subject:(Light trapping)

University of New South Wales

1. Wang, Qian. Light trapping for electron-beam evaporated polycrystalline silicon solar cells.

Degree: Photovoltaics & Renewable Energy Engineering, 2013, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/53288 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11983/SOURCE02?view=true

► Effective light trapping is critical for polycrystalline silicon (poly-Si) thin-film solar cells to generate sufficiently high photocurrent. Glass substrate texturing is a standard and very… (more)

▼ Effective light trapping is critical for polycrystalline silicon (poly-Si) thin-film solar cells to generate sufficiently high photocurrent. Glass substrate texturing is a standard and very effective light-trapping approach for poly-Si solar cells fabricated by plasma enhanced chemical vapour deposition but it cannot be applied to poly-Si cells deposited by electron beam (e-beam) evaporation, which is a preferred deposition process. Attempts to develop effective light trapping for e-beam poly-Si cells, by texturing of either glass substrate or poly-Si film itself has been studied in this thesis. A spray etching method is designed for glass texturing, but it is proved not to be suitable for producing light trapping textures. Light trapping is then implemented by texturing of the rear surface of e-beam poly-Si films deposited on planar glass. Water-based solutions of KOH, NH4F and NH4F/H2O2 are found to be able to texture poly-Si films and, thus, to significantly improve light-trapping. The related texturing processes and resulting textures are characterised by Si etching rates, the surface roughness versus removed Si thickness, texture angle distributions, optical absorption and spectral response enhancement. Both 2.5% KOH and NH4F-only texturing are found to provide roughness over 200 nm RMS, steep peak feature angles up to 20˚ and higher absorption enhancement of 30~40% compared to planar films. With a removed Si thickness of less than 2 µm, NH4F-only texturing provides more advantages than 2.5% KOH etching. In order to apply this etch-back texturing to functional e-beam cells, a new spin-on diffused back-surface-field (BSF) subsequent to the texturing process has been successfully developed and therefore the short-circuit current (Jsc) enhancement with various etch-back texturing can be compared. A 3.6 µm thick e-beam cell with KOH etch-back texturing was demonstrated ~21% Jsc enhancement compared to a reference planar cell with a rear reflector and a 3 µm thick e-beam cell with NH4F-based texturing is achieved even higher Jsc enhancement of 28%. Thus, it is demonstrated that a wet-chemical etch-back texturing is a very promising approach to light-trapping in e-beam cells on planar substrates.

Subjects/Keywords: Jsc enhancement; Light-trapping; Texturing

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Wang, Q. (2013). Light trapping for electron-beam evaporated polycrystalline silicon solar cells. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/53288 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11983/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Wang, Qian. “Light trapping for electron-beam evaporated polycrystalline silicon solar cells.” 2013. Doctoral Dissertation, University of New South Wales. Accessed March 06, 2021. http://handle.unsw.edu.au/1959.4/53288 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11983/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Wang, Qian. “Light trapping for electron-beam evaporated polycrystalline silicon solar cells.” 2013. Web. 06 Mar 2021.

Vancouver:

Wang Q. Light trapping for electron-beam evaporated polycrystalline silicon solar cells. [Internet] [Doctoral dissertation]. University of New South Wales; 2013. [cited 2021 Mar 06]. Available from: http://handle.unsw.edu.au/1959.4/53288 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11983/SOURCE02?view=true.

Council of Science Editors:

Wang Q. Light trapping for electron-beam evaporated polycrystalline silicon solar cells. [Doctoral Dissertation]. University of New South Wales; 2013. Available from: http://handle.unsw.edu.au/1959.4/53288 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11983/SOURCE02?view=true

University of New South Wales

2. Chang, Yuan-Chih. Large Scale Light Trapping Nanostructures for Thin c-Si Solar Cells.

Degree: Photovoltaics & Renewable Energy Engineering, 2018, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/60419 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52153/SOURCE02?view=true

► The photovoltaic market has maintained rapid growth over the last two decades and is strongly dominated by Si with record cell efficiencies over 25% reported.… (more)

▼ The photovoltaic market has maintained rapid growth over the last two decades and is strongly dominated by Si with record cell efficiencies over 25% reported. These devices are approaching their theoretical efficiency limits and therefore the focus research on reducing the energy and material cost in fabrication becomes increasingly important. Cheaper solar cells could be achieved by reducing the absorber thickness as long as device efficiency is not negatively impacted, and this requires both good light-trapping (LT) and surface passivation. Conventional surface texturing can provide significant diffuse scattering for short wavelengths but the rough surface also potentially leads to increased surface recombination. This is also an issue for emerging tandem cell devices that would require a planar front for subsequent top cell depositions. Alternatively, plasmonic and diffraction gratings allow the wavelength of peak scattering to be tuned close to the bandgap without intrinsically affecting the surface passivation. In the last decade, numerous possible designs relying on plasmonics or/and diffraction gratings for enhancing light-trapping in thin solar cells have been reported. However, the conflict between efficiency gain, fabrication cost and controllability has prevented the commercial use. In this work, nanosphere lithography (NSL) has been investigated for large-area low-cost controllable fabrication of nanostructures suitable for incorporation in thin solar cells.A variety of periodic plasmonic nanostructures have been fabricated in order to demonstrate the wide usability of NSL fabrication techniques. These selected designs were first simulated using finite difference time domain methods to optimize the initial testbed fabrication efforts. Increased absorption has been observed from most testbed devices. Further investigation of the cost-effective incorporation of LT nanostructures into ultrathin c-Si solar cells was focused on the embedded nanosphere back-reflector structure. As part of this study, a novel Si wafer thinning technique was successfully developed to allow high quality and polished ultrathin c-Si wafers to be reliably produced in batches with an effective control of the resulting wafer thickness down to a few tens of micron. Comprehensive optical characterization was carried out on the final optical samples and the result show good agreement with the simulation indicating the fine controllability of the fabrication process. Furthermore, the test structures were found to yield an increased average absorption up to 11.1% (300-1200nm) which could potentially lead to a relative increase in photocurrent density of up to 4.33mA/cm2) in comparison to a planar 30?m-thick device. This work provides a promising approach to light-trapping in thin silicon solar cells but in order for this to be a competitive technology, more work is required to find a large-scale and cost-effective procedure for the production of thin wafers and solar cells, while further optimization of the light-trapping is still required… Advisors/Committee Members: Pilla, Supriya, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW, Bagnall, Darren, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW, Payne, David, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW, Pollard, Michael, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Ultrathin Solar Cells; Light Trapping; Plasmonics; Nanophotonics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Chang, Y. (2018). Large Scale Light Trapping Nanostructures for Thin c-Si Solar Cells. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60419 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52153/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Chang, Yuan-Chih. “Large Scale Light Trapping Nanostructures for Thin c-Si Solar Cells.” 2018. Doctoral Dissertation, University of New South Wales. Accessed March 06, 2021. http://handle.unsw.edu.au/1959.4/60419 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52153/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Chang, Yuan-Chih. “Large Scale Light Trapping Nanostructures for Thin c-Si Solar Cells.” 2018. Web. 06 Mar 2021.

Vancouver:

Chang Y. Large Scale Light Trapping Nanostructures for Thin c-Si Solar Cells. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Mar 06]. Available from: http://handle.unsw.edu.au/1959.4/60419 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52153/SOURCE02?view=true.

Council of Science Editors:

Chang Y. Large Scale Light Trapping Nanostructures for Thin c-Si Solar Cells. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60419 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52153/SOURCE02?view=true

University of New South Wales

3. Yang, Yang. Light management for high efficiency silicon solar cells.

Degree: Photovoltaics & Renewable Energy Engineering, 2012, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/52323 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10995/SOURCE01?view=true

► In this thesis, light trapping behaviour in silicon solar cells with textured front surfaces and rear reflectors has been characterized experimentally via two optical setups.… (more)

▼ In this thesis, light trapping behaviour in silicon solar cells with textured front surfaces and rear reflectors has been characterized experimentally via two optical setups. Various types of novel rear reflectors have been applied on the rear of front-planar PERT (Passivated Emitter and Rear Totally-Diffused) cells with their optical and electrical properties extensively investigated. Reflected light from textured front surfaces of a solar cell contains useful information about the surface geometry as well as the optical properties of the cell. The measured 2-D reflected light distributions from front surfaces of silicon cells textured in various ways are compared to those from conventional ray tracing models and are used to extract details of the surface morphologies. The rear surface reflection of a solar cell is angularly dependent if a textured front surface is applied. The use of hemispherical silicon as a test substrate has been successfully implemented enabling the analysis of the angular reflection properties of the back surface reflector over all incident angles without the restriction caused by refraction at the Si-air interface. Results show that a dielectrically displaced rear reflector scheme using 200 to 300 nm of SiO2 and an Ag mirror provides best angular reflection. The novel planar rear structures with dielectric stacks have been experimentally demonstrated to increase the reflected light intensity by 2.5% absolute at 1200 nm and the internal quantum efficiency (IQE) by 30% relatively at 1150 nm with similar surface passivation quality, compared to a conventional reflector. The best performing scattering reflector using Ag nanoparticles to create localised surface plasmons on the rear of the solar cell enhances the measured external quantum efficiency (EQE) by more than 4-fold at 1160 nm, corresponding to a 16% photocurrent increase (calculated from 900 nm to 1200 nm), compared to a cell with a conventional Al reflector. Thicknesses of the rear surface passivation SiO2 layer and the precursor evaporated Ag film are optimised to achieve maximum optical enhancement with minimum electrical losses. An optical enhancement of 6-fold is achieved at 1200 nm. Finally, an improved double-layer reflector is developed and optimised achieving a further current enhancement of 4.9 % compared to the single layer Ag nanoparticles scheme. Advisors/Committee Members: Green, Martin, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW, Ho-Baillie, Anita Wing Yi, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW, Kampwerth, Henner, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: rear reflectors; Angular light distribution; Light trapping; Rear reflectors

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Yang, Y. (2012). Light management for high efficiency silicon solar cells. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/52323 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10995/SOURCE01?view=true

Chicago Manual of Style (16^th Edition):

Yang, Yang. “Light management for high efficiency silicon solar cells.” 2012. Doctoral Dissertation, University of New South Wales. Accessed March 06, 2021. http://handle.unsw.edu.au/1959.4/52323 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10995/SOURCE01?view=true.

MLA Handbook (7^th Edition):

Yang, Yang. “Light management for high efficiency silicon solar cells.” 2012. Web. 06 Mar 2021.

Vancouver:

Yang Y. Light management for high efficiency silicon solar cells. [Internet] [Doctoral dissertation]. University of New South Wales; 2012. [cited 2021 Mar 06]. Available from: http://handle.unsw.edu.au/1959.4/52323 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10995/SOURCE01?view=true.

Council of Science Editors:

Yang Y. Light management for high efficiency silicon solar cells. [Doctoral Dissertation]. University of New South Wales; 2012. Available from: http://handle.unsw.edu.au/1959.4/52323 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10995/SOURCE01?view=true

Universiteit Utrecht

4. van Dijk, L. Internal and External Light Trapping for Solar Cells and Modules.

Degree: 2016, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/333997

► Renewable energy resources are essential to realize a sustainable society and a clean environment. In virtually all energy scenarios, solar power will supply a significant… (more)

Subjects/Keywords: External-Light-Trapping; Solar-Cells; Internal-Light-Trapping; Photovoltaics; 3D-Printing; Nano-imprinting; Thin-Films; Renewable-Energy; Solar-Energy; Silicon

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

van Dijk, L. (2016). Internal and External Light Trapping for Solar Cells and Modules. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/333997

Chicago Manual of Style (16^th Edition):

van Dijk, L. “Internal and External Light Trapping for Solar Cells and Modules.” 2016. Doctoral Dissertation, Universiteit Utrecht. Accessed March 06, 2021. http://dspace.library.uu.nl:8080/handle/1874/333997.

MLA Handbook (7^th Edition):

van Dijk, L. “Internal and External Light Trapping for Solar Cells and Modules.” 2016. Web. 06 Mar 2021.

Vancouver:

van Dijk L. Internal and External Light Trapping for Solar Cells and Modules. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2016. [cited 2021 Mar 06]. Available from: http://dspace.library.uu.nl:8080/handle/1874/333997.

Council of Science Editors:

van Dijk L. Internal and External Light Trapping for Solar Cells and Modules. [Doctoral Dissertation]. Universiteit Utrecht; 2016. Available from: http://dspace.library.uu.nl:8080/handle/1874/333997

University of Utah

5. Nagel, James Richard. Advanced methods for light trapping in optically thin silicon solar cells.

Degree: PhD, Electrical & Computer Engineering, 2011, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/43/rec/162

► The fi eld of light trapping is the study of how best to absorb light in a thin fi lm of material when most light… (more)

▼ The fi eld of light trapping is the study of how best to absorb light in a thin fi lm of material when most light either reflects away at the surface or transmits straight through to the other side. This has tremendous application to the fi eld of photovoltaics where thin silicon fi lms can be manufactured cheaply, but also fail to capture all of the available photons in the solar spectrum. Advancements in light trapping therefore bring us closer to the day when photovoltaic devices may reach grid parity with traditional fossil fuels on the electrical energy market. This dissertation advances our understanding of light trapping by fi rst modeling the eff ects of loss in planar dielectric waveguides. The mathematical framework developed here can be used to model any arbitrary three-layer structure with mixed gain or loss and then extract the total fi eld solution for the guided modes. It is found that lossy waveguides possess a greater number of eigenmodes than their lossless counterparts, and that these \loss guided” modes attenuate much more rapidly than conventional modes. Another contribution from this dissertation is the exploration of light trapping through the use of dielectric nanospheres embedded directly within the active layer of a thin silicon fi lm. The primary benefi t to this approach is that the device can utilize a surface nitride layer serving as an antireflective coating while still retaining the benefi ts of light trapping within the fi lm. The end result is that light trapping and light injection are eff ectively decoupled from each other and may be independently optimized within a single photovoltaic device. The fi nal contribution from this work is a direct numerical comparison between multiple light trapping schemes. This allows us to quantify the relative performances of various design techniques against one another and objectively determine which ideas tend to capture the most light. Using numerical simulation, this work directly compares the absorption gains due to embedded nanoparticles, surface text;ures, antireflective coatings, and plasmonic nanospheres. This work also introduces a new mathematical metric for dierentiating between index matching and angular scattering at a text;ured surface. Such information will prove useful in guiding future scientfi c eff orts in the fields of light trapping and light management in thin fi lm photovoltaics.

Subjects/Keywords: Photovoltaics; Thin films; Wave guidance; Light trapping; Light absorption; Silicon solar cells

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Nagel, J. R. (2011). Advanced methods for light trapping in optically thin silicon solar cells. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/43/rec/162

Chicago Manual of Style (16^th Edition):

Nagel, James Richard. “Advanced methods for light trapping in optically thin silicon solar cells.” 2011. Doctoral Dissertation, University of Utah. Accessed March 06, 2021. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/43/rec/162.

MLA Handbook (7^th Edition):

Nagel, James Richard. “Advanced methods for light trapping in optically thin silicon solar cells.” 2011. Web. 06 Mar 2021.

Vancouver:

Nagel JR. Advanced methods for light trapping in optically thin silicon solar cells. [Internet] [Doctoral dissertation]. University of Utah; 2011. [cited 2021 Mar 06]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/43/rec/162.

Council of Science Editors:

Nagel JR. Advanced methods for light trapping in optically thin silicon solar cells. [Doctoral Dissertation]. University of Utah; 2011. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/43/rec/162

Delft University of Technology

6. Vismara, R. (author). Optical characterization of photovoltaic materials and structures for thin-film solar cells based on advanced texturization.

Degree: 2014, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:0d969f35-fbe0-433d-905e-bd08768d1594

►

Advanced texturization is a promising approach to increase the performance of thin-film solar cells. Currently, light trapping schemes implemented in state-of-the-art devices utilize randomly textured… (more)

Subjects/Keywords: light management; light trapping; periodic gratings; asymmetric gratings; nanowires; optical characterization; optical simulations

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Vismara, R. (. (2014). Optical characterization of photovoltaic materials and structures for thin-film solar cells based on advanced texturization. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0d969f35-fbe0-433d-905e-bd08768d1594

Chicago Manual of Style (16^th Edition):

Vismara, R (author). “Optical characterization of photovoltaic materials and structures for thin-film solar cells based on advanced texturization.” 2014. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:0d969f35-fbe0-433d-905e-bd08768d1594.

MLA Handbook (7^th Edition):

Vismara, R (author). “Optical characterization of photovoltaic materials and structures for thin-film solar cells based on advanced texturization.” 2014. Web. 06 Mar 2021.

Vancouver:

Vismara R(. Optical characterization of photovoltaic materials and structures for thin-film solar cells based on advanced texturization. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:0d969f35-fbe0-433d-905e-bd08768d1594.

Council of Science Editors:

Vismara R(. Optical characterization of photovoltaic materials and structures for thin-film solar cells based on advanced texturization. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:0d969f35-fbe0-433d-905e-bd08768d1594

Delft University of Technology

7. Apte, A.A. (author). Textured back reflectors for thin-film silicon solar cells.

Degree: 2015, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:7d8c9a86-4638-46ab-b7c3-eeec4ec9ffe4

►

The low conversion efficiency of thin-film silicon solar cells currently prevents them from competing, commercially, with the dominant crystalline silicon technology. The small thickness of… (more)

Subjects/Keywords: back reflector; nanocrystalline silicon; thin-film; light trapping; light management; random textures

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Apte, A. A. (. (2015). Textured back reflectors for thin-film silicon solar cells. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:7d8c9a86-4638-46ab-b7c3-eeec4ec9ffe4

Chicago Manual of Style (16^th Edition):

Apte, A A (author). “Textured back reflectors for thin-film silicon solar cells.” 2015. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:7d8c9a86-4638-46ab-b7c3-eeec4ec9ffe4.

MLA Handbook (7^th Edition):

Apte, A A (author). “Textured back reflectors for thin-film silicon solar cells.” 2015. Web. 06 Mar 2021.

Vancouver:

Apte AA(. Textured back reflectors for thin-film silicon solar cells. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:7d8c9a86-4638-46ab-b7c3-eeec4ec9ffe4.

Council of Science Editors:

Apte AA(. Textured back reflectors for thin-film silicon solar cells. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:7d8c9a86-4638-46ab-b7c3-eeec4ec9ffe4

King Abdullah University of Science and Technology

8. Khan, Yasser. Light Management in Optoelectronic Devices with Disordered and Chaotic Structures.

Degree: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/235351

► With experimental realization, energy harvesting capabilities of chaotic microstructures were explored. Incident photons falling into chaotic trajectories resulted in energy buildup for certain frequencies. As… (more)

Subjects/Keywords: Light extraction; Light trapping; Quantifying disorder; Solid-state lighting; Energy harvesting; Microscopic Chaos

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Khan, Y. (2012). Light Management in Optoelectronic Devices with Disordered and Chaotic Structures. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/235351

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):

Khan, Yasser. “Light Management in Optoelectronic Devices with Disordered and Chaotic Structures.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed March 06, 2021. http://hdl.handle.net/10754/235351.

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

MLA Handbook (7^th Edition):

Khan, Yasser. “Light Management in Optoelectronic Devices with Disordered and Chaotic Structures.” 2012. Web. 06 Mar 2021.

Vancouver:

Khan Y. Light Management in Optoelectronic Devices with Disordered and Chaotic Structures. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10754/235351.

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

Council of Science Editors:

Khan Y. Light Management in Optoelectronic Devices with Disordered and Chaotic Structures. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/235351

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

University of California – Berkeley

9. Ganapati, Vidya. Optical Design Considerations for High Conversion Efficiency in Photovoltaics.

Degree: Electrical Engineering & Computer Sciences, 2015, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/63z91382

► This thesis explores ways to create highly efficient, thin-film solar cells. Both high short circuit current density and high open circuit voltage are required for… (more)

▼ This thesis explores ways to create highly efficient, thin-film solar cells. Both high short circuit current density and high open circuit voltage are required for high efficiency in photovoltaics. High current is achieved by absorbing most of the above bandgap photons, and then extracting the resulting electrons and holes. To achieve high absorption in thin films, surface texturing is necessary. Surface texturing allows for absorption enhancement due to total internal reflection, known as light trapping. However, in subwavelength-thick solar cells (~100 nm thick), the theory of light trapping is not understood, and both the maximum achievable absorption and the optimal surface texture are open questions. Computational electromagnetic optimization is used to find surface textures yielding an absorption enhancement of 40 times the absorption in a flat solar cell, the highest enhancement achieved in a subwavelength-thick solar cell with a realistic index of refraction. The optimization makes use of adjoint gradient methods, which allow the problem of designing a 3D surface to be computationally tractable.However, while high current requires high absorption, high voltage requires re-emission of the absorbed photons out of the front surface of the photovoltaic cell. This re-emission out the front of the solar cell is required by the detailed balance formulism outlined by Shockley and Quiesser in 1961. At the open circuit voltage condition, where no current is collected, ideally all absorbed photons are eventually re-emitted out the front surface of the solar cell. The small escape cone for a semiconductor/air interface, as described by Snell's law, makes it difficult for the photon to escape out of the front surface; it is much more likely for the luminescent photon to be lost to an absorbing back substrate. Thus, a back reflector on a solar cell is crucial to obtaining high voltage, as it helps the internally emitted photons in the cell escape out of the front surface. The open circuit voltage difference between a solar cell with a back mirror and a solar cell with an absorbing substrate is quantified, and it is found that the benefit of using a back mirror depends on the absorptivity of the solar cell material. The back mirror concept is extended to the sub-cells of a multijunction cell, and an air gap as an "intermediate" reflector is proposed and analyzed. In a dual junction solar cell, it is shown that proper mirror design with air gaps and antireflection coatings leads to an increase in open circuit voltage, resulting in a ~5% absolute efficiency increase in the solar cell. Finally, it is shown that these concepts in high efficiency solar cells can be extended to thermophotovoltaics. In solar photovoltaics, radiation from the sun is converted to electricity with photovoltaic cells. In thermophotovoltaics, radiation from a local heat source is converted to electricity with photovoltaic cells. This method of converting heat to electricity can be extremely efficient if sub-bandgap photons are reflected back and…

Subjects/Keywords: Electrical engineering; Adjoint Method; Light Trapping; Optimization; Photovoltaics; Solar Cells; Thermophotovoltaics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Ganapati, V. (2015). Optical Design Considerations for High Conversion Efficiency in Photovoltaics. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/63z91382

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):

Ganapati, Vidya. “Optical Design Considerations for High Conversion Efficiency in Photovoltaics.” 2015. Thesis, University of California – Berkeley. Accessed March 06, 2021. http://www.escholarship.org/uc/item/63z91382.

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

MLA Handbook (7^th Edition):

Ganapati, Vidya. “Optical Design Considerations for High Conversion Efficiency in Photovoltaics.” 2015. Web. 06 Mar 2021.

Vancouver:

Ganapati V. Optical Design Considerations for High Conversion Efficiency in Photovoltaics. [Internet] [Thesis]. University of California – Berkeley; 2015. [cited 2021 Mar 06]. Available from: http://www.escholarship.org/uc/item/63z91382.

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

Council of Science Editors:

Ganapati V. Optical Design Considerations for High Conversion Efficiency in Photovoltaics. [Thesis]. University of California – Berkeley; 2015. Available from: http://www.escholarship.org/uc/item/63z91382

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

University of Alberta

10. Xiong, Qiuyang. Nanostructure Engineering for Photovoltaics.

Degree: MS, Department of Electrical and Computer Engineering, 2016, University of Alberta

URL: https://era.library.ualberta.ca/files/c41687h69g

► The lead sulfide colloidal quantum dots (PbS CQD) solar cell has attracted wide attention in recent years for its facile fabrication process and low cost.… (more)

Subjects/Keywords: nanostructure; Colloidal quantum dot solar cell; light trapping

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Xiong, Q. (2016). Nanostructure Engineering for Photovoltaics. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/c41687h69g

Chicago Manual of Style (16^th Edition):

Xiong, Qiuyang. “Nanostructure Engineering for Photovoltaics.” 2016. Masters Thesis, University of Alberta. Accessed March 06, 2021. https://era.library.ualberta.ca/files/c41687h69g.

MLA Handbook (7^th Edition):

Xiong, Qiuyang. “Nanostructure Engineering for Photovoltaics.” 2016. Web. 06 Mar 2021.

Vancouver:

Xiong Q. Nanostructure Engineering for Photovoltaics. [Internet] [Masters thesis]. University of Alberta; 2016. [cited 2021 Mar 06]. Available from: https://era.library.ualberta.ca/files/c41687h69g.

Council of Science Editors:

Xiong Q. Nanostructure Engineering for Photovoltaics. [Masters Thesis]. University of Alberta; 2016. Available from: https://era.library.ualberta.ca/files/c41687h69g

Harvard University

11. Lin, Yu-Ting. Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications.

Degree: PhD, Engineering and Applied Sciences, 2014, Harvard University

URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274579

►

This dissertation explores strategies for improving photolvoltaic efficiency and reducing cost using femtosecond-laser processing methods including surface texturing and hyperdoping. Our investigations focus on two… (more)

Subjects/Keywords: Energy; Optics; Engineering; hyperdoping; laser; light trapping; mechanism; photovoltaics; texturing

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lin, Y. (2014). Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274579

Chicago Manual of Style (16^th Edition):

Lin, Yu-Ting. “Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications.” 2014. Doctoral Dissertation, Harvard University. Accessed March 06, 2021. http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274579.

MLA Handbook (7^th Edition):

Lin, Yu-Ting. “Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications.” 2014. Web. 06 Mar 2021.

Vancouver:

Lin Y. Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications. [Internet] [Doctoral dissertation]. Harvard University; 2014. [cited 2021 Mar 06]. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274579.

Council of Science Editors:

Lin Y. Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications. [Doctoral Dissertation]. Harvard University; 2014. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274579

Missouri University of Science and Technology

12. Margavio, Patrick Michael. Microlens array light trapping in CdTe/CdS solar cells.

Degree: M.S. in Mechanical Engineering, Mechanical Engineering, Missouri University of Science and Technology

URL: https://scholarsmine.mst.edu/masters_theses/4529

► "In light of the continued rise in fossil fuel costs, alternative energy sources, such as solar technology, are increasingly important. Concentrating photovoltaic systems are… (more)

Subjects/Keywords: Light trapping; Mechanical Engineering

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Margavio, P. M. (n.d.). Microlens array light trapping in CdTe/CdS solar cells. (Masters Thesis). Missouri University of Science and Technology. Retrieved from https://scholarsmine.mst.edu/masters_theses/4529

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16^th Edition):

Margavio, Patrick Michael. “Microlens array light trapping in CdTe/CdS solar cells.” Masters Thesis, Missouri University of Science and Technology. Accessed March 06, 2021. https://scholarsmine.mst.edu/masters_theses/4529.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7^th Edition):

Margavio, Patrick Michael. “Microlens array light trapping in CdTe/CdS solar cells.” Web. 06 Mar 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Margavio PM. Microlens array light trapping in CdTe/CdS solar cells. [Internet] [Masters thesis]. Missouri University of Science and Technology; [cited 2021 Mar 06]. Available from: https://scholarsmine.mst.edu/masters_theses/4529.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Margavio PM. Microlens array light trapping in CdTe/CdS solar cells. [Masters Thesis]. Missouri University of Science and Technology; Available from: https://scholarsmine.mst.edu/masters_theses/4529

Note: this citation may be lacking information needed for this citation format:
No year of publication.

University of Victoria

13. Brady, Brendan. Amorphous germanium optical cavity solar cells enhanced by plasmonic nanoparticles.

Degree: Department of Physics and Astronomy, 2017, University of Victoria

URL: https://dspace.library.uvic.ca//handle/1828/8915

► Thin-film photovoltaics are of great interest due to decreased manufacturing costs, improved environmental sustainability and the potential for flexible, semi-transparent, and light-weight modules. The scientific… (more)

Subjects/Keywords: Solar Cells; Plasmonics; Light-trapping; Thin-film; Photovoltaics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Brady, B. (2017). Amorphous germanium optical cavity solar cells enhanced by plasmonic nanoparticles. (Masters Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/8915

Chicago Manual of Style (16^th Edition):

Brady, Brendan. “Amorphous germanium optical cavity solar cells enhanced by plasmonic nanoparticles.” 2017. Masters Thesis, University of Victoria. Accessed March 06, 2021. https://dspace.library.uvic.ca//handle/1828/8915.

MLA Handbook (7^th Edition):

Brady, Brendan. “Amorphous germanium optical cavity solar cells enhanced by plasmonic nanoparticles.” 2017. Web. 06 Mar 2021.

Vancouver:

Brady B. Amorphous germanium optical cavity solar cells enhanced by plasmonic nanoparticles. [Internet] [Masters thesis]. University of Victoria; 2017. [cited 2021 Mar 06]. Available from: https://dspace.library.uvic.ca//handle/1828/8915.

Council of Science Editors:

Brady B. Amorphous germanium optical cavity solar cells enhanced by plasmonic nanoparticles. [Masters Thesis]. University of Victoria; 2017. Available from: https://dspace.library.uvic.ca//handle/1828/8915

Université Paris-Sud – Paris XI

14. Massiot, Inès. Design and fabrication of nanostructures for light-trapping in ultra-thin solar cells : Conception et réalisation de nanostructures pour le piégeage optique dans des cellules photovoltaïques ultra-minces.

Degree: Docteur es, Physique, 2013, Université Paris-Sud – Paris XI

URL: http://www.theses.fr/2013PA112245

►

Diminuer l'épaisseur de la couche d'absorbeur est une solution attractive pour produire des cellules photovoltaïques à coût réduit. Cela permet également de réduire la quantité… (more)

▼

Diminuer l'épaisseur de la couche d'absorbeur est une solution attractive pour produire des cellules photovoltaïques à coût réduit. Cela permet également de réduire la quantité de matériau actif utilisé ainsi que d'améliorer la collection du courant dans la cellule. Cette thèse s'est focalisée sur la conception de nanostructures pour exalter l'absorption de la lumière dans des couches de semiconducteur d'épaisseur réduite et ainsi proposer des cellules ultraminces efficaces.Dans un premier temps, nous avons proposé une approche originale pour piéger la lumière dans une cellule ultra-fine (≤ 100 nm) en silicium amorphe. Un réseau métallique est placé en face avant de la cellule déposée sur un miroir métallique afin d'obtenir une absorption multi-résonante large bande pour les deux polarisations de la lumière. Nous proposons aussi d'utiliser le réseau métallique comme une électrode transparente alternative afin de réduire les pertes optiques dans le contact avant de la cellule. Une analyse numérique approfondie des mécanismes résonants en jeu a été menée ainsi que la fabrication et la caractérisation optique de démonstrateurs.Dans un deuxième temps, nous avons appliqué ce concept de contact avant multi-résonant à des couches ultra-fines en arsenure de gallium (GaAs). Nous avons montré numériquement et expérimentalement le potentiel d'une nanogrille métallique bi-dimensionnelle pour le confinement efficace de la lumière dans 25 nm de GaAs.Enfin, nous avons étudié la possibilité de réduire l'épaisseur de cellules en silicium cristallin d'un facteur 10 à 100 par rapport à l'état de l'art. Nous avons développé un procédé pour transférer des couches de silicium cristallin de quelques microns d'épaisseur épitaxiées par PECVD sur un substrat hôte bas coût. Nous avons également travaillé à la structuration contrôlée de nanopyramides en vue d'un piégeage optique efficace dans ces couches minces.

Reducing the absorber thickness is an attractive solution to decrease the production cost of solar cells. Furthermore, it allows to reduce the amount of material needed and improve the current collection in the cell. This thesis has been focused on the design of nanostructures to enhance light absorption in very small semiconductor volumes in order to achieve efficient ultra-thin solar cells. First, we have proposed an original light-trapping concept for ultra-thin amorphous silicon (a-Si:H) solar cells. A one-dimensional metallic grating is patterned on the front surface of the cell deposited on a metallic mirror. Broadband multi-resonant absorption has been demonstrated for both light polarizations. The metallic grating is also used as an alternative transparent electrode in order to reduce optical losses in the front contact. A detailed analysis of the multi-resonant absorption mechanism has been carried out through numerical calculations. The fabrication and optical characterization of ultra-thin a-Si:H solar cells with metallic gratings have validated the multi-resonant approach.Second, we have proposed a design with a…

Advisors/Committee Members: Pelouard, Jean-Luc (thesis director).

Subjects/Keywords: Photovoltaïque; Piégeage optique; Photonique; Plasmonique; Photovoltaics; Light trapping; Photonics; Plasmonics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Massiot, I. (2013). Design and fabrication of nanostructures for light-trapping in ultra-thin solar cells : Conception et réalisation de nanostructures pour le piégeage optique dans des cellules photovoltaïques ultra-minces. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2013PA112245

Chicago Manual of Style (16^th Edition):

Massiot, Inès. “Design and fabrication of nanostructures for light-trapping in ultra-thin solar cells : Conception et réalisation de nanostructures pour le piégeage optique dans des cellules photovoltaïques ultra-minces.” 2013. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed March 06, 2021. http://www.theses.fr/2013PA112245.

MLA Handbook (7^th Edition):

Massiot, Inès. “Design and fabrication of nanostructures for light-trapping in ultra-thin solar cells : Conception et réalisation de nanostructures pour le piégeage optique dans des cellules photovoltaïques ultra-minces.” 2013. Web. 06 Mar 2021.

Vancouver:

Massiot I. Design and fabrication of nanostructures for light-trapping in ultra-thin solar cells : Conception et réalisation de nanostructures pour le piégeage optique dans des cellules photovoltaïques ultra-minces. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2013. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2013PA112245.

Council of Science Editors:

Massiot I. Design and fabrication of nanostructures for light-trapping in ultra-thin solar cells : Conception et réalisation de nanostructures pour le piégeage optique dans des cellules photovoltaïques ultra-minces. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2013. Available from: http://www.theses.fr/2013PA112245

University of Toronto

15. Foster, Stephen. Applications of Photonic Crystals to Photovoltaic Devices.

Degree: PhD, 2017, University of Toronto

URL: http://hdl.handle.net/1807/80848

► Photonic crystals are structures that exhibit wavelength-scale spatial periodicity in their dielectric function. They are best known for their ability to exhibit complete photonic band… (more)

▼ Photonic crystals are structures that exhibit wavelength-scale spatial periodicity in their dielectric function. They are best known for their ability to exhibit complete photonic band gaps (PBGs) - spectral regions over which no light can propagate within the crystal. PBGs are specific instances of a more general phenomenon, in which the local photonic density of states can be enhanced or suppressed over different frequency ranges by tuning the properties of the crystal. This can be used to redirect, concentrate, or even trap light incident on the crystal. In this thesis, we investigate how photonic crystals can be used to enhance the efficiency of photovoltaic devices by trapping light. Due to the many different types of photovoltaic devices in existence (varying widely in materials used, modes of operation, and internal structure), there is no single light trapping architecture that can be applied to all photovoltaics. In this work we study a number of different devices: dye-sensitized solar cells, polymer solar cells, silicon-perovskite tandem cells, and single-junction silicon cells. We propose novel photonic crystal-based light trapping designs for each type of device, and evaluate these designs numerically to demonstrate their effectiveness. Full-field optical simulations of the cell are performed for each design, using either finite element method (FEM) or finite-difference time-domain (FDTD) techniques. Where appropriate, electrical modelling of the cell is also performed, through either the use of a simple one-diode model, or by obtaining full solutions to the semiconductor drift-diffusion equations within the cell. In all cases we find that the photonic crystal-based designs significantly outperform their non-nanostructured counterparts. In the case of dye-sensitized and polymer cells, enhancements in light absorption of 33% and 40% (respectively) are seen, relative to reference cells with planar geometries. In the case of silicon-perovskite tandem cells and silicon cells, projected power conversion efficiencies of over 30% are obtained, well beyond the current world record for silicon-based cells. We conclude the thesis with a discussion on the overall prospects for photonic crystal-based solar cells, with a focus on the factors that make solar cell technologies amenable to light trapping. Advisors/Committee Members: John, Sajeev, Physics.

Subjects/Keywords: light trapping; optics; photonic crystals; photovoltaics; solar cells; solar energy; 0752

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Foster, S. (2017). Applications of Photonic Crystals to Photovoltaic Devices. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/80848

Chicago Manual of Style (16^th Edition):

Foster, Stephen. “Applications of Photonic Crystals to Photovoltaic Devices.” 2017. Doctoral Dissertation, University of Toronto. Accessed March 06, 2021. http://hdl.handle.net/1807/80848.

MLA Handbook (7^th Edition):

Foster, Stephen. “Applications of Photonic Crystals to Photovoltaic Devices.” 2017. Web. 06 Mar 2021.

Vancouver:

Foster S. Applications of Photonic Crystals to Photovoltaic Devices. [Internet] [Doctoral dissertation]. University of Toronto; 2017. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1807/80848.

Council of Science Editors:

Foster S. Applications of Photonic Crystals to Photovoltaic Devices. [Doctoral Dissertation]. University of Toronto; 2017. Available from: http://hdl.handle.net/1807/80848

University of Southern California

16. Lin, Chenxi. Nanophotonic light management in thin film silicon photovoltaics.

Degree: PhD, Electrical Engineering, 2013, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/352110/rec/4324

► This thesis is about light-trapping in thin film silicon photovoltaic devices. Light-trapping allows more light to be absorbed inside a smaller volume of photoactive materials,… (more)

▼ This thesis is about light-trapping in thin film silicon photovoltaic devices. Light-trapping allows more light to be absorbed inside a smaller volume of photoactive materials, therefore reducing the required active layer thickness for obtaining high optical absorption. The decrease in thickness can not only bring down the material cost of solar cells based on high-purity single-crystalline silicon, but also enable materials with poorer qualities, such as polycrystalline silicon to be used for photovoltaics, reducing both the material cost and processing cost. ❧ In this dissertation, we use three-dimensional full-vectorial electromagnetic simulation tools to explore various light-trapping schemes based on sub-wavelength nanostructures arranged in both periodic and partially-aperiodic fashion. In specific, periodic silicon nanowire and nanohole arrays were found to absorb more sunlight than an equally-thick silicon slab, if the geometry of the array is properly designed. The strong structural dependence of the optical absorption performance can be attributed to the optimal condition for exciting guided resonance modes within the nano-structured array. Furthermore, partially-aperiodic silicon nanowire/nanorod arrays show significant enhancement in light-trapping and anti-reflection performance, respectively, compared to their periodic counterparts in certain size regimes. Machine-based optimal design algorithm was utilized to maximize the optical performance enhancement. In order to verify the theoretically-predicted optical absorption enhancement effect, proof-of-concept experimental demonstration has been carried out for free-standing silicon nanomembranes patterned with both periodic and partially-aperiodic nanohole structures. Good agreement between theory and experiment was obtained, suggesting the wide applicability of electromagnetic simulations and optimal design techniques in the optical design of nano-structured thin film solar cells. Finally, the effect of plasmonic particles on the optical absorption in silicon nanowire arrays was numerically examined. It was found that due to the existence of diffractive coupling scheme afforded by the nanowire array itself, the plasmonic particles do not improve the optical absorption within the silicon nanowires. Advisors/Committee Members: Povinelli, Michelle L. (Committee Chair), Dapkus, Paul Daniel (Committee Member), Wu, Wei (Committee Member), Nakano, Aiichiro (Committee Member).

Subjects/Keywords: nanophotonics; nanowires; plasmonics; light-trapping; thin films; solar cells; optimal design

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lin, C. (2013). Nanophotonic light management in thin film silicon photovoltaics. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/352110/rec/4324

Chicago Manual of Style (16^th Edition):

Lin, Chenxi. “Nanophotonic light management in thin film silicon photovoltaics.” 2013. Doctoral Dissertation, University of Southern California. Accessed March 06, 2021. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/352110/rec/4324.

MLA Handbook (7^th Edition):

Lin, Chenxi. “Nanophotonic light management in thin film silicon photovoltaics.” 2013. Web. 06 Mar 2021.

Vancouver:

Lin C. Nanophotonic light management in thin film silicon photovoltaics. [Internet] [Doctoral dissertation]. University of Southern California; 2013. [cited 2021 Mar 06]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/352110/rec/4324.

Council of Science Editors:

Lin C. Nanophotonic light management in thin film silicon photovoltaics. [Doctoral Dissertation]. University of Southern California; 2013. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/352110/rec/4324

17. Sberna, Paolo Maria. Novel Approaches to Photoactive Nanostructured Materials for Efficient Solar Cells.

Degree: 2015, Università degli Studi di Catania

URL: http://hdl.handle.net/10761/4040

► Con l'attività di ricerca, riportata in questa tesi di Dottorato, ho fornito, alle questioni concernenti il fotovoltaico, i seguenti contributi: 1.Ricerca e sviluppo di un… (more)

Subjects/Keywords: Area 02 - Scienze fisiche; Solar Cell, Light Trapping, Cuprous Oxide

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Sberna, P. M. (2015). Novel Approaches to Photoactive Nanostructured Materials for Efficient Solar Cells. (Thesis). Università degli Studi di Catania. Retrieved from http://hdl.handle.net/10761/4040

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):

Sberna, Paolo Maria. “Novel Approaches to Photoactive Nanostructured Materials for Efficient Solar Cells.” 2015. Thesis, Università degli Studi di Catania. Accessed March 06, 2021. http://hdl.handle.net/10761/4040.

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

MLA Handbook (7^th Edition):

Sberna, Paolo Maria. “Novel Approaches to Photoactive Nanostructured Materials for Efficient Solar Cells.” 2015. Web. 06 Mar 2021.

Vancouver:

Sberna PM. Novel Approaches to Photoactive Nanostructured Materials for Efficient Solar Cells. [Internet] [Thesis]. Università degli Studi di Catania; 2015. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10761/4040.

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

Council of Science Editors:

Sberna PM. Novel Approaches to Photoactive Nanostructured Materials for Efficient Solar Cells. [Thesis]. Università degli Studi di Catania; 2015. Available from: http://hdl.handle.net/10761/4040

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

University of New South Wales

18. Pakhuruddin, Mohd. Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates.

Degree: Photovoltaics & Renewable Energy Engineering, 2016, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/56490 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true

► Incomplete light absorption makes effective light-trapping (LT) crucial for realising higher short-circuit current densities (Jsc) in liquid-phase crystallised silicon (LPC Si) thin-film solar cells on… (more)

▼ Incomplete light absorption makes effective light-trapping (LT) crucial for realising higher short-circuit current densities (Jsc) in liquid-phase crystallised silicon (LPC Si) thin-film solar cells on glass superstrate. Through a systematic investigation, this research aims to develop, optimise and incorporate different LT features (improving both light-coupling and light-trapping) into 10 um thin solar cells crystallised by a continuous wave diode laser on borosilicate glass. The features include anti-reflection (AR) layers, back surface reflectors (BSRs), Si texturing and glass texturing. Potential Jsc estimated from optical characterisation is used to optimise different LT features. The optimised features are then incorporated into active solar cells and the actual Jsc is derived from external quantum efficiency measurement.An AR foil is used on the front air-side of the glass to improve broadband light-coupling. With the foil, the Jsc is increased by 1.1 mA/cm2 (5.5% enhancement). BSRs are evaluated to enhance long wavelengths absorption. The optimum BSR is found by combining silver nanoparticles, white paint and the AR foil, with Jsc of 23.3 mA/cm2 (18.9% enhancement).Si texturing is done by wet chemical etching to increase long wavelengths absorption. Porous mask texturing, ammonium fluoride and potassium hydroxide-based solutions (KOH) are evaluated. KOH-based texturing is the best method, with Jsc up to 25.4 mA/cm2 (24.5% enhancement), when combined with white paint BSR and AR foil. Glass is mechanically abraded to enhance broadband absorption. Following abrasion, prolonged glass etching resulting in surface roughness below 600 nm is required to enable a successful crystallisation of the Si films on the textured glass. The films exhibit large grains of several hundred micrometers in width and up to centimeters in length, similar to the films crystallised on planar glass. A significant broadband absorption enhancement is achieved, but electrical degradation is observed in the solar cells, indicating incompatibility of the e-beam evaporated LPC Si solar cells with the textured superstrate.The most effective LT scheme for the LPC Si solar cells on glass superstrate is realised by the rear Si texturing (with KOH-based solution) combined with white paint BSR and front AR foil, with Jsc of 25.4 mA/cm2 (24.5% enhancement). Advisors/Committee Members: Varlamov, Sergey, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW, Huang, Jialiang, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Liquid-phase crystallisation; Absorption enhancement; Light trapping; Polycrystalline silicon

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Pakhuruddin, M. (2016). Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/56490 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Pakhuruddin, Mohd. “Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates.” 2016. Doctoral Dissertation, University of New South Wales. Accessed March 06, 2021. http://handle.unsw.edu.au/1959.4/56490 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Pakhuruddin, Mohd. “Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates.” 2016. Web. 06 Mar 2021.

Vancouver:

Pakhuruddin M. Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates. [Internet] [Doctoral dissertation]. University of New South Wales; 2016. [cited 2021 Mar 06]. Available from: http://handle.unsw.edu.au/1959.4/56490 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true.

Council of Science Editors:

Pakhuruddin M. Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates. [Doctoral Dissertation]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/56490 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true

University of California – Berkeley

19. Bronstein, Noah. Material and Optical Design Rules for High Performance Luminescent Solar Concentrators.

Degree: Chemistry, 2015, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/04p1p3zj

► This dissertation will highlight a path to achieve high photovoltaic conversion efficiency in luminescent solar concentrators, devices which absorb sunlight with a luminescent dye and… (more)

▼ This dissertation will highlight a path to achieve high photovoltaic conversion efficiency in luminescent solar concentrators, devices which absorb sunlight with a luminescent dye and then re-emit it into a waveguide where it is ultimately collected by a photovoltaic cell. Luminescent concentrators have been studied for more than three decades as potential low-cost but not high efficiency photovoltaics. Astute application of the blackbody radiation law indicates that photonic design is necessary to achieve high efficiency: a reflective filter must be used to trap luminescence at all angles while allowing higher energy photons to pass through. In addition, recent advances in the synthesis of colloidal nanomaterials have created the possibility for lumophores with broad absorption spectra, narrow-bandwidth emission, high luminescence quantum yield, tunable Stokes shifts and tunable Stokes ratios. Together, these factors allow luminescent solar concentrators to achieve the optical characteristics necessary for high efficiency.We have fabricated and tested the first generation of these devices. Our experiments demonstrate that the application of carefully matched photonic mirrors and luminescent quantum dots can allow luminescent concentration factors to reach record values while maintaining high photon collection efficiency. Finally, the photonic mirror dramatically mitigates the negative impact of scattering in the waveguide, allowing efficient photon collection over distances much longer than the scattering length of the waveguide.After demonstrating the possibility for high performance, we theoretically explore the efficacy of luminescent concentrators with dielectric reflectors as the high-bandgap top-junctions in two-junction devices. Simple thermodynamic calculations indicate that this approach can be nearly as good as a traditional vertically stacked tandem. The major barriers to such a device are the optical design of narrow-bandwidth, angle-insensitive reflectors with near-unity reflectivity in the reflection band and near unity transmissivity in the pass-band. Additionally, lumophores with narrow emission line widths and carefully controlled Stokes shifts are required. If new lumophores and optical designs can be created that meet the demanding needs of this application, high performance two-junction photovoltaics that collect both the direct and diffuse light could be achieved.

Subjects/Keywords: Nanotechnology; Materials Science; Optics; Light Trapping; Luminescent solar concentrator; Nanocrystal; Photovoltaic; Quantum dot

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Bronstein, N. (2015). Material and Optical Design Rules for High Performance Luminescent Solar Concentrators. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/04p1p3zj

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):

Bronstein, Noah. “Material and Optical Design Rules for High Performance Luminescent Solar Concentrators.” 2015. Thesis, University of California – Berkeley. Accessed March 06, 2021. http://www.escholarship.org/uc/item/04p1p3zj.

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

MLA Handbook (7^th Edition):

Bronstein, Noah. “Material and Optical Design Rules for High Performance Luminescent Solar Concentrators.” 2015. Web. 06 Mar 2021.

Vancouver:

Bronstein N. Material and Optical Design Rules for High Performance Luminescent Solar Concentrators. [Internet] [Thesis]. University of California – Berkeley; 2015. [cited 2021 Mar 06]. Available from: http://www.escholarship.org/uc/item/04p1p3zj.

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

Council of Science Editors:

Bronstein N. Material and Optical Design Rules for High Performance Luminescent Solar Concentrators. [Thesis]. University of California – Berkeley; 2015. Available from: http://www.escholarship.org/uc/item/04p1p3zj

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

NSYSU

20. Lu, Cheng-Han. Enabling techniques for enhanced light trapping in CMOS photovoltaic devices.

Degree: Master, Electro-Optical Engineering, 2017, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723117-153033

► In this dissertation, we utilize the standard bulk CMOS process to implement backside-illuminated photovoltaic devices (PVs) with backside grating reflectors realized by the polysilicon gate… (more)

Subjects/Keywords: Conversion Efficiency; surface antireflection; Light trapping; Polysilicon grating reflector; Backside illuminated CMOS photovoltaic devices

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lu, C. (2017). Enabling techniques for enhanced light trapping in CMOS photovoltaic devices. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723117-153033

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):

Lu, Cheng-Han. “Enabling techniques for enhanced light trapping in CMOS photovoltaic devices.” 2017. Thesis, NSYSU. Accessed March 06, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723117-153033.

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

MLA Handbook (7^th Edition):

Lu, Cheng-Han. “Enabling techniques for enhanced light trapping in CMOS photovoltaic devices.” 2017. Web. 06 Mar 2021.

Vancouver:

Lu C. Enabling techniques for enhanced light trapping in CMOS photovoltaic devices. [Internet] [Thesis]. NSYSU; 2017. [cited 2021 Mar 06]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723117-153033.

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

Council of Science Editors:

Lu C. Enabling techniques for enhanced light trapping in CMOS photovoltaic devices. [Thesis]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723117-153033

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

21. R. RENGAIYAN. A NOVEL STUDY ON LIGHT TRAPPING SCHEME FOR THIN SILICON SOLAR CELLS USING MICROLENSES;.

Degree: Physics, 2014, Periyar University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/20401

The sun the abundant eco friendly renewable energy source trapped newline

Advisors/Committee Members: Dr. P. M. Anbarasan.

Subjects/Keywords: LIGHT TRAPPING; THIN SILICON SOLAR CELLS

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

RENGAIYAN, R. (2014). A NOVEL STUDY ON LIGHT TRAPPING SCHEME FOR THIN SILICON SOLAR CELLS USING MICROLENSES;. (Thesis). Periyar University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/20401

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):

RENGAIYAN, R.. “A NOVEL STUDY ON LIGHT TRAPPING SCHEME FOR THIN SILICON SOLAR CELLS USING MICROLENSES;.” 2014. Thesis, Periyar University. Accessed March 06, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/20401.

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

MLA Handbook (7^th Edition):

RENGAIYAN, R.. “A NOVEL STUDY ON LIGHT TRAPPING SCHEME FOR THIN SILICON SOLAR CELLS USING MICROLENSES;.” 2014. Web. 06 Mar 2021.

Vancouver:

RENGAIYAN R. A NOVEL STUDY ON LIGHT TRAPPING SCHEME FOR THIN SILICON SOLAR CELLS USING MICROLENSES;. [Internet] [Thesis]. Periyar University; 2014. [cited 2021 Mar 06]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/20401.

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

Council of Science Editors:

RENGAIYAN R. A NOVEL STUDY ON LIGHT TRAPPING SCHEME FOR THIN SILICON SOLAR CELLS USING MICROLENSES;. [Thesis]. Periyar University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/20401

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

Penn State University

22. Hall, Anthony Shoji. Template Replication of Nanomaterials.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/21942

► This thesis focuses on one central theme, the template replication of nanomaterials. The first half of this thesis focuses on studying new properties that emerge… (more)

▼ This thesis focuses on one central theme, the template replication of nanomaterials. The first half of this thesis focuses on studying new properties that emerge in nanostructured materials prepared by existing template replication strategies. The second half of this thesis focuses on the development of novel strategies to synthesize nanomaterials by replication of nanoscale templates. Chapter 1 of this thesis presents an introduction to the synthesis of nanomaterials by template replication. Top down and bottom up approaches are covered in this chapter. Chapter 2 of this thesis presents the different techniques used to characterize the materials studied in this thesis. Chapter 3 presents the optical properties of one-dimensional metallic gratings coupled to a one-dimensional photonic crystal. Light incident upon a periodically corrugated metal/dielectric interface can generate surface plasmon-polariton (SPP) waves. This effect is used in many sensing applications. Similar metallodielectric nanostructures are used for light trapping in solar cells, but the gains are modest because SPP waves can be excited only at specific angles and with one linear polarization state of incident light. Here we report the optical absorptance of a metallic grating coupled to silicon oxide/oxynitride layers with a periodically varying refractive index, i.e., a 1D photonic crystal. These structures show a dramatic enhancement relative to those employing a homogeneous dielectric material. Multiple SPP waves can be activated, and both s- and p-polarized incident light can be efficiently trapped. Many SPP modes are weakly bound and display field enhancements that extend throughout the dielectric layers. These modes have significantly longer propagation lengths than the single SPP modes excited at the interface of a metallic grating and a uniform dielectric. These results suggest that metallic gratings coupled to photonic crystals could have utility for light trapping in photovoltaics, sensing, and other applications. The metallic gratings used in this study were prepared by template replication process. Chapter 4 in this dissertation presents data which demonstrates that the resonance frequency of multiple SPP waves can be tuned by varying the periodicity of the metallic grating. In this study only p-polarized incident light was considered in the visible and near-infrared regimes. When the absorptance was plotted against the angle of incidence, the excitation of an SPP wave was indicated by an absorptance peak whose angular location did not change with the number of periods (beyond a threshold) of the photonic crystal. A decrease in the period of the metal grating resulted in shifting the excitation of the SPP waves to smaller wavelengths. The metallic gratings used in this study were prepared by template replication process. Chapter 5 in this dissertation presents a new method of fabricating wafer scale metallic gratings. By combining nanosphere lithography with template stripping, silicon wafers were patterned with hexagonal… Advisors/Committee Members: Tom Mallouk, Dissertation Advisor/Co-Advisor, Raymond Edward Schaak, Committee Member, John V Badding, Committee Member, Douglas Henry Werner, Special Member.

Subjects/Keywords: Plasmonics; Porous Materials; Replication; Metal Organic Frameworks; Light Trapping; Nanocasting; Photonic Crystals

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Hall, A. S. (2014). Template Replication of Nanomaterials. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/21942

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):

Hall, Anthony Shoji. “Template Replication of Nanomaterials.” 2014. Thesis, Penn State University. Accessed March 06, 2021. https://submit-etda.libraries.psu.edu/catalog/21942.

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

MLA Handbook (7^th Edition):

Hall, Anthony Shoji. “Template Replication of Nanomaterials.” 2014. Web. 06 Mar 2021.

Vancouver:

Hall AS. Template Replication of Nanomaterials. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Mar 06]. Available from: https://submit-etda.libraries.psu.edu/catalog/21942.

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

Council of Science Editors:

Hall AS. Template Replication of Nanomaterials. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/21942

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

University of Washington

23. Steward, Malia Koleti. Development of Wrinkled Surface for Enhanced Light Trapping in Organic Solar Cells.

Degree: 2018, University of Washington

URL: http://hdl.handle.net/1773/42907

► There have been great interest in organic photovoltaics (OPVs) due to their potential for the development of low-cost, high throughput, and large-area solar cells with… (more)

Subjects/Keywords: Electroplating; Light trapping; Organic solar cells; Ray optics; Electrical engineering; Electrical engineering

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Steward, M. K. (2018). Development of Wrinkled Surface for Enhanced Light Trapping in Organic Solar Cells. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/42907

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):

Steward, Malia Koleti. “Development of Wrinkled Surface for Enhanced Light Trapping in Organic Solar Cells.” 2018. Thesis, University of Washington. Accessed March 06, 2021. http://hdl.handle.net/1773/42907.

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

MLA Handbook (7^th Edition):

Steward, Malia Koleti. “Development of Wrinkled Surface for Enhanced Light Trapping in Organic Solar Cells.” 2018. Web. 06 Mar 2021.

Vancouver:

Steward MK. Development of Wrinkled Surface for Enhanced Light Trapping in Organic Solar Cells. [Internet] [Thesis]. University of Washington; 2018. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1773/42907.

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

Council of Science Editors:

Steward MK. Development of Wrinkled Surface for Enhanced Light Trapping in Organic Solar Cells. [Thesis]. University of Washington; 2018. Available from: http://hdl.handle.net/1773/42907

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

University of Victoria

24. Ehtaiba, Jamal Mehemed. An integrated nanoaperture optical-fiber tweezer for developing single-photon sources.

Degree: Department of Electrical and Computer Engineering, 2020, University of Victoria

URL: http://hdl.handle.net/1828/11718

► In this thesis, an approach for developing single-photon sources at the 1550nm wavelength will be demonstrated, based on optical trapping of luminescent upconverting nanoparticles. A… (more)

▼ In this thesis, an approach for developing single-photon sources at the 1550nm wavelength will be demonstrated, based on optical trapping of luminescent upconverting nanoparticles. A single-photon source is a source that emits a single photon at a time, and hence it is a source of quantum bits that constitutes the basic building units in quantum computers and quantum communications. The approach exploits the plasmonic properties of gold films and the waveguiding characteristics of single mode optical fibers (SMFs). We start by planar nanofabrication of subwavelength nanoapertures in a thin gold film based on finite difference time domain simulations for a peak transmission at the wavelength in question. Subsequently, using ultraviolet curable epoxy adhesion material, a nanoaperture patterned on a gold film can be transferred to an SMF tip forming a nanoantenna enhanced optical fiber tweezer (NAFT). As a final step in building the optical tweezer, a test of the capability of the integrated optical fiber tweezer to trap 20 nm, and 30nm polystyrene nanospheres, as well as luminescent upconverting nanoparticles (UCNPs), has been experimentally realized with encouraging results. In addition to the optical trapping of the luminescent nanoparticles, the nano aperture antenna can improve light coupling into the low loss optical fiber guiding channel. Also, it could have a positive influence on enhancing the photon emission rate through the Purcell effect. Furthermore, we have combined NAFT with a low insertion loss wave splitter, a wavelength-division multiplexer (WDM), to allow measuring the 1550nm photon-emission statistics on a cooled superconducting nanowire single-photon detector (SNSPD) at ~ 2.4o K. Eventually, nanoantenna enhanced optical fiber tweezers can play an essential role in optical trapping towards developing single-photon sources and the emerging technology of quantum information processing, computation, and cryptography. Advisors/Committee Members: Gordon, Reuven (supervisor).

Subjects/Keywords: UCNPs; Optical Trapping; Optical Tweezer; Optical Fiber; Single Photon; Second Coherence; Antibuched Light; Nanoantenna; WDM

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Ehtaiba, J. M. (2020). An integrated nanoaperture optical-fiber tweezer for developing single-photon sources. (Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/11718

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):

Ehtaiba, Jamal Mehemed. “An integrated nanoaperture optical-fiber tweezer for developing single-photon sources.” 2020. Thesis, University of Victoria. Accessed March 06, 2021. http://hdl.handle.net/1828/11718.

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

MLA Handbook (7^th Edition):

Ehtaiba, Jamal Mehemed. “An integrated nanoaperture optical-fiber tweezer for developing single-photon sources.” 2020. Web. 06 Mar 2021.

Vancouver:

Ehtaiba JM. An integrated nanoaperture optical-fiber tweezer for developing single-photon sources. [Internet] [Thesis]. University of Victoria; 2020. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1828/11718.

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

Council of Science Editors:

Ehtaiba JM. An integrated nanoaperture optical-fiber tweezer for developing single-photon sources. [Thesis]. University of Victoria; 2020. Available from: http://hdl.handle.net/1828/11718

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

25. Chen, Hung-Ling. Ultrathin and nanowire-based GaAs solar cells : Cellules solaires en GaAs ultra-minces et à base de nanofils.

Degree: Docteur es, Electronique et Optoélectronique, Nano- et Microtechnologies, 2018, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2018SACLS355

►

Confiner la lumière dans un volume réduit d'absorbeur photovoltaïque offre de nouvelles voies pour les cellules solaires à haute rendement. Ceci peut être réalisé en… (more)

▼

Confiner la lumière dans un volume réduit d'absorbeur photovoltaïque offre de nouvelles voies pour les cellules solaires à haute rendement. Ceci peut être réalisé en utilisant des nanostructures pour le piégeage optique ou des nanofils de semi-conducteurs. Dans une première partie, nous présentons la conception et la fabrication de cellules solaires ultra-minces (205 nm) en GaAs. Nous obtenons des résonances multiples grâce à un miroir arrière nanostructuré en TiO2/Ag fabriqué par nanoimpression, résultant en un courant de court-circuit élevé de 24,6 mA/cm². Nous obtenons le record d’efficacité de 19,9%. Nous analysons les mécanismes des pertes et nous proposons une voie réaliste vers un rendement de 25% en utilisant un absorbeur de GaAs de 200 nm d'épaisseur seulement. Dans une deuxième partie, nous étudions les propriétés de nanofils en GaAs crûs sur substrats Si et nous explorons leur potentiel comme absorbeur photovoltaïque. Un dopage élevé est souhaité dans les cellules solaires à nanofils en jonction coeur-coquille, mais la caractérisation à l'échelle d'un nanofil unique reste difficile. Nous montrons que la cathodoluminescence (CL) peut être utilisée pour déterminer les niveaux de dopage de GaAs de type n et p avec une résolution nanométrique. Les semi-conducteurs III-V de type n présentent une émission décalée vers le bleu, à cause du remplissage de la bande de conduction, tandis que les semi-conducteurs de type p présentent une émission décalée vers le rouge due à la réduction du gap. La loi de Planck généralisée est utilisée pour fitter tout le spectre et ainsi évaluer quantitativement le niveau de dopage. Nous utilisons également la polarimétrie de CL pour déterminer sélectivement les propriétés de phases wurtzite/zinc-blende d'un nanofil unique. Nous montrons enfin des cellules solaires fonctionnelles à nanofils de GaAs. Ces travaux ouvrent des perspectives vers une nouvelle génération de cellules photovoltaïques.

Confining sunlight in a reduced volume of photovoltaic absorber offers new directions for high-efficiency solar cells. This can be achieved using nanophotonic structures for light trapping, or semiconductor nanowires. First, we have designed and fabricated ultrathin (205 nm) GaAs solar cells. Multi-resonant light trapping is achieved with a nanostructured TiO2/Ag back mirror fabricated using nanoimprint lithography, resulting in a high short-circuit current of 24.6 mA/cm². We obtain the record 1 sun efficiency of 19.9%. A detailed loss analysis is carried out and we provide a realistic pathway toward 25% efficiency using only 200 nm-thick GaAs absorber. Second, we investigate the properties of GaAs nanowires grown on Si substrates and we explore their potential as active absorber. High doping is desired in core-shell nanowire solar cells, but the characterization of single nanowires remains challenging. We show that cathodoluminescence (CL) mapping can be used to determine both n-type and p-type doping levels of GaAs with nanometer scale resolution. n-type III-V semiconductor shows…

Advisors/Committee Members: Collin, Stéphane (thesis director).

Subjects/Keywords: Cathodoluminescence; GaAs; Dopage; Piégeage optique; Nanofils; Cathodoluminescence; Doping; Light trapping; GaAs; Nanowires

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Chen, H. (2018). Ultrathin and nanowire-based GaAs solar cells : Cellules solaires en GaAs ultra-minces et à base de nanofils. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2018SACLS355

Chicago Manual of Style (16^th Edition):

Chen, Hung-Ling. “Ultrathin and nanowire-based GaAs solar cells : Cellules solaires en GaAs ultra-minces et à base de nanofils.” 2018. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed March 06, 2021. http://www.theses.fr/2018SACLS355.

MLA Handbook (7^th Edition):

Chen, Hung-Ling. “Ultrathin and nanowire-based GaAs solar cells : Cellules solaires en GaAs ultra-minces et à base de nanofils.” 2018. Web. 06 Mar 2021.

Vancouver:

Chen H. Ultrathin and nanowire-based GaAs solar cells : Cellules solaires en GaAs ultra-minces et à base de nanofils. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2018. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2018SACLS355.

Council of Science Editors:

Chen H. Ultrathin and nanowire-based GaAs solar cells : Cellules solaires en GaAs ultra-minces et à base de nanofils. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2018. Available from: http://www.theses.fr/2018SACLS355

Université Paris-Sud – Paris XI

26. Colin, Clément. Metallic nano-structures for light-trapping in ultra-thin GaAs and CIGS solar cells : Nano-structures métalliques pour du piégeage optique dans des cellules solaires ultra-fines à base de GaAs et de CIGS.

Degree: Docteur es, Physique, 2013, Université Paris-Sud – Paris XI

URL: http://www.theses.fr/2013PA112305

►

L’une des tendances naturelle des technologies photovoltaïque est la réduction systématique de l’épaisseur des cellules solaires, que cela soit pour des raisons de coûts, d’économie… (more)

▼

L’une des tendances naturelle des technologies photovoltaïque est la réduction systématique de l’épaisseur des cellules solaires, que cela soit pour des raisons de coûts, d’économie d’éléments rares ou toxiques ou encore pour limiter les recombinaisons. Jusqu’à présent, les technologies couche minces cristallines (GaAs) et poly-crystallines (CIGS) trouvent des optimum d’efficacité de conversion pour des épaisseurs aux alentours de 1 ou 2 microns. Typiquement, cette gamme d’épaisseur ne nécessite pas de nouvelles solutions de piégeages optiques comme cela est le cas pour la filière silicium amorphe. Cependant, si l’on veut réduire ces épaisseurs d’un facteur 10 voire même 100 afin de s’orienter vers les nouveaux concepts de collections et conversions (GaAs ou GaSb) ou encore de réduire l’utilisation d’indium (CIGS), de nouveaux besoin en matière d’absorption efficace de la lumière sont nécessaires pour ces technologies. Ce manuscrit de thèse se concentre sur la conception, la simulation et la réalisation de solutions nanophotoniques nouvelles pour de futures cellules solaires cristallines ultrafines.Dans un premier temps, nous nous sommes engagé dans une approche en rupture avec la conception habituelle des cellules solaires pour piéger la lumière dans une cellule ultrafine (≤100 nm de matériaux couche-mince (GaAs, GaSb et CIGS). Nous proposons un réseau métallique nanostructuré placé en face avant de la cellule reportée sur un miroir métallique afin d'obtenir une absorption très élevée et multi-résonante, indépendante de l’angle d’incidence et de la polarisation. Une analyse numérique approfondie des mécanismes résonants en jeu a été menée ainsi que la fabrication et la caractérisation optique de démonstrateurs. Les résultats de cette étude sont motivants pour des travaux futurs sur les dispositifs ultrafins, mettant en jeu de nouveaux concepts de collection (transport balistique) ou de conversion (cellules solaires à porteurs chauds).Dans un deuxième temps, nous avons étudié la possibilité d’intégrer à court terme un contact arrière nanostructuré en or à des cellules solaires fines (200-400 nm) en CIGS afin d’augmenter potentiellement le courant de court-circuit et la tension de circuit ouvert. Nous avons proposé un procédé innovant pour réaliser cette structure et ce piégeage optique, jusqu’à lors inédits pour les cellules en CIGS. Etude numérique, fabrications de démonstrateurs et premières caractérisations de cellules solaires ultrafines sont présentés.

One of the natural tendencies of photovoltaic technologies is the systematic reduction of the thickness of the solar cells in order to reduce the cost, to save rare or toxic elements or to limit recombination. So far, crystalline thin-film (GaAs) and poly-crystalline (CIGS) technology are reaching optimum conversion efficiency for thicknesses around 1 or 2 microns. Typically, this thickness range does not require new solutions of optical trappings as it is the case for amorphous silicon. However, if we want to reduce these thicknesses by a factor of 10 or even…

Advisors/Committee Members: Pelouard, Jean-Luc (thesis director), Guillemoles, Jean-François (thesis director).

Subjects/Keywords: Cellules solaires; Piégeage optique; Nanophotonique; Plasmonique; Solar cells; Light trapping; Nanophotonic; Plasmonic

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Colin, C. (2013). Metallic nano-structures for light-trapping in ultra-thin GaAs and CIGS solar cells : Nano-structures métalliques pour du piégeage optique dans des cellules solaires ultra-fines à base de GaAs et de CIGS. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2013PA112305

Chicago Manual of Style (16^th Edition):

Colin, Clément. “Metallic nano-structures for light-trapping in ultra-thin GaAs and CIGS solar cells : Nano-structures métalliques pour du piégeage optique dans des cellules solaires ultra-fines à base de GaAs et de CIGS.” 2013. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed March 06, 2021. http://www.theses.fr/2013PA112305.

MLA Handbook (7^th Edition):

Colin, Clément. “Metallic nano-structures for light-trapping in ultra-thin GaAs and CIGS solar cells : Nano-structures métalliques pour du piégeage optique dans des cellules solaires ultra-fines à base de GaAs et de CIGS.” 2013. Web. 06 Mar 2021.

Vancouver:

Colin C. Metallic nano-structures for light-trapping in ultra-thin GaAs and CIGS solar cells : Nano-structures métalliques pour du piégeage optique dans des cellules solaires ultra-fines à base de GaAs et de CIGS. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2013. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2013PA112305.

Council of Science Editors:

Colin C. Metallic nano-structures for light-trapping in ultra-thin GaAs and CIGS solar cells : Nano-structures métalliques pour du piégeage optique dans des cellules solaires ultra-fines à base de GaAs et de CIGS. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2013. Available from: http://www.theses.fr/2013PA112305

University of Toronto

27. Montazeri, Okhtay Arthur. Hyperspectral Light-trapping within Graded Gratings Using Adiabatically Coupled Plasmonic Waveguide-Resonators.

Degree: PhD, 2016, University of Toronto

URL: http://hdl.handle.net/1807/80395

► Rainbow-trapping or slowing down broadband electromagnetic radiation over a subwavelength grating, provides new opportunities for light-matter interaction on a nanometer scale. Previous efforts have shown… (more)

▼ Rainbow-trapping or slowing down broadband electromagnetic radiation over a subwavelength grating, provides new opportunities for light-matter interaction on a nanometer scale. Previous efforts have shown rainbow-trapping is possible on functionally graded structures. Here, a new gradient parameter is proposed for designing rainbow-trapping gratings, which takes advantage of the close correlation between the groove-width and the overlap of the evanescent fields within the grooves. In the suitable range (~150 nm), this width parameter is as important as other known variables such as groove depth and materials composition, but with the added advantage that tailoring groove widths is remarkably more feasible in practice. This is shown to be the case through nanofabrication techniques described in this dissertation. The effect of groove-width on the dispersion relation of the nano-groove is studied, resulting in an analytical solution for the effective index of the groove. Adjusting this effective index through the width-parameter establishes the basis for the graded-index gratings discussed herein, where groove-widths are tapered across the grooves of a grating. Accordingly, using groove-width as a design parameter gives rise to rainbow-trapping in linear, as well as other geometries such as bullâ s eye type structures. Furthermore, the extension of graded gratings to other geometries such as cylindrical and spiky spherical nanoparticles is studied through transformation optics. The case of spiky nanoparticles with a tapered spike geometry is closely examined through Multiphysics simulations to predict the thermal effects of light-matter interaction in pico- and nanosecond timescales, as well as experiments conducted under continuous wave conditions. Using gold nanoparticles with diameters of (â ź30-100 nm) and various spike aspect-ratios, enables exploiting both the plasmonic resonance of the spherical particle (Mie resonance), as well as the plasmons contributed and guided by the graded geometry of the spikes. The interaction of these two types of resonances results in an unprecedented and high-resolution control of the plasmonic field distribution and temperature profile This deeply sub-wavelength heat control allows the scalable genesis of self-dressing nanoparticles in a thermally triggered precursor of the shell under controllable laser illumination. The result is nanoparticles with controllable partial shell-formation, where the tips of gold spikes are left exposed. This is in contrast to the blanket coverage of the particle that can lead to mode suppression, by blocking lightâ s access to the spikes which are responsible for light-coupling to surface plasmons. The derived analytical formula obtained through treating each nano-groove as a plasmonic waveguide resonator is compared with simulations, and near-field optical measurements in the visible and infrared regions. These results closely agree with numerical simulations,… Advisors/Committee Members: Kherani, Nazir P, Electrical and Computer Engineering.

Subjects/Keywords: graded gratings; Light-trapping; plasmonic gratings; Plasmonics; Subwavelength gratings; super-resolution; 0565

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Montazeri, O. A. (2016). Hyperspectral Light-trapping within Graded Gratings Using Adiabatically Coupled Plasmonic Waveguide-Resonators. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/80395

Chicago Manual of Style (16^th Edition):

Montazeri, Okhtay Arthur. “Hyperspectral Light-trapping within Graded Gratings Using Adiabatically Coupled Plasmonic Waveguide-Resonators.” 2016. Doctoral Dissertation, University of Toronto. Accessed March 06, 2021. http://hdl.handle.net/1807/80395.

MLA Handbook (7^th Edition):

Montazeri, Okhtay Arthur. “Hyperspectral Light-trapping within Graded Gratings Using Adiabatically Coupled Plasmonic Waveguide-Resonators.” 2016. Web. 06 Mar 2021.

Vancouver:

Montazeri OA. Hyperspectral Light-trapping within Graded Gratings Using Adiabatically Coupled Plasmonic Waveguide-Resonators. [Internet] [Doctoral dissertation]. University of Toronto; 2016. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1807/80395.

Council of Science Editors:

Montazeri OA. Hyperspectral Light-trapping within Graded Gratings Using Adiabatically Coupled Plasmonic Waveguide-Resonators. [Doctoral Dissertation]. University of Toronto; 2016. Available from: http://hdl.handle.net/1807/80395

University of Arizona

28. Zhang, Deming. Holographic Spectrum-Splitting Optical Systems for Solar Photovoltaics .

Degree: 2013, University of Arizona

URL: http://hdl.handle.net/10150/301498

► Solar energy is the most abundant source of renewable energy available. The relatively high cost prevents solar photovoltaic (PV) from replacing fossil fuel on a… (more)

▼ Solar energy is the most abundant source of renewable energy available. The relatively high cost prevents solar photovoltaic (PV) from replacing fossil fuel on a larger scale. In solar PV power generation the cost is reduced with more efficient PV technologies. In this dissertation, methods to improve PV conversion efficiency with holographic optical components are discussed. The tandem multiple-junction approach has achieved very high conversion efficiency. However it is impossible to manufacture tandem PV cells at a low cost due to stringent fabrication standards and limited material types that satisfy lattice compatibility. Current produced by the tandem multi-junction PV cell is limited by the lowest junction due to series connection. Spectrum-splitting is a lateral multi-junction concept that is free of lattice and current matching constraints. Each PV cell can be optimized towards full absorption of a spectral band with tailored light-trapping schemes. Holographic optical components are designed to achieve spectrum-splitting PV energy conversion. The incident solar spectrum is separated onto multiple PV cells that are matched to the corresponding spectral band. Holographic spectrum-splitting can take advantage of existing and future low-cost technologies that produces high efficiency thin-film solar cells. Spectrum-splitting optical systems are designed and analyzed with both transmission and reflection holographic optical components. Prototype holograms are fabricated and high optical efficiency is achieved. Light-trapping in PV cells increases the effective optical path-length in the semiconductor material leading to improved absorption and conversion efficiency. It has been shown that the effective optical path length can be increased by a factor of 4n2 using diffusive surfaces. Ultra-light-trapping can be achieved with optical filters that limit the escape angle of the diffused light. Holographic reflection gratings have been shown to act as angle-wavelength selective filters that can function as ultra-light-trapping filters. Results from an experimental reflection hologram are used to model the absorption enhancement factor for a silicon solar cell and light-trapping filter. The result shows a significant improvement in current generation for thin-film silicon solar cells under typical operating conditions. Advisors/Committee Members: Kostuk, Raymond K (advisor), Melde, Kathleen L. (committeemember), Potter, Kelly S. (committeemember), Gehm, Michael E. (committeemember), Kostuk, Raymond K. (committeemember).

Subjects/Keywords: light trapping; solar energy; spectrum splitting; Electrical & Computer Engineering; holographic optical component

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Zhang, D. (2013). Holographic Spectrum-Splitting Optical Systems for Solar Photovoltaics . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/301498

Chicago Manual of Style (16^th Edition):

Zhang, Deming. “Holographic Spectrum-Splitting Optical Systems for Solar Photovoltaics .” 2013. Doctoral Dissertation, University of Arizona. Accessed March 06, 2021. http://hdl.handle.net/10150/301498.

MLA Handbook (7^th Edition):

Zhang, Deming. “Holographic Spectrum-Splitting Optical Systems for Solar Photovoltaics .” 2013. Web. 06 Mar 2021.

Vancouver:

Zhang D. Holographic Spectrum-Splitting Optical Systems for Solar Photovoltaics . [Internet] [Doctoral dissertation]. University of Arizona; 2013. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10150/301498.

Council of Science Editors:

Zhang D. Holographic Spectrum-Splitting Optical Systems for Solar Photovoltaics . [Doctoral Dissertation]. University of Arizona; 2013. Available from: http://hdl.handle.net/10150/301498

University of Maryland

29. Murray, Joseph. EXPERIMENTAL DEMONSTRATION OF LIGHT TRAPPING AND INTERNAL LIGHT SCATTERING IN SOLAR CELLS.

Degree: Electrical Engineering, 2016, University of Maryland

URL: http://hdl.handle.net/1903/18757

► Renewable energy technologies have long-term economic and environmental advantages over fossil fuels, and solar power is the most abundant renewable resource, supplying 120 PW over… (more)

▼ Renewable energy technologies have long-term economic and environmental advantages over fossil fuels, and solar power is the most abundant renewable resource, supplying 120 PW over earth’s surface. In recent years the cost of photovoltaic modules has reached grid parity in many areas of the world, including much of the USA. A combination of economic and environmental factors has encouraged the adoption of solar technology and led to an annual growth rate in photovoltaic capacity of 76% in the US between 2010 and 2014. Despite the enormous growth of the solar energy industry, commercial unit efficiencies are still far below their theoretical limits. A push for thinner cells may reduce device cost and could potentially increase device performance. Fabricating thinner cells reduces bulk recombination, but at the cost of absorbing less light. This tradeoff generally benefits thinner devices due to reduced recombination. The effect continues up to a maximum efficiency where the benefit of reduced recombination is overwhelmed by the suppressed absorption. Light trapping allows the solar cell to circumvent this limitation and realize further performance gains (as well as continue cost reduction) from decreasing the device thickness. This thesis presents several advances in experimental characterization, theoretical modeling, and device applications for light trapping in thin-film solar cells. We begin by introducing light trapping strategies and discuss theoretical limits of light trapping in solar cells. This is followed by an overview of the equipment developed for light trapping characterization. Next we discuss our recent work measuring internal light scattering and a new model of scattering to predict the effects of dielectric nanoparticle back scatterers on thin-film device absorption. The new model is extended and generalized to arbitrary stacks of stratified media containing scattering structures. Finally, we investigate an application of these techniques using polymer dispersed liquid crystals to produce switchable solar windows. We show that these devices have the potential for self-powering. Advisors/Committee Members: Munday, Jeremy N (advisor).

Subjects/Keywords: Alternative energy; Optics; Electromagnetics; Light Trapping; Modelling; Optics; PDLC; Solar Energy; Solar Window

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Murray, J. (2016). EXPERIMENTAL DEMONSTRATION OF LIGHT TRAPPING AND INTERNAL LIGHT SCATTERING IN SOLAR CELLS. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/18757

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):

Murray, Joseph. “EXPERIMENTAL DEMONSTRATION OF LIGHT TRAPPING AND INTERNAL LIGHT SCATTERING IN SOLAR CELLS.” 2016. Thesis, University of Maryland. Accessed March 06, 2021. http://hdl.handle.net/1903/18757.

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

MLA Handbook (7^th Edition):

Murray, Joseph. “EXPERIMENTAL DEMONSTRATION OF LIGHT TRAPPING AND INTERNAL LIGHT SCATTERING IN SOLAR CELLS.” 2016. Web. 06 Mar 2021.

Vancouver:

Murray J. EXPERIMENTAL DEMONSTRATION OF LIGHT TRAPPING AND INTERNAL LIGHT SCATTERING IN SOLAR CELLS. [Internet] [Thesis]. University of Maryland; 2016. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1903/18757.

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

Council of Science Editors:

Murray J. EXPERIMENTAL DEMONSTRATION OF LIGHT TRAPPING AND INTERNAL LIGHT SCATTERING IN SOLAR CELLS. [Thesis]. University of Maryland; 2016. Available from: http://hdl.handle.net/1903/18757

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

30. Xu, Yunlu. PHOTONIC ENGINEERING OF ABSORPTION AND EMISSION IN PHOTOVOLTAICS.

Degree: Electrical Engineering, 2016, University of Maryland

URL: http://hdl.handle.net/1903/19046

► As modern society advances, the demand for clean and renewable energy resources becomes more and more important. The sun is by far the most abundant… (more)

▼ As modern society advances, the demand for clean and renewable energy resources becomes more and more important. The sun is by far the most abundant source of renewable energy and is indirectly responsible for many other energy resources on earth (e.g. sunlight enables photosynthesis, biofuels, wind, and even carbon-based fuels). A solar cell directly converts the energy of solar illumination into electricity through the photovoltaic effect and is expected to play a crucial role in the future total power generation globally. Our work has focused on photonic approaches to improving the conversion efficiency of solar cells. Toward this goal, we present results describing the use of quantum dot emission to redirect light within a solar cell, as well as the modification of absorption and emission of light from a solar cell using nanostructures and thin films to increase the efficiency to approach (or possibly surpass) the currently understood efficiency limits for traditional devices. The Shockley-Queisser (SQ) limit describes the maximum solar power conversion efficiency achievable for a p-n junction composed of a particular material and is the standard by which new photovoltaic technologies are compared. This limit is based on the principle of detailed balance, which equates the photon flux into a device to the particle flux (photons or electrons) out of that device. Based on this theory, we describe how the efficiency of a photovoltaic cell is altered in the presence of new anti-reflection coatings, nanotexturing (e.g. plasmonic nanoparticle, nanowire), and more advanced photonic structures (e.g. photonic crystals) that are capable of modifying the absorption and emission of photons. Nanostructured solar cells represent a novel class of photovoltaic devices. By careful selection of materials, as well as particle shapes and positions, the device performance can be improved by increasing the optical path length for scattered light, improving the modal distribution of the light within the absorber, and increasing light concentration (or angle restriction). For example, nanowires can yield microscale concentration effects to improve device performance; however, it has been unclear whether or not they can exceed the Shockley-Queisser limit. We show that single-junction nanostructured solar cells have a theoretical maximum efficiency of ∼ 42% under AM 1.5 solar illumination. While this exceeds the efficiency of a non-concentrating planar device, it does not exceed the Shockley-Queisser limit for a planar device with optical concentration. For practical devices, we include the effect of diffuse illumination and find that with the modest optical concentration available from nanostructures (× 1,000), an efficiency of 35.5% is achievable even with 25% diffusive solar radiation. Finally, we discuss how photon emission modification offers an approach for low bandgap materials to achieve higher efficiencies. By incorporating specifically designed photonic structures that restrict the absorption and emission of above bandgap… Advisors/Committee Members: Munday, Jeremy N (advisor).

Subjects/Keywords: Electrical engineering; Energy; Physics; Bandgap shift; Light trapping; Photonic crystal; Photovoltaics; Quantum dot; Semiconductor

11 more images…

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Xu, Y. (2016). PHOTONIC ENGINEERING OF ABSORPTION AND EMISSION IN PHOTOVOLTAICS. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/19046

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):

Xu, Yunlu. “PHOTONIC ENGINEERING OF ABSORPTION AND EMISSION IN PHOTOVOLTAICS.” 2016. Thesis, University of Maryland. Accessed March 06, 2021. http://hdl.handle.net/1903/19046.

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

MLA Handbook (7^th Edition):

Xu, Yunlu. “PHOTONIC ENGINEERING OF ABSORPTION AND EMISSION IN PHOTOVOLTAICS.” 2016. Web. 06 Mar 2021.

Vancouver:

Xu Y. PHOTONIC ENGINEERING OF ABSORPTION AND EMISSION IN PHOTOVOLTAICS. [Internet] [Thesis]. University of Maryland; 2016. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1903/19046.

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

Council of Science Editors:

Xu Y. PHOTONIC ENGINEERING OF ABSORPTION AND EMISSION IN PHOTOVOLTAICS. [Thesis]. University of Maryland; 2016. Available from: http://hdl.handle.net/1903/19046

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

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations