte redox couple which is responsible for charge transfer mechanism in DSSCs. In this work, LC-PEs were developed by dissolving LCs in polymer electrolytes; using a homologous series of cyanobiphenyls in a range of concentrations, alkyl chain lengths and dielectric permittivities. We found that doping the polymer electrolyte with 15% 4'-cyano-4'-pentylbiphenyl (5CB) improved ionic conductivity by up to 13 % compared to pure polymer electrolyte. Materials with positive dielectric permittivity and shorter alkyl chain length have been identified to be compatible with iodide/triiodide (I^-/I_3^-)-based polymer electrolytes. In DSSCs, 15% 5CB and 15% E7 LC-PEs exhibited the best efficiencies of 3.6 % and 4.0 %, respectively. In addition to LC-PEs, the self-assembly properties of smectic phase LCs were also utilised as templates for controlling the polymer structure in polymer electrolytes. A porous polymer network was prepared using various techniques including self-assembly, by applying an electric field and using a polyimide (PI) alignment layer. We found that the electrochemical and photovoltaic properties of these materials strongly correlated to the morphology/structure with the self-assembled structure, thus showing the best photovoltaic performance (5.9 %) even when compared with a reference solar cell (4.97 %). Finally, this thesis explores the interaction of LCs with graphene (Gr) in DSSC device architectures. Gr-based DSSCs were fabricated using different processing conditions, with the result being that Gr improved the performance of the DSSCs. The highest efficiency obtained was 5.48 % compared to the 4.86 % of a reference DSSC. The incorporation of LC-PEs in Gr-based DSSCs improved the performance of DSSCs was observed in devices with low concentrations of LCs due to the Gr inducing planar alignment of LCs. These results suggest a new strategy to improve DSSC efficiency by incorporating LC materials in the polymer electrolyte component. Even though these LCs are highly insulating, their self-assembly and dielectric polarisability help enhance ionic conductivity and optical scattering when doped into polymer electrolytes. This work can be extended in a fundamental way to elucidate the ionic conduction mechanism of LC-based electrolyte systems. Furthermore, it would be interesting if the benefits of using LC-PEs and smectic-templated polymer electrolytes (Sm-Pes) can be translated further in commercial electrochemical energy conversion systems.

Subjects/Keywords: Liquid Crystals; Dye-sensitised Solar Cells; Self-assembled soft matter; Graphene

…propylimidizolium iodide DSC Differential scanning calorimetry DSSC Dye-sensitised solar cell E… …of liquid crystalpolymer composite electrolyte in graphene-based dye-sensitised solar cells… …sensitised solar cells: effects of mesophase alkyl chain length.” Liquid Crystals, 2017, 1-10. M. A… …PDLCs in dye-sensitised solar cells (DSSCs), which has substantially improved the…

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bin Kamarudin, M. A. (2018). Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/270351

Chicago Manual of Style (16^th Edition):

Bin Kamarudin, Muhammad Akmal. “Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells.” 2018. Doctoral Dissertation, University of Cambridge. Accessed March 07, 2021. https://www.repository.cam.ac.uk/handle/1810/270351.

MLA Handbook (7^th Edition):

Bin Kamarudin, Muhammad Akmal. “Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells.” 2018. Web. 07 Mar 2021.

Vancouver:

Bin Kamarudin MA. Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Mar 07]. Available from: https://www.repository.cam.ac.uk/handle/1810/270351.

Council of Science Editors:

Bin Kamarudin MA. Integration of liquid crystals with redox electrolytes in dye-sensitised solar cells. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://www.repository.cam.ac.uk/handle/1810/270351

Indian Institute of Science

20. Anju, V G. Electrocatalysis using Ceramic Nitride and Oxide Nanostructures.

Degree: PhD, Faculty of Science, 2017, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2919

► Global warming and depletion in fossil fuels have forced the society to search for alternate, clean sustainable energy sources. An obvious solution to the aforesaid… (more)

▼ Global warming and depletion in fossil fuels have forced the society to search for alternate, clean sustainable energy sources. An obvious solution to the aforesaid problem lies in electrochemical energy storage systems like fuel cells and batteries. The desirable properties attributed to these devices like quick response, long life cycle, high round trip efficiency, clean source, low maintenance etc. have made them very attractive as energy storage devices. Compared to many advanced battery chemistries like nickel-metal hydride and lithium - ion batteries, metal-air batteries show several advantages like high energy density, ease of operation etc. The notable characteristics of metal - air batteries are the open structure with oxygen gas accessed from ambient air in the cathode compartment. These batteries rely on oxygen reduction and oxygen evolution reactions during discharging and charging processes. The efficiency of these systems is determined by the kinetics of oxygen reduction reaction. Platinum is the most preferred catalyst for many electrochemical reactions. However, high cost and stability issues restrict the use of Pt and hence there is quest for the development of stable, durable and active electrocatalysts for various redox reactions. The present thesis is directed towards exploring the electrocatalytic aspects of titanium carbonitride. TiCN, a fascinating material, possesses many favorable properties such as extreme hardness, high melting point, good thermal and electrical conductivity. Its metal-like conductivity and extreme corrosion resistance prompted us to use this material for various electrochemical studies. The work function as well as the bonding in the material can be tuned by varying the composition of carbon and nitrogen in the crystal lattice. The current study explores the versatility of TiCN as electrocatalyst in aqueous and non-aqueous media. One dimensional TiC0.7N0.3 nanowires are prepared by simple one step solvothermal method without use of any template and are characterized using various physicochemical techniques. The 1D nanostructures are of several µm size length and 40 ± 15 nm diameter (figure 1). Orientation followed by attachment of the primary particles results in the growth along a particular plane (figure 2). (a) (b) (c) Figure 1. (a) SEM images of TiC0.7N0.3 nanowires (b) TEM image and (c) High resolution TEM image showing the lattice fringes. (a) (b) (d) Figure 2. Bright field TEM images obtained at different time scales of reaction. (a) 0 h; (b) 12 h; (c) 72 h and (d) 144 h. The next aspect of the thesis discusses the electrochemical performance of TiC0.7N0.3 especially for oxygen reduction. Electrochemical oxygen reduction reaction (ORR) reveals that the nanowires possess high activity for ORR and involves four electron process leading to water as the product. The catalyst effectively converts oxygen to water with an efficiency of 85%. A comparison of the activity of different (C/N) compositions of TiCN is shown in figure 3. The composition TiC0.7N0.3 shows… Advisors/Committee Members: Sampath, Srinivasan (advisor).

Subjects/Keywords: Electrocatalysis; Oxide Nanostructures; Ceramic Nitrides; Titanium Carbonitride (TiCN); Metal-Air Batteries; Dye Sensitised Solar Cells; Aqueous Air Batteries; Oxygen Reduction Reaction Catalysts; Oxygen Evolution Reaction Catalysts; Nickel Titanate ((NiTiO3); Electrochemistry; Zinc-Air Batteries; Lithium-Air Batteries; Magnesium-Air Batteries; Zinc-air Battery; TiN Nanotubes; Inorganic Chemistry

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Anju, V. G. (2017). Electrocatalysis using Ceramic Nitride and Oxide Nanostructures. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2919

Chicago Manual of Style (16^th Edition):

Anju, V G. “Electrocatalysis using Ceramic Nitride and Oxide Nanostructures.” 2017. Doctoral Dissertation, Indian Institute of Science. Accessed March 07, 2021. http://etd.iisc.ac.in/handle/2005/2919.

MLA Handbook (7^th Edition):

Anju, V G. “Electrocatalysis using Ceramic Nitride and Oxide Nanostructures.” 2017. Web. 07 Mar 2021.

Vancouver:

Anju VG. Electrocatalysis using Ceramic Nitride and Oxide Nanostructures. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2017. [cited 2021 Mar 07]. Available from: http://etd.iisc.ac.in/handle/2005/2919.

Council of Science Editors:

Anju VG. Electrocatalysis using Ceramic Nitride and Oxide Nanostructures. [Doctoral Dissertation]. Indian Institute of Science; 2017. Available from: http://etd.iisc.ac.in/handle/2005/2919

Uppsala University

21. Hedbor, Sigrid. Plant Extract Sensitised Nanoporous TiO2 Thin Film Photoelectrochemical Cells.

Degree: Earth Sciences, 2005, Uppsala University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88885

►

För att undersöka skillnad i prestationsförmåga mellan celler sensiterade med växtextraktsbaserad färg, och celler sensiterademed ruteniumkomplex-baserad färg, samt huruvida presskraften påverkar en cells prestationsförmåga,… (more)

▼

För att undersöka skillnad i prestationsförmåga mellan celler sensiterade med växtextraktsbaserad färg, och celler sensiterademed ruteniumkomplex-baserad färg, samt huruvida presskraften påverkar en cells prestationsförmåga, tillverkades icke-slutna fotoelektrokemiska färg-sensiterade solceller med tunnfilmsfotoelektroder av pressad, nanoporös titandioxid. Cellerna pressades med tre olika presskrafter och sensiterades med växtextraktsfärg från rödkål, rödbeta, viol och henna, samt en ruteniumkomplex-baserad färg som fick utgöra kontrollbetingelse. För varje cell uppmättes IPCE- och iV-värde och motsvarande fyllnadsgrad (fill factor) och dessa jämfördes. Ingen signifikant skillnad kunde fastställas mellan celler pressade med olika presstryck. Bland cellerna sensiterade med växtextraktbaserad färg presterade rödbeta bäst. Cellen med högst effektivitet hade fyllnadsgraden 70%. Emellertid uppvisade de växtfärgade cellerna genomgående sämre effektivitet än de rutenium-sensiterade och fotoströmmarna var mycket låga. IPCE-värdena var allmännt låga: den bäst presterande cellen hade ett IPCE-värde på något över 0,06 i våglängdsintervallet 440-470 nm. En förklaring till detta är de övriga ämnen som förutom pigment återfinns i de växtbaserade färgerna. Dessa hindrar pigmentmättnad och förhindrar att växtfärgen når ruteniumfärgens intensitet. En annan anledning består i svårigheten att passa ihop energinivåerna i cellens elektrolyt-halvledarsystem med energinivåerna hos pigmentet i växtfärgen.

Non-sealed photoelectrochemical dye sensitised solar cells (DSSC) with pressed nanoporous TiO2 thin film photoelectrodes were manufactured for the purposes of finding out whether plant extractbased dye sensitised cells can perform as well as ruthenium complex-based dye sensitised cells and whether the pressing force affects the cell performance. The cells were pressed with three different pressing forces and sensitised with plant extracts from red cabbage, beetroot, violet and henna, as well as with a ruthenium complex-based dye for comparison. The IPCE and iV values and the corresponding fill factors of the cells were evaluated and compared. No significant difference between the cells pressed with different pressing forces could be established. Among the plant extract-based dye sensitised cells the ones sensitised with beetroot extract performed best. The cell that achieved the highest efficiency had a fill factor of 70%. Compared to the ruthenium-sensitised cells the overall performance of the plant dye sensitised cells were very poor and the produced photocurrents very low. The IPCE values were generally low: one of the best-performing cells had an IPCE value of slightly over 0.06 in the 440-470 nm wavelength ranges. One reason for this is that it is difficult to obtain a plant extract dye as intense and deep in colour as ruthenium complex-based dyes, since pigment saturation is obstructed by the presence of other chemical compounds in the plant extracts. Another is that it is a delicate and…

Subjects/Keywords: photoelectrochemical cell; solar cell; nanoporous; thin film; titanium dioxide; dye sensitised; ruthenium; plant extract; beetroot.; TECHNOLOGY; TEKNIKVETENSKAP

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hedbor, S. (2005). Plant Extract Sensitised Nanoporous TiO2 Thin Film Photoelectrochemical Cells. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88885

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hedbor, Sigrid. “Plant Extract Sensitised Nanoporous TiO2 Thin Film Photoelectrochemical Cells.” 2005. Thesis, Uppsala University. Accessed March 07, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88885.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hedbor, Sigrid. “Plant Extract Sensitised Nanoporous TiO2 Thin Film Photoelectrochemical Cells.” 2005. Web. 07 Mar 2021.

Vancouver:

Hedbor S. Plant Extract Sensitised Nanoporous TiO2 Thin Film Photoelectrochemical Cells. [Internet] [Thesis]. Uppsala University; 2005. [cited 2021 Mar 07]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88885.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hedbor S. Plant Extract Sensitised Nanoporous TiO2 Thin Film Photoelectrochemical Cells. [Thesis]. Uppsala University; 2005. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88885

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

22. Bharwal, Anil. Cellules solaires à colorant tout solide composées d'une électrode de TiO2 à porosité hiérarchisée et d'un électrolyte polyliquides ioniques à matrice polysiloxane : Hierarchical porous TiO2 and ionic liquid-like polysiloxane electrolyte for solid state-Dye-Sensitized Solar Cells.

Degree: Docteur es, Matériaux, Mécanique, Génie civil, Electrochimie, 2018, Université Grenoble Alpes (ComUE); Université de Liège. Faculté des Sciences

URL: http://www.theses.fr/2018GREAI007

►

DSSC est une technologie photovoltaïque de 3ème génération avec un fort potentiel économiquement et une efficacité importante de conversion des photons en électricité. Le DSSC… (more)

▼

DSSC est une technologie photovoltaïque de 3ème génération avec un fort potentiel économiquement et une efficacité importante de conversion des photons en électricité. Le DSSC à l'état solide à base d'électrolyte polymère solide prévient la perte et l'évaporation du solvant pendant la fabrication et le fonctionnement des cellules, ce qui prolongera efficacement la durée de vie de la cellule. Cependant, il souffre d'une faible conductivité ionique et d'une faible infiltration des pores.La présente thèse est dédiée au développement concomitant d'électrolytes polymères à base de polysiloxane d'un côté et de photoanodes TiO2 à porosité controlée de l'autre côté et leur incorporation dans des cellules solaires contrastants à l'état solide (ss-DSSC), dans le but d'améliorer leur efficacité photovoltaïque et la stabilité à long terme. À notre connaissance, les DSSC comprenant des couches de TiO2 bimodales et des électrolytes de polysiloxane n'ont jamais été rapportés.La conductivité ionique et le coefficient de diffusion des tri-iodures des liquides poly (ioniques) (PILs) à base de polysiloxane ont été largement améliorés par addition de liquides ioniques (ILs) ou de carbonate d'éthylène (EC), conduisant à des conductivités ioniques de l'ordre de 10-4 -10-3 Scm-1. Les DSSC fabriqués avec les électrolytes optimisés ont montré des rendements jusqu'à 6%, avec une stabilité à long terme pendant 250 jours.Des films de TiO2 bimodaux à double porosité (méso et macroporosité) ont été fabriqués par revêtement par centrifugation, en utilisant des modèles mous et durs. Les films à double matrice bénéficient d'une taille de pores accrue tout en maintenant une surface spécifique élevée pour l'adsorption de colorant. Les films bimodaux se sont révélés plus efficaces lorsqu'ils ont été testés avec des électrolytes polymères, ayant des efficacités comparables avec l'électrolyte liquide dans les DSSC, malgré une absorption plus faible de colorant.Cette thèse apporte une contribution significative dans le domaine des DSSC en tant que cellules solaires efficaces et stables qui ont été préparés à partir d'électrolytes polymères et de films bimodaux nouvellement synthétisés.

DSSC is a 3rd generation photovoltaic technology with potential to economically harvest and efficiently convert photons to electricity. Full solid state-DSSC based on solid polymer electrolyte prevents the solvent leaking and evaporation during cell fabrication and operation, which will effectively prolong the cell life time. However, it suffers from low ionic conductivity and poor pore infiltration.The present thesis is dedicated to the concomitant development of polysiloxane-based polymer electrolytes on one side, and TiO2 photoanodes with tuned porosity on the other side, and their incorporation in solid state dye sensitised solar cell (ss-DSSCs), with the aim to improve their photovoltaic efficiency and the long term stability. To best of our knowledge, DSSCs comprising bimodal TiO2 layers and polysiloxane electrolytes have never been reported.The ionic conductivity…

Advisors/Committee Members: Alloin, Fannie (thesis director), Iojoiu, Cristina (thesis director), Henrist, Catherine (thesis director).

Subjects/Keywords: Colorant cellule solaire sensibilisée; Électrolyte polymère; TiO2 mésoporeux; Polyliquides ioniques; Polysiloxane; La stabilité; Solid State Dye sensitised Solar cell; Semi solid polymer electolyte; Mesoporous TiO2; Poly(ionic) liquid; Polysiloxane; Stability; 620

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bharwal, A. (2018). Cellules solaires à colorant tout solide composées d'une électrode de TiO2 à porosité hiérarchisée et d'un électrolyte polyliquides ioniques à matrice polysiloxane : Hierarchical porous TiO2 and ionic liquid-like polysiloxane electrolyte for solid state-Dye-Sensitized Solar Cells. (Doctoral Dissertation). Université Grenoble Alpes (ComUE); Université de Liège. Faculté des Sciences. Retrieved from http://www.theses.fr/2018GREAI007

Chicago Manual of Style (16^th Edition):

Bharwal, Anil. “Cellules solaires à colorant tout solide composées d'une électrode de TiO2 à porosité hiérarchisée et d'un électrolyte polyliquides ioniques à matrice polysiloxane : Hierarchical porous TiO2 and ionic liquid-like polysiloxane electrolyte for solid state-Dye-Sensitized Solar Cells.” 2018. Doctoral Dissertation, Université Grenoble Alpes (ComUE); Université de Liège. Faculté des Sciences. Accessed March 07, 2021. http://www.theses.fr/2018GREAI007.

MLA Handbook (7^th Edition):

Bharwal, Anil. “Cellules solaires à colorant tout solide composées d'une électrode de TiO2 à porosité hiérarchisée et d'un électrolyte polyliquides ioniques à matrice polysiloxane : Hierarchical porous TiO2 and ionic liquid-like polysiloxane electrolyte for solid state-Dye-Sensitized Solar Cells.” 2018. Web. 07 Mar 2021.

Vancouver:

Bharwal A. Cellules solaires à colorant tout solide composées d'une électrode de TiO2 à porosité hiérarchisée et d'un électrolyte polyliquides ioniques à matrice polysiloxane : Hierarchical porous TiO2 and ionic liquid-like polysiloxane electrolyte for solid state-Dye-Sensitized Solar Cells. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); Université de Liège. Faculté des Sciences; 2018. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2018GREAI007.

Council of Science Editors:

Bharwal A. Cellules solaires à colorant tout solide composées d'une électrode de TiO2 à porosité hiérarchisée et d'un électrolyte polyliquides ioniques à matrice polysiloxane : Hierarchical porous TiO2 and ionic liquid-like polysiloxane electrolyte for solid state-Dye-Sensitized Solar Cells. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); Université de Liège. Faculté des Sciences; 2018. Available from: http://www.theses.fr/2018GREAI007

University of Melbourne

23. DKHISSI, YASMINA DELPHINE. Solid-state thin films solar cells on polymer substrates.

Degree: 2015, University of Melbourne

URL: http://hdl.handle.net/11343/56579

► To meet the world’s ever-growing energy needs while facing current environmental challenges, solid-state thin film solar cells offer a low-cost renewable alternative for generating electricity.… (more)

▼ To meet the world’s ever-growing energy needs while facing current environmental challenges, solid-state thin film solar cells offer a low-cost renewable alternative for generating electricity. Polymer substrates give thin films lightweight and flexibility, broadening their potential applications to consumer electronics and power-generating textiles. The use of solution processable materials on flexible substrates paves the way towards roll-to-roll printing of photovoltaics, taking advantage of available, low-cost manufacturing technologies. However, constructing efficient solar devices on plastic substrates remains difficult due to the substrate’s intrinsic low-temperature limitation. Furthermore, the stability of thin films needs to be addressed in order for them to become viable candidates for commercial applications. In the first research Chapter, volatile liquid electrolytes were replaced with composite polymer electrolytes to improve the stability of dye-sensitized solar cells (DSCs). On one hand, the infiltration of viscous electrolytes through the TiO2 working electrode was suspected to constitute a major limitation to producing efficient flexible devices. On the other hand, the temperature restriction of polymer substrates prevented the sintering of mesoporous TiO2 directly onto these substrates. Therefore, submicrometer-sized mesoporous TiO2 beads, that can be treated prior to the device fabrication, were investigated as a potential route to overcome the aforementioned issues. Efficient quasi-solid-state DSCs were successfully fabricated on plastic substrates, and studies on the infiltration of the electrolyte through the electrode were conducted. Then, efforts were focused on photovoltaics utilizing inorganic-organic perovskites, an emerging technology with reported efficiencies rivalling existing commercial solar cell technologies. Solution processed, these hybrid materials can be prepared at low temperature, thus becoming a potential candidate for application to polymer substrates. Nevertheless, the majority of these solid-state devices constructed on glass employ a high temperature processed inorganic hole blocking layer (≥450 °C), non-compatible with flexible applications. In this regard, efforts were directed towards the development of methods to fabricate efficient flexible solid-state perovskite devices on polymer substrates with a range of low-temperature processed hole blocking layers. As a result of the moisture and temperature sensitivity of these hybrid perovskites, a perovskite deposition method was developed and optimized, in order to improve the reproducibility of these devices. In Chapter 4, power conversion efficiencies (PCEs) over 13 % were attained for TiO2-based flexible planar perovskite devices, with an average efficiency of 11.8 ± 1.8 %. In Chapter 5, ZnO was chosen as an electron selective material given its advantages for printing, and PCEs over 10 % were achieved for spin-coated ZnO-based perovskite solar cells on polymer substrates. Exacerbated degradation of CH3NH3PbI3…

Subjects/Keywords: dye-sensitised solar cells; dye-sensitized solar cells; quasi-solid-state; gel electrolyte; perovskite solar cells; solid-state; thin films; metal oxide; low temperature; low-cost; photovoltaics; flexible; polymer substrates; stability; degradation; encapsulation; solution processing; titania; zinc oxide; CH3NH3PbI3; spiro-MeOTAD; nanoparticles; colloids

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

DKHISSI, Y. D. (2015). Solid-state thin films solar cells on polymer substrates. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/56579

Chicago Manual of Style (16^th Edition):

DKHISSI, YASMINA DELPHINE. “Solid-state thin films solar cells on polymer substrates.” 2015. Doctoral Dissertation, University of Melbourne. Accessed March 07, 2021. http://hdl.handle.net/11343/56579.

MLA Handbook (7^th Edition):

DKHISSI, YASMINA DELPHINE. “Solid-state thin films solar cells on polymer substrates.” 2015. Web. 07 Mar 2021.

Vancouver:

DKHISSI YD. Solid-state thin films solar cells on polymer substrates. [Internet] [Doctoral dissertation]. University of Melbourne; 2015. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11343/56579.

Council of Science Editors:

DKHISSI YD. Solid-state thin films solar cells on polymer substrates. [Doctoral Dissertation]. University of Melbourne; 2015. Available from: http://hdl.handle.net/11343/56579

University of Bath

24. Peic, Antun. Mesoporous thin-film materials studied by optical waveguide spectroscopy.

Degree: PhD, 2009, University of Bath

URL: https://researchportal.bath.ac.uk/en/studentthesis/mesoporous-thinfilm-materials-studied-by-optical-waveguide-spectroscopy(c9faf1f0-c31c-4c05-8879-bef2c106ca50).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518293

► A method was developed to access the interior of light-guiding structures in order to exploit the enhanced sensing potential of the highly confined electromagnetic field… (more)

Subjects/Keywords: 530.417; dye sensitised solar cell; optical waveguide spectroscopy; dielectric properties; dye coverage; dye adsorption

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Peic, A. (2009). Mesoporous thin-film materials studied by optical waveguide spectroscopy. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/mesoporous-thinfilm-materials-studied-by-optical-waveguide-spectroscopy(c9faf1f0-c31c-4c05-8879-bef2c106ca50).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518293

Chicago Manual of Style (16^th Edition):

Peic, Antun. “Mesoporous thin-film materials studied by optical waveguide spectroscopy.” 2009. Doctoral Dissertation, University of Bath. Accessed March 07, 2021. https://researchportal.bath.ac.uk/en/studentthesis/mesoporous-thinfilm-materials-studied-by-optical-waveguide-spectroscopy(c9faf1f0-c31c-4c05-8879-bef2c106ca50).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518293.

MLA Handbook (7^th Edition):

Peic, Antun. “Mesoporous thin-film materials studied by optical waveguide spectroscopy.” 2009. Web. 07 Mar 2021.

Vancouver:

Peic A. Mesoporous thin-film materials studied by optical waveguide spectroscopy. [Internet] [Doctoral dissertation]. University of Bath; 2009. [cited 2021 Mar 07]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/mesoporous-thinfilm-materials-studied-by-optical-waveguide-spectroscopy(c9faf1f0-c31c-4c05-8879-bef2c106ca50).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518293.

Council of Science Editors:

Peic A. Mesoporous thin-film materials studied by optical waveguide spectroscopy. [Doctoral Dissertation]. University of Bath; 2009. Available from: https://researchportal.bath.ac.uk/en/studentthesis/mesoporous-thinfilm-materials-studied-by-optical-waveguide-spectroscopy(c9faf1f0-c31c-4c05-8879-bef2c106ca50).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518293

25. Mailer, Alastair George. Colloidal cluster phases and solar cells.

Degree: PhD, 2012, University of Edinburgh

URL: http://hdl.handle.net/1842/7651

► The arrangement of soft materials through solution processing techniques is a topic of profound importance for next generation solar cells; the resulting morphology has a… (more)

▼ The arrangement of soft materials through solution processing techniques is a topic of profound importance for next generation solar cells; the resulting morphology has a major influence on construction, performance and lifetime. This thesis investigates the connections between the soft matter physics of colloidal systems and solid state dye sensitised (SSDS) and bulk heterojunction (BHJ) solar cells. A study of aqueous titanium dioxide nanoparticulate suspensions was carried out in order to observe how suspension structure can be controlled by altering the inter-colloid potential via pH-induced electrostatic charging. Measurements were performed at volume fractions between 0.025% and 8.2% with the solution pH set to 3.1, 3.5 or 4.5 before mixing. Suspensions with a volume fraction above 4% formed self-supporting gels regardless of the set pre-mix pH. These gels displayed shear thinning behaviour with a power law exponent of 0.8, a yield stress of 11(1) Pa and rheological response consistent with an aggregated fractal network. At lower volume fractions, suspensions exhibited consolidation interpreted as the collapse of a gel of fractal clusters with a fractal dimension of 2.36. The velocity of the suspension/supernatant interface exhibited delayed sedimentation behaviour, as well as further fractal-based power law scalings with volume fraction. Lower volume fraction suspensions were explored using dynamic light scattering. Limited aggregation of ‘stable’ suspensions was observed when compared to primary aggregate radii measured from electron microscopy images. To connect suspension structure and cell manufacture, the behaviour of more concentrated suspensions was observed during the drying of thin films, a process which forms an essential part of a SSDS solar cell. Lowering the pH of the suspension after mixing from 4 to 3 resulted in an ordering of observed crack domains. An increase in film delamination was also observed. Rates of mass loss during drying followed the expected three phase process, although there was an unexpected increase in rate during the initial phase (where rate is usually constant in time). Dynamic light scattering was found to be a useful but demanding technique for studying cluster formation in titanium dioxide suspensions. A non-linear fitting technique utilising the method of moments was thoroughly explored using computer simulated datasets. The algorithm reduced the systematic error in fitted parameters for moderately polydisperse (0:2 < < 0:4) datasets as compared to the commonly applied linear algorithm. The fitting algorithm was also robust to bad initial estimates of parameters. Finally, test solar cells have been built using blends of titanium dioxide and poly-3-hexylthiophene. Device performance was reduced with blend standing time after mixing but could be improved by remixing the blend before spin coating, implicating a reversible process (e.g. aggregation of titanium dioxide or crystallisation of P3HT) in the loss of performance. Addition of a titanium dioxide hole blocking layer…

Subjects/Keywords: 621.31; soft condensed matter; dye sensitised solar cell; bulk heterojunction; colloidal gelation

…towards completed cells. The Dye Sensitised Solar Cell (DSSC) concept emerged [75… …dye and the need to incorporate as much sensitised interface per unit volume as possible…

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mailer, A. G. (2012). Colloidal cluster phases and solar cells. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/7651

Chicago Manual of Style (16^th Edition):

Mailer, Alastair George. “Colloidal cluster phases and solar cells.” 2012. Doctoral Dissertation, University of Edinburgh. Accessed March 07, 2021. http://hdl.handle.net/1842/7651.

MLA Handbook (7^th Edition):

Mailer, Alastair George. “Colloidal cluster phases and solar cells.” 2012. Web. 07 Mar 2021.

Vancouver:

Mailer AG. Colloidal cluster phases and solar cells. [Internet] [Doctoral dissertation]. University of Edinburgh; 2012. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1842/7651.

Council of Science Editors:

Mailer AG. Colloidal cluster phases and solar cells. [Doctoral Dissertation]. University of Edinburgh; 2012. Available from: http://hdl.handle.net/1842/7651

University of Otago

26. Horvath, Raphael. A Photophysical Investigation of d6 Metal Polypyridyl Complexes .

Degree: 2012, University of Otago

URL: http://hdl.handle.net/10523/2599

► A number of polypyridyl complexes based on d6 metals have been investigated using a range of spectroscopic and computational techniques. Interest in these systems stems… (more)

▼ A number of polypyridyl complexes based on d6 metals have been investigated using a range of spectroscopic and computational techniques. Interest in these systems stems from potential applications in molecule based devices, such as dye sensitised solar cells, as well as the potential to gain insight into fundamental photophysical properties of metal complexes and the development of techniques to probe these. Several techniques have been used and are described. The ground states of complexes have been characterised using FT-IR and FT-Raman spectroscopic techniques, which allow for verification of observable quantities obtained from density functional theory calculations. Electronic absorption and resonance Raman allow the initially excited state to be investigated, while transient absorption and transient and time resolved resonance Raman are sensitive toward excited states with the longest lifetimes. Picosecond time resolved infrared is used to bridge this gap, to provide a comprehensive description of processes post initial photoexcitation. Chapter 3 involves discussion of N3, a commonly used dye for dye sensitised solar cells, and derivatives thereof. Derivatisation was carried out to enhance the solar absorption properties of the dyes; however, it was found that the acceptor molecular orbitals do not extend over the attached units in the absorbing state. Time resolved infrared spectroscopy was carried out to probe the excited state, which showed, for an anthrylethenyl-substituted complex, an unusual charge-separated excited state based on a single ligand. In Chapters 4 and 7, investigations on complexes based on the ligand 2,2’;6’,2”-terpyridine, including multimetallic assemblies, are described. The terpyridine allows for the constructions of linear structures; however, corresponding metal complexes possess short lifetimes. Replacing two carbon of this ligand with nitrogen gives 2,6-di-2-pyridyl-1,3,5-triazine, which imbues the corresponding ruthenium complexes with extended lifetimes. Resonance Raman spectroscopy was able to show predominant population of the triazine-containing ligand when the complex is excited in the visible region. The ability of multimetallic assemblies comprised of similar ligands to quench excited state populations was probed. To that end, transient absorption and time resolved resonance Raman spectroscopic techniques have been used to show that initially populated excited state electrons return to the ground state by interacting with attached secondary metal subunits. In Chapters 5 and 6, the effects of substitution of electron donating units on well studied complexes of the ligands 2,2’-bipyridine and dipyrido[3,2-a:2’,3’-c]phenazine are investigated. Rhenium complexes of these ligands show unusual excited states that are thought to originate from the electron donating properties of the substituents. The bipyridine complexes, substituted with ethenyl-linked diphenylaniline, possess an intraligand charge transfer reaction that exists without contribution from the metal; these are… Advisors/Committee Members: Gordon, Keith C (advisor).

Subjects/Keywords: Raman; rhenium; ruthenium; bipyridine; terpyridine; dppz; polypyridyl; triplet state calculation; DFT; TD-DFT; N3; transient absorption; transient emission; time resolved resonance Raman; time resolved infrared; infrared; excited state dynamics; dye sensitised solar cell; metal to ligand charge transfer; intraligand charge transfer; ligand centered charge transfer; HATN; oxadiazole; triarylamine; triphenylamine; multimetallic assembly

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Horvath, R. (2012). A Photophysical Investigation of d6 Metal Polypyridyl Complexes . (Doctoral Dissertation). University of Otago. Retrieved from http://hdl.handle.net/10523/2599

Chicago Manual of Style (16^th Edition):

Horvath, Raphael. “A Photophysical Investigation of d6 Metal Polypyridyl Complexes .” 2012. Doctoral Dissertation, University of Otago. Accessed March 07, 2021. http://hdl.handle.net/10523/2599.

MLA Handbook (7^th Edition):

Horvath, Raphael. “A Photophysical Investigation of d6 Metal Polypyridyl Complexes .” 2012. Web. 07 Mar 2021.

Vancouver:

Horvath R. A Photophysical Investigation of d6 Metal Polypyridyl Complexes . [Internet] [Doctoral dissertation]. University of Otago; 2012. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10523/2599.

Council of Science Editors:

Horvath R. A Photophysical Investigation of d6 Metal Polypyridyl Complexes . [Doctoral Dissertation]. University of Otago; 2012. Available from: http://hdl.handle.net/10523/2599

Queensland University of Technology

27. Wilson, Gregory J. Photocatalysis with a heterosupramolecular assembly.

Degree: 2006, Queensland University of Technology

URL: https://eprints.qut.edu.au/16290/

► Supramolecular chemistry has asserted itself as a significant multidisciplinary field concerned with molecular effects afforded through non-covalent molecular interactions. The increased interest in the literature… (more)

▼ Supramolecular chemistry has asserted itself as a significant multidisciplinary field concerned with molecular effects afforded through non-covalent molecular interactions. The increased interest in the literature towards nanoscale devices, through modulation of molecular function, has seen the renaissance of supramolecular chemistry as function progresses from solution to surface. Heterosupramolecular chemistry follows the architectural principles of supramolecular chemistry and embraces both covalent and non-covalent interactions of condensed phase surfaces and molecular components. A modular approach to device architecture was applied as a novel method of performing photocatalysis under visible light illumination. The application of heterosupramolecular assembly to the design of photoelectrochemical cells capable of visible light induced charge separation allowed the study of interfacial processes by means of electrochemical observations. Preparation of a series of supramolecular components was undertaken as specific molecular species within a photochemical system. Starting from a synthesised bidentate ligand that incorporated an acidic functional group, 4,4'-bis(methyl)phosphonate-2,2'-bipyridine (dmpbpy) as its ethyl ester, was chelated to give the surface sensitisers, bis-(2,2'-bipyridine)-(4,4'-bis(methyl)phosphonato-2,2'-bipyridine)ruthenium(II) dichloride ([Ru(bpy)2(dmpbpy)]Cl2) and cis-bis-(4,4'-bis-(methyl)phosphonato-2,2'-bipyridine)(2,2'-bipyridine)ruthenium(II) dichloride ([Ru(dmpbpy)2(bpy)]Cl2). An electron relay moiety with an acidic functional group, 1-ethyl-1'-(2-phosphonoethyl)-4,4'-bipyridinium dichloride (EVP), was also prepared using a procedure developed by the candidate. The electronic properties of the prepared photosensitisers were examined by theoretical quantum chemical TD-DFT calculations on the molecular structures and singlet excitations were discussed in relation to experimental data. This identified that the lowest lying LUMO states were consistently occupied by 2,2'-bipyridine (bpy) and this was speculated to be a factor affecting quantum injection yields. The effect of microwave modification of colloidal TiO2 suspensions under extended periods of treatment was investigated. Nanoparticles of TiO2 were compared and contrast to similar convection hydrothermally treated TiO2 and a commercial titania product, namely Degussa P25, both of which are utilised in device fabrication. The investigation identified that extended periods of microwave hydrothermal treatment do not greatly enhance the crystallinity and primary grain size of TiO2. The heterosupramolecular assembly of a multi-component photochemical system was constructed from prepared molecular and condensed phase components. It was demonstrated that this device was capable of inducing a photochemical reaction in H2O under irradiation with  > 420 nm in the absence of an organic electron donor. Interpretation of the photocurrents obtained from this assembly provided understanding of photochemical reactions under low…

Subjects/Keywords: Alternative energy storage; coordination complex; dye-sensitised; grey-water; heterosupramolecular; hydrogen gas; kinetic model; organic pollutants; photocatalysis; photo-degradation; photooxidation; titania; titanium dioxide; TiO2; ruthenium; visible-light

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wilson, G. J. (2006). Photocatalysis with a heterosupramolecular assembly. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/16290/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wilson, Gregory J. “Photocatalysis with a heterosupramolecular assembly.” 2006. Thesis, Queensland University of Technology. Accessed March 07, 2021. https://eprints.qut.edu.au/16290/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wilson, Gregory J. “Photocatalysis with a heterosupramolecular assembly.” 2006. Web. 07 Mar 2021.

Vancouver:

Wilson GJ. Photocatalysis with a heterosupramolecular assembly. [Internet] [Thesis]. Queensland University of Technology; 2006. [cited 2021 Mar 07]. Available from: https://eprints.qut.edu.au/16290/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wilson GJ. Photocatalysis with a heterosupramolecular assembly. [Thesis]. Queensland University of Technology; 2006. Available from: https://eprints.qut.edu.au/16290/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queensland University of Technology

28. Penny, Melissa. Mathematical modelling of dye-sensitised solar cells.

Degree: 2006, Queensland University of Technology

URL: https://eprints.qut.edu.au/16270/

► This thesis presents a mathematical model of the nanoporous anode within a dyesensitised solar cell (DSC). The main purpose of this work is to investigate… (more)

▼ This thesis presents a mathematical model of the nanoporous anode within a dyesensitised solar cell (DSC). The main purpose of this work is to investigate interfacial charge transfer and charge transport within the porous anode of the DSC under both illuminated and non-illuminated conditions. Within the porous anode we consider many of the charge transfer reactions associated with the electrolyte species, adsorbed dye molecules and semiconductor electrons at the semiconductor-dye- electrolyte interface. Each reaction at this interface is modelled explicitly via an electrochemical equation, resulting in an interfacial model that consists of a coupled system of non-linear algebraic equations. We develop a general model framework for charge transfer at the semiconductor-dye-electrolyte interface and simplify this framework to produce a model based on the available interfacial kinetic data. We account for the charge transport mechanisms within the porous semiconductor and the electrolyte filled pores that constitute the anode of the DSC, through a one- dimensional model developed under steady-state conditions. The governing transport equations account for the diffusion and migration of charge species within the porous anode. The transport model consists of a coupled system of non-linear differential equations, and is coupled to the interfacial model via reaction terms within the mass-flux balance equations. An equivalent circuit model is developed to account for those components of the DSC not explicitly included in the mathematical model of the anode. To obtain solutions for our DSC mathematical model we develop code in FORTRAN for the numerical simulation of the governing equations. We additionally employ regular perturbation analysis to obtain analytic approximations to the solutions of the interfacial charge transfer model. These approximations facilitate a reduction in computation time for the coupled mathematical model with no significant loss of accuracy. To obtain predictions of the current generated by the cell we source kinetic and transport parameter values from the literature and from experimental measurements associated with the DSC commissioned for this study. The model solutions we obtain with these values correspond very favourably with experimental data measured from standard DSC configurations consisting of titanium dioxide porous films with iodide/triiodide redox couples within the electrolyte. The mathematical model within this thesis enables thorough investigation of the interfacial reactions and charge transport within the DSC.We investigate the effects of modified cell configurations on the efficiency of the cell by varying associated parameter values in our model. We find, given our model and the DSC configuration investigated, that the efficiency of the DSC is improved with increasing electron diffusion, decreasing internal resistances and with decreasing dark current. We conclude that transport within the electrolyte, as described by the model, appears to have no limiting effect on the current…

Subjects/Keywords: anode; asymptotic analysis; charge injection; charge transfer; charge transport; differential equations; diffusion; dyesensitised solar cell; electrochemistry; electrolyte; electron injection; equivalent circuit; interfacial charge transfer; interfacial kinetics; iodide; lithium; mathematical modelling; migration; model; nanoporous; nonlinear equations; perturbation analysis; porous; porous film; reaction; recombination; semiconductor; semiconductordyeelectrolyte interface; semiconductorelectrolyte interface; sensitised; titanium dioxide; triiodide

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Penny, M. (2006). Mathematical modelling of dye-sensitised solar cells. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/16270/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Penny, Melissa. “Mathematical modelling of dye-sensitised solar cells.” 2006. Thesis, Queensland University of Technology. Accessed March 07, 2021. https://eprints.qut.edu.au/16270/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Penny, Melissa. “Mathematical modelling of dye-sensitised solar cells.” 2006. Web. 07 Mar 2021.

Vancouver:

Penny M. Mathematical modelling of dye-sensitised solar cells. [Internet] [Thesis]. Queensland University of Technology; 2006. [cited 2021 Mar 07]. Available from: https://eprints.qut.edu.au/16270/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Penny M. Mathematical modelling of dye-sensitised solar cells. [Thesis]. Queensland University of Technology; 2006. Available from: https://eprints.qut.edu.au/16270/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations