subject:(Charge transport)

Wake Forest University

1. Mei, Yaochuan. CHARGE TRANSPORT IN ORGANIC AND HYBRID PEROVSKITE FIELD EFFECT TRANSISTORS.

Degree: 2016, Wake Forest University

► Organic semiconductors and hybrid organic/inorganic perovskite semiconductors can address new applications, which are off-limits for conventional silicon-based electronics. We fabricate organic field-effect transistors (OFETs) and… (more)

Subjects/Keywords: charge transport

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APA (6^th Edition):

Mei, Y. (2016). CHARGE TRANSPORT IN ORGANIC AND HYBRID PEROVSKITE FIELD EFFECT TRANSISTORS. (Thesis). Wake Forest University. Retrieved from http://hdl.handle.net/10339/59262

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):

Mei, Yaochuan. “CHARGE TRANSPORT IN ORGANIC AND HYBRID PEROVSKITE FIELD EFFECT TRANSISTORS.” 2016. Thesis, Wake Forest University. Accessed February 27, 2021. http://hdl.handle.net/10339/59262.

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

MLA Handbook (7^th Edition):

Mei, Yaochuan. “CHARGE TRANSPORT IN ORGANIC AND HYBRID PEROVSKITE FIELD EFFECT TRANSISTORS.” 2016. Web. 27 Feb 2021.

Vancouver:

Mei Y. CHARGE TRANSPORT IN ORGANIC AND HYBRID PEROVSKITE FIELD EFFECT TRANSISTORS. [Internet] [Thesis]. Wake Forest University; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10339/59262.

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

Council of Science Editors:

Mei Y. CHARGE TRANSPORT IN ORGANIC AND HYBRID PEROVSKITE FIELD EFFECT TRANSISTORS. [Thesis]. Wake Forest University; 2016. Available from: http://hdl.handle.net/10339/59262

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

University of Alberta

2. Olson, Steven. Charge transport in molecular junctions and microfluidic devices.

Degree: MS, Department of Physics, 2010, University of Alberta

URL: https://era.library.ualberta.ca/files/gx41mj807

► Electro-transmittance of molecular junctions was characterized electrically and studied optically at 410nm and 532nm. Between 1kHz and 100kHz there was no qualitative difference between the… (more)

Subjects/Keywords: microfluidic; molecular junctions; charge transport

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APA (6^th Edition):

Olson, S. (2010). Charge transport in molecular junctions and microfluidic devices. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/gx41mj807

Chicago Manual of Style (16^th Edition):

Olson, Steven. “Charge transport in molecular junctions and microfluidic devices.” 2010. Masters Thesis, University of Alberta. Accessed February 27, 2021. https://era.library.ualberta.ca/files/gx41mj807.

MLA Handbook (7^th Edition):

Olson, Steven. “Charge transport in molecular junctions and microfluidic devices.” 2010. Web. 27 Feb 2021.

Vancouver:

Olson S. Charge transport in molecular junctions and microfluidic devices. [Internet] [Masters thesis]. University of Alberta; 2010. [cited 2021 Feb 27]. Available from: https://era.library.ualberta.ca/files/gx41mj807.

Council of Science Editors:

Olson S. Charge transport in molecular junctions and microfluidic devices. [Masters Thesis]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/gx41mj807

Colorado School of Mines

3. Schloemer, Tracy H. Organic semiconductor design for increased performance and stability of perovskite solar cells.

Degree: PhD, Chemistry, 2019, Colorado School of Mines

URL: http://hdl.handle.net/11124/173980

► Perovskite solar cells (PSCs) have received considerable attention due to the absorbing layer’s excellent semiconducting properties and simple deposition methods that allow for impressive device-level… (more)

▼ Perovskite solar cells (PSCs) have received considerable attention due to the absorbing layer’s excellent semiconducting properties and simple deposition methods that allow for impressive device-level efficiencies at potentially much lower cost than state-of-the-art technologies. Most PSCs use organic hole- and electron-transport materials for highly efficient devices. While many organic charge-transport materials used allow for high device-level efficiencies, they often are the bottleneck with regard to thermal stability in the context of the materials in the entire device stack. This dissertation primarily describes the design, synthesis, purification, and characterization of new charge-transport materials and dopants to develop molecular structure and performance relationships for application in highly durable PSCs. Our current hole-transport layer (HTL) research focuses on developing both hole-transport materials and dopants. HTL design is one method with a high return on investment for PSC stability and lifetime. We found radical triarylamine salts as dopants must contain two electron-donating groups para to the triarylamine to prevent dimerization that renders the dopant ineffective. A stable dopant combined with a triarylamine-based, high glass-transition temperature HTM allows for improved device-level stability at elevated temperatures (50 C). To extend this system to further improve device-level properties, HTMs with thiomethyl substituents for perovskite active layer (PAL) passivation and cross-linkable HTMs were synthesized and characterized with the aim to improve device-level efficiency and operational stability at elevated temperatures respectively. Upon device-level optimization, these routes were not ultimately achieved due to unexpected fabrication considerations. With regard to electron-transport layers (ETLs), naphthalene diimide-based (NDI) materials have recently emerged as a potential competitor for C60, the state-of-the-art organic ETL due to their impressive morphological stability and intrinsic electron mobilities. Due to poor solubility in solvents orthogonal to the perovskite active layer, NDIs are not compatible with solution-processing. A library of NDI-based ETLs was synthesized and characterized for improved solubility and frontier orbital energetic alignment with a variety of PALs. Optoelectronic properties were characterized which show successful frontier molecular orbital energetic tuning. Structural motifs for moderately improved solubility in desired solvents were also identified. The PAL contains a number of species that can participate in a variety of chemical reactions (e.g., Brønsted acidic organic species like methylamine, redox active halides, etc.). The organic charge-transport layers must survive these conditions during device operation. Little work has been done to develop design criteria for charge-transport materials based upon compatibility with the PAL. Towards this end, perovskite precursor ink impurities were identified and characterized. Acid-base reactions… Advisors/Committee Members: Sellinger, Alan (advisor), Knauss, Daniel M. (committee member), Domaille, Dylan (committee member), Rockett, A. (Angus) (committee member).

Subjects/Keywords: dopants; charge-transport; organic semiconductors

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APA (6^th Edition):

Schloemer, T. H. (2019). Organic semiconductor design for increased performance and stability of perovskite solar cells. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/173980

Chicago Manual of Style (16^th Edition):

Schloemer, Tracy H. “Organic semiconductor design for increased performance and stability of perovskite solar cells.” 2019. Doctoral Dissertation, Colorado School of Mines. Accessed February 27, 2021. http://hdl.handle.net/11124/173980.

MLA Handbook (7^th Edition):

Schloemer, Tracy H. “Organic semiconductor design for increased performance and stability of perovskite solar cells.” 2019. Web. 27 Feb 2021.

Vancouver:

Schloemer TH. Organic semiconductor design for increased performance and stability of perovskite solar cells. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11124/173980.

Council of Science Editors:

Schloemer TH. Organic semiconductor design for increased performance and stability of perovskite solar cells. [Doctoral Dissertation]. Colorado School of Mines; 2019. Available from: http://hdl.handle.net/11124/173980

University of Cambridge

4. Chen, Cheng. Thermoelectric and Charge Transport in Doped Semi-Crystalline Polymers.

Degree: PhD, 2020, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/307711

► In recent years, organic semiconductors (OSCs) have generated many research interests from both academia and industry due to the exotic properties and potential applications in… (more)

▼ In recent years, organic semiconductors (OSCs) have generated many research interests from both academia and industry due to the exotic properties and potential applications in flexible displays, light-emitting diodes, solar cells as well as thermoelectrics. Compared with their inorganic counterparts, OSCs have several advantageous features including low cost, lightweight, mechanically robustness, ease of synthesis and tailoring material properties, environmental friendless, flexibility. For many of the mentioned applications, OSCs are doped to improve the conductivity. This is particularly important to improving the thermoelectric performance of OSCs and the figure of merit ZT. However, another equally important parameter, the Seebeck coefficient, tends to decrease when carrier concentration and conductivity increase. Therefore, it is crucial to find a balanced point where ZT maximizes. To achieve this, it is paramount to understand charge and entropy transport as well as the related key parameters affecting the electrical and thermoelectric properties in doped OSCs. Herein, doped poly(2,5-bis(3-tetradecylthiophen2-yl)thieno-[3,2-b]thiophene), PBTTT and its derivates are selected in this thesis for the investigation of thermoelectric and charge transport in highly conducting polymers. An unprecedented doping regime can be achieved via ion-exchange doping method, which is already approaching the metal-insulator (M-I) transition. The enhanced charge delocalization has been evidenced by the systematic spectroscopic as well as transport studies for samples with a broad range of conductivities. The clear Hall effect has been detected by a high-resolution ac Hall set-up, with the heavily doped sample showing a temperature-independent Hall coefficient, which indicates nearly "ideal" band-like transport. The temperature dependences of conductivity and Seebeck coefficient for samples at different doping levels witness the onset of metallic states evolved from pure hopping transport. The Seebeck coefficient over a wide range of conductivity can be analyzed by a model that accounts for the energy dependence of the transport function and show a transition from an exponent s=3 to s=1 or 2. Such a transition also correlates to the point where power factor maximizes. We correlate these observed transport phenomena for ion-exchange doped PBTTT with microstructural ordering as function of increasing doping levels, as supported by the diffraction data. Moreover, side-chain modification and chalcogen substitution have been established to affect the properties of semiconducting organic materials. In this thesis, we also investigate their effects on doping as well as electrical and thermoelectric properties. The adopted polar side chain modification with alkoxy and glycol groups was verified to give more efficient doping but show an adverse effect on thermoelectric and electrical performance. Intriguingly, the introduction of single chalcogen atom into the polymer backbone, which is believed to enhance the interchain interaction, gives…

Subjects/Keywords: Organic thermoelectrics; Doping; Charge transport

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APA (6^th Edition):

Chen, C. (2020). Thermoelectric and Charge Transport in Doped Semi-Crystalline Polymers. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/307711

Chicago Manual of Style (16^th Edition):

Chen, Cheng. “Thermoelectric and Charge Transport in Doped Semi-Crystalline Polymers.” 2020. Doctoral Dissertation, University of Cambridge. Accessed February 27, 2021. https://www.repository.cam.ac.uk/handle/1810/307711.

MLA Handbook (7^th Edition):

Chen, Cheng. “Thermoelectric and Charge Transport in Doped Semi-Crystalline Polymers.” 2020. Web. 27 Feb 2021.

Vancouver:

Chen C. Thermoelectric and Charge Transport in Doped Semi-Crystalline Polymers. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Feb 27]. Available from: https://www.repository.cam.ac.uk/handle/1810/307711.

Council of Science Editors:

Chen C. Thermoelectric and Charge Transport in Doped Semi-Crystalline Polymers. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://www.repository.cam.ac.uk/handle/1810/307711

5. Rettie, Alexander John. Metal oxide photoelectrodes for solar water splitting.

Degree: PhD, Chemical engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/32336

► Efficient solar water splitting – using sunlight to produce hydrogen from water – has been an ambitious goal of the scientific community for over 40… (more)

▼ Efficient solar water splitting – using sunlight to produce hydrogen from water – has been an ambitious goal of the scientific community for over 40 years. At its heart this is a materials problem, with the photoelectrodes used in a photoelectrochemical cell having to satisfy all the constraints of a photovoltaic material (light absorption, charge transport) as well as being stable in water and having appropriately positioned band edges. Of the metal oxide systems studied for this purpose, we identified iron oxide (hematite, α-Fe2O3), tungsten trioxide (WO3) and an emerging (at the time) material, bismuth vanadate (BiVO4) as the most promising. In this dissertation we sought to understand and address the shortcomings of these materials, namely, carrier transport in BiVO4 and α-Fe2O3 and light absorption in WO3. We synthesized high quality single crystals of undoped and Mo and W-doped BiVO4 using the floating zone technique and carried out fundamental transport measurements. Electrons were shown to form small polarons and the Hall effect mobility was low, ~10-1 cm2 V-1 s-1 at 300 K. Critically, the mobility measured by the Hall effect may be vastly different from the drift mobility. Small-polaron hopping was found to be in the adiabatic regime and anisotropic conductivity was related to the structural arrangement of vanadium ions. Electrons are also thought to form small polarons in α-Fe2O3, but a thorough analysis had not been performed. We grew single crystals of Ti:α-Fe2O3 and characterized their electron transport to evaluate this model and probe the large anisotropy thought to occur between the basal planes. These revealed that the adiabatic small-polaron model was appropriate. Interestingly, electron transport in Ti:α-Fe2O3 was shown to be near-isotropic, contradicting the common view in the literature. Finally, we studied the effects of sulfur or iodine incorporation in WO3 with the aim to improve its visible light harvesting ability. Both of these impurities did increase visible light absorption, but performance was degraded in all cases except for very low concentrations of sulfur doping. These impurities likely form inter-gap defect bands which allow the absorption of longer wavelength light, but also degrade transport properties if present in large amounts. Advisors/Committee Members: Mullins, C. B. (advisor), Bard, Allen J (committee member), Humphrey, Simon M (committee member), Hwang, Gyeong S (committee member), Korgel, Brian A (committee member).

Subjects/Keywords: Metal oxide; Charge transport; Photoelectrochemistry

11 more images…

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APA (6^th Edition):

Rettie, A. J. (2015). Metal oxide photoelectrodes for solar water splitting. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32336

Chicago Manual of Style (16^th Edition):

Rettie, Alexander John. “Metal oxide photoelectrodes for solar water splitting.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed February 27, 2021. http://hdl.handle.net/2152/32336.

MLA Handbook (7^th Edition):

Rettie, Alexander John. “Metal oxide photoelectrodes for solar water splitting.” 2015. Web. 27 Feb 2021.

Vancouver:

Rettie AJ. Metal oxide photoelectrodes for solar water splitting. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2152/32336.

Council of Science Editors:

Rettie AJ. Metal oxide photoelectrodes for solar water splitting. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/32336

University of Texas – Austin

6. Danielson, Eric Lewis. Lateral device techniques for characterizing organic bulk heterojunction photovoltaic materials.

Degree: PhD, Materials Science and Engineering, 2014, University of Texas – Austin

URL: http://hdl.handle.net/2152/27144

► This work is focused on developing novel techniques for characterizing organic bulk heterojunction (BHJ) materials for organic photovoltaic (OPV) applications. Polymer:fullerene BHJs are a promising… (more)

▼ This work is focused on developing novel techniques for characterizing organic bulk heterojunction (BHJ) materials for organic photovoltaic (OPV) applications. Polymer:fullerene BHJs are a promising class of photovoltaic materials, but an improved understanding of the charge transport processes and materials science of BHJs is required for them to effectively compete with other photovoltaic systems. Key parameters of BHJ systems that need to be evaluated include both electron and hole mobilities, the carrier concentrations, the recombination mechanism and the recombination coefficient. For these studies, poly(3-hexylthiophene) (P3HT):(6,6)-phenyl C₆₁-butyric acid methyl ester (PCBM) have been characterized due to its wide use among researchers. Traditional characterization techniques have focused on transient measurements in a vertical device configuration, but we demonstrate the use of lateral BHJ devices as materials diagnostic platforms. Lateral devices allow for direct access to the active layer for spatially resolved and environmental effect measurements. The devices are also measured under steady state operation, similar to a working OPV cell. Under these conditions, lateral BHJ devices exhibit space charge limited transport behavior. A detailed charge transport model is presented to describe the potential, electric field, and carrier concentration profiles of lateral BHJ devices, as well as the current versus voltage characteristics of different regions of the device. We are able to calculate the slower carrier mobility from photocurrent measurements of lateral devices and the carrier mobility ratio from the device potential profile, even in ambipolar BHJ systems. In situ potentiometry is used to construct detailed potential profiles of the device channel and calculate both carrier mobilities. The carrier concentration and recombination coefficient are calculated from lateral conductivity measurements, and we show that bimolecular recombination is the dominant mechanism in bulk P3HT:PCBM. A simplified in situ potentiometry and photocurrent measurement technique is presented to measure the time evolution of organic BHJ performance. Due to the open geometry of the lateral BHJ device, we are also able to monitor the change in key charge transport parameters, including the recombination mechanism, in response to environmental degradation, analyte exposure, and ambient temperature. We show increased geminate recombination in P3HT:PC₇₁BM after prolonged light exposure. Lateral BHJ device measurements offer a useful complement to measurements on vertical photovoltaic structures and provide a more complete and detailed picture of OPV materials. Advisors/Committee Members: Dodabalapur, Ananth, 1963- (advisor).

Subjects/Keywords: Organic photovoltaics; Charge transport

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APA (6^th Edition):

Danielson, E. L. (2014). Lateral device techniques for characterizing organic bulk heterojunction photovoltaic materials. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/27144

Chicago Manual of Style (16^th Edition):

Danielson, Eric Lewis. “Lateral device techniques for characterizing organic bulk heterojunction photovoltaic materials.” 2014. Doctoral Dissertation, University of Texas – Austin. Accessed February 27, 2021. http://hdl.handle.net/2152/27144.

MLA Handbook (7^th Edition):

Danielson, Eric Lewis. “Lateral device techniques for characterizing organic bulk heterojunction photovoltaic materials.” 2014. Web. 27 Feb 2021.

Vancouver:

Danielson EL. Lateral device techniques for characterizing organic bulk heterojunction photovoltaic materials. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2014. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2152/27144.

Council of Science Editors:

Danielson EL. Lateral device techniques for characterizing organic bulk heterojunction photovoltaic materials. [Doctoral Dissertation]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/27144

7. Champlain, Amandine. Étude de la dynamique des poussières lunaires et de leur impact sur les systèmes d'exploration : Study of lunar dust dynamic and of their impact on exploration systems.

Degree: Docteur es, Photonique et systèmes optoélectroniques, 2016, Toulouse, ISAE

URL: http://www.theses.fr/2016ESAE0041

►

L’exploration lunaire représente une part importante de l'activité des agences spatiales nationales. Les scientifiques se sont intéressés aux interactions de la surface lunaire avec le… (more)

▼

L’exploration lunaire représente une part importante de l'activité des agences spatiales nationales. Les scientifiques se sont intéressés aux interactions de la surface lunaire avec le plasma environnant et les appareils envoyés sur place. Les observations ont mis en évidence la présence de régolithe, formant une épaisse couche de poussières à la surface, et il a été constaté que ces particules sont très abrasives et tranchantes. Elles représentent un risque matériel important pour les équipements envoyés sur la Lune et la nécessité de comprendre les origines de leur transport est incontournable pour le bon déroulement des futures missions. Le mouvement de ces poussières peut, entre autres, être issu de phénomènes électrostatiques, particulièrement présents aux frontières ombre/lumière. Les observations d'un nuage de poussières au-dessus de la surface lunaire en sont la preuve. Cependant, les mécanismes à l'origine de ce nuage sont peu connus. Il est donc nécessaire de comprendre les interactions entre les poussières et l'environnement lunaire afin de prévenir la pollution d'appareils se trouvant à la surface. L'objectif de la thèse est de comprendre et de modéliser la charge et le transport électrostatique des poussières aux interfaces ombre/lumière. Le dispositif DROP a été développé afin d'observer le transport électrostatique de poussières et permettre une compréhension physique de cette dynamique. Les tests effectués ont permis de dégager les paramètres les plus importants dans la dynamique des poussières. Ils ont également rendu possible l'adaptation d'un modèle numérique préexistant qui a été contraint afin de le rendre plus représentatif de la situation lunaire.

The lunar exploration represents a major part of all national space agencies activities. The scientists have studied the interactions of the lunar surface with the surrounding plasma but also with equipment sent on the lunar surface. Observations have shown the presence of regolith particles covering the surface of the Moon. This layer of dust grains can be several meters thick and these dust particles are very abrasive and adhesive. They are an important risk for equipment sent on the Moon. Thus, the understanding of the origins of dust grains transport is vital to successfully plan future missions. e lunar dust dynamics can be produced by electrostatic phenomena, especially at boundaries between shadowed and unlit regions. Observations of a dust Cloud above the lunar surface are evidence of this dynamic. However, the mechanisms causing this dust Cloud are unknown. It is thus necessary to understand the interactions between dust grains and the lunar environment in order to prevent the pollution of equipment on the lunar surface. The objective of this PhD thesis is the understanding and the modelling of dust particles charge and electrostatic transport near boundaries between shadow and light. An experimental device has been developed to observe dust grains electrostatic transport and to allow a physical understanding of this dynamic. The tests…

Advisors/Committee Members: Roussel, Jean-François (thesis director), Matéo-Vélez, Jean-Charles (thesis director).

Subjects/Keywords: Transport électrostatique; Charge; Poussières; Conductivité; Electrostatic transport; Charge; Dust; Conductivity; 621

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APA (6^th Edition):

Champlain, A. (2016). Étude de la dynamique des poussières lunaires et de leur impact sur les systèmes d'exploration : Study of lunar dust dynamic and of their impact on exploration systems. (Doctoral Dissertation). Toulouse, ISAE. Retrieved from http://www.theses.fr/2016ESAE0041

Chicago Manual of Style (16^th Edition):

Champlain, Amandine. “Étude de la dynamique des poussières lunaires et de leur impact sur les systèmes d'exploration : Study of lunar dust dynamic and of their impact on exploration systems.” 2016. Doctoral Dissertation, Toulouse, ISAE. Accessed February 27, 2021. http://www.theses.fr/2016ESAE0041.

MLA Handbook (7^th Edition):

Champlain, Amandine. “Étude de la dynamique des poussières lunaires et de leur impact sur les systèmes d'exploration : Study of lunar dust dynamic and of their impact on exploration systems.” 2016. Web. 27 Feb 2021.

Vancouver:

Champlain A. Étude de la dynamique des poussières lunaires et de leur impact sur les systèmes d'exploration : Study of lunar dust dynamic and of their impact on exploration systems. [Internet] [Doctoral dissertation]. Toulouse, ISAE; 2016. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2016ESAE0041.

Council of Science Editors:

Champlain A. Étude de la dynamique des poussières lunaires et de leur impact sur les systèmes d'exploration : Study of lunar dust dynamic and of their impact on exploration systems. [Doctoral Dissertation]. Toulouse, ISAE; 2016. Available from: http://www.theses.fr/2016ESAE0041

University of Saskatchewan

8. Simonson, Blaine M. X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors.

Degree: 2020, University of Saskatchewan

URL: http://hdl.handle.net/10388/12912

► Stabilized amorphous selenium (a-Se) photoconductive layers are currently used in most modern flat panel digital x-ray image detectors for mammography. The performance of these detectors… (more)

▼ Stabilized amorphous selenium (a-Se) photoconductive layers are currently used in most modern flat panel digital x-ray image detectors for mammography. The performance of these detectors depends, in part, on the electronic transport properties of the a-Se photoconductive layer. The transport properties consist of the charge carrier drift mobility μ and deep trapping time (lifetime) τ, of both electrons and holes in the photoconductive layer, which determine the x-ray sensitivity of the x-ray image detector through the charge collection efficiency. The product of a carrier’s drift mobility, lifetime, and the applied electric field μτF is the carrier schubweg, which refers to the average distance a charge carrier can travel in the photoconductive layer before it becomes trapped. Trapped carriers are not collected and cause a decrease in the charge collection efficiency and the x-ray sensitivity. The time-of-flight (TOF) and the interrupted-field time-of-flight (IFTOF) experimental techniques are used to measure the transport properties of both holes and electrons in a-Se layers. The TOF transient photoconductivity technique measures the transient photocurrent response of photoinjected charge carriers as they travel through a highly resistive sample under the influence of an electric field. The time width of the TOF pulse is directly related to the drift mobility of the carrier. The IFTOF technique interrupts the drift of the charge carriers through the sample by temporarily removing the electric field, which allows carriers to interact with deep traps in the bulk. The number of free carriers in the bulk decreases over the interruption time. When the electric field is reapplied the remaining free carriers resume drifting through the sample. The ratio of the recovered charge carriers before and after the interruption is related to the charge carrier deep trapping time (lifetime). The effects of high dose x-ray radiation of a-Se on the transport properties is examined. Stabilized amorphous selenium films, with a nominal composition of a-Se: 0.3% As + 10 ppm Cl, were fabricated through evaporation techniques. X-ray radiation was provided by an Al-filtered tungsten target x-ray tube. The absorbed dose rate was varied from 0.12 Gy/s - 2.5 Gy/s, the x-ray energy was varied from 50 kVp - 90 kVp (corresponding to a mean photon energy from 31.9 keV – 44.7 keV), and the applied electric field was varied from 0 V/μm - 10 V/μm. X-ray irradiation had no effect on the drift mobility of either holes or electrons. In the absence of an applied electric field it was found, for both electrons and holes, that reduction in the electron and hole lifetimes depended only on the total or accumulated dose D, absorbed in a-Se, and not on the rate of dose delivery or on the x-ray energy over the ranges examined. This allows the reduction in the carrier lifetimes to be simply modeled by τo/τ = 1 + AD, where τo is the lifetime before x-ray exposure (equilibrium lifetime), τ is the lifetime after exposure, D is the total absorbed dose, and A is a… Advisors/Committee Members: Kasap, Safa, Johanson, Robert, Dinh, Anh, Chen, Li, Bourassa, Adam.

Subjects/Keywords: Amorphous Selenium; X-ray Detector; Charge Transport; Charge Carrier Lifetime; X-ray damage to Charge Transport; Charge Collection Efficiency

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APA (6^th Edition):

Simonson, B. M. (2020). X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12912

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):

Simonson, Blaine M. “X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors.” 2020. Thesis, University of Saskatchewan. Accessed February 27, 2021. http://hdl.handle.net/10388/12912.

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

MLA Handbook (7^th Edition):

Simonson, Blaine M. “X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors.” 2020. Web. 27 Feb 2021.

Vancouver:

Simonson BM. X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors. [Internet] [Thesis]. University of Saskatchewan; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10388/12912.

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

Council of Science Editors:

Simonson BM. X-ray Induced Effects and Charge Collection Efficiency in Stabilized Amorphous Selenium Based X-ray Photoconductors. [Thesis]. University of Saskatchewan; 2020. Available from: http://hdl.handle.net/10388/12912

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

Vilnius Gediminas Technical University

9. Tolvaišienė, Sonata. Transport of charge carriers in ultrathin films of manganese oxides.

Degree: PhD, Physics, 2009, Vilnius Gediminas Technical University

URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143224-76401 ;

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The objective of this dissertation is to investigate lanthanum manganites, which exhibit colossal negative magnetoresistance and phase transitions from the paramagnetic state to the ferromagnetic… (more)

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The objective of this dissertation is to investigate lanthanum manganites, which exhibit colossal negative magnetoresistance and phase transitions from the paramagnetic state to the ferromagnetic state. The magnetoresistance and its ani-zotriopy of thin epitaxial manganite films at low (up to  0.5 T) magnetic fields, as well as effects induced by strong pulsed magnetic and electric fields were in-vestigated. It was demonstrated how it can be used in the development of magne-tic field sensors, short electric pulse forming devices and amplitude modulators. It was found that in the case of ultra-thin La-Sr-MnO3 films, the sign and value of the magnetoresistance anisotropy at low magnetic fields depends on the thickness of the films. An explanation of these results was proposed using the mean field approach and taking into consideration that the structure of the films changes with its thickness. A reversible thermoelectrical switching effect was discovered and investigated. A new method for nanosecond duration electrical pulses amplitude modulation by an external magnetic field using La0.87Sr0.17MnO3 films was suggested and experimentally verified. This dissertation consists of the abstracts in Lithuanian and English, intro-duction, six chapters, the main results and conclusions and list of literature. The introduction contains topicality and problem, the aim of the work, tasks, scientific novelty, practical value, approval of the results, statement to be de-fended and... [to full text]

Disertacijoje nagrinėjami lantano manganitai, pasižymintys faziniu virsmu iš paramagnetinės į feromagnetinę būseną bei milžiniškos neigiamos magnetovar-žos efektu. Tiriami magnetovaržos ir jos anizotropijos efektai silpnuose (iki  0,5 T) magnetiniuose laukuose bei stiprių impulsinių srovių ir magnetinių laukų sukelti efektai plonuose epitaksiniuose manganitų sluoksniuose. Pateikiami pasiūlymai tyrimo rezultatus panaudoti kuriant magnetinio lauko jutiklius, spar-čiųjų elektrinių impulsų formuotuvus bei amplitudės moduliatorius. Tiriant sil-pnų magnetinių laukų poveikį ultraplonųjų La-Sr-MnO3 sluoksnių elektriniam laidumui, buvo nustatyta, kad magnetovaržos anizotropijos ženklas ir vertė šiuo-se laukuose priklauso nuo sluoksnio storio. Pateiktas modelis, paaiškinantis eks-perimentinius rezultatus, paremtas vidutinio lauko artiniu ir įskaitantis sluoksnio struktūros kitimą kintant jo storiui. Aptiktas ir ištirtas grįžtamasis termoelektrinis nestabilumas, išaiškintos šio reiškinio atsiradimo priežastys. Pasiūlytas ir ekspe-rimentiškai realizuotas naujas ns trukmės elektrinių impulsų amplitudės modulia-vimo išoriniu magnetiniu lauku būdas, naudojant epitaksinius La0,87Sr0,17MnO3 sluoksnius. Disertaciją sudaro reziumė lietuvių ir anglų kalbomis, įvadas, šeši skyriai, pagrindiniai rezultatai ir išvados, literatūros sąrašas, publikacijų disertacijos tema sąrašas. Įvadiniame skyriuje nagrinėjamas problemos aktualumas, formuluojamas darbo tikslas bei uždaviniai, aprašomas mokslinis... [toliau žr. visą tekstą]

Advisors/Committee Members: Balevičius, Saulius (Doctoral dissertation supervisor), Jukna, Artūras (Doctoral dissertation committee chair), Česnys, Antanas (Doctoral dissertation advisor), Šatkovskis, Eugenijus (Doctoral dissertation opponent).

Subjects/Keywords: Transport; Charge; Carriers; Krūvininkų; Pernaša; Sluoksniuose

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

APA (6^th Edition):

Tolvaišienė, S. (2009). Transport of charge carriers in ultrathin films of manganese oxides. (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143224-76401 ;

Chicago Manual of Style (16^th Edition):

Tolvaišienė, Sonata. “Transport of charge carriers in ultrathin films of manganese oxides.” 2009. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed February 27, 2021. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143224-76401 ;.

MLA Handbook (7^th Edition):

Tolvaišienė, Sonata. “Transport of charge carriers in ultrathin films of manganese oxides.” 2009. Web. 27 Feb 2021.

Vancouver:

Tolvaišienė S. Transport of charge carriers in ultrathin films of manganese oxides. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2009. [cited 2021 Feb 27]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143224-76401 ;.

Council of Science Editors:

Tolvaišienė S. Transport of charge carriers in ultrathin films of manganese oxides. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2009. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143224-76401 ;

Vilnius Gediminas Technical University

10. Tolvaišienė, Sonata. Krūvininkų pernaša ultraplonuosiuose mangano oksidų sluoksniuose.

Degree: Dissertation, Physics, 2009, Vilnius Gediminas Technical University

URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143235-51205 ;

►

Disertacijoje nagrinėjami lantano manganitai, pasižymintys faziniu virsmu iš paramagnetinės į feromagnetinę būseną bei milžiniškos neigiamos magnetovar-žos efektu. Tiriami magnetovaržos ir jos anizotropijos efektai silpnuose (iki… (more)

▼

Disertacijoje nagrinėjami lantano manganitai, pasižymintys faziniu virsmu iš paramagnetinės į feromagnetinę būseną bei milžiniškos neigiamos magnetovar-žos efektu. Tiriami magnetovaržos ir jos anizotropijos efektai silpnuose (iki  0,5 T) magnetiniuose laukuose bei stiprių impulsinių srovių ir magnetinių laukų sukelti efektai plonuose epitaksiniuose manganitų sluoksniuose. Pateikiami pasiūlymai tyrimo rezultatus panaudoti kuriant magnetinio lauko jutiklius, spar-čiųjų elektrinių impulsų formuotuvus bei amplitudės moduliatorius. Tiriant sil-pnų magnetinių laukų poveikį ultraplonųjų La-Sr-MnO3 sluoksnių elektriniam laidumui, buvo nustatyta, kad magnetovaržos anizotropijos ženklas ir vertė šiuo-se laukuose priklauso nuo sluoksnio storio. Pateiktas modelis, paaiškinantis eks-perimentinius rezultatus, paremtas vidutinio lauko artiniu ir įskaitantis sluoksnio struktūros kitimą kintant jo storiui. Aptiktas ir ištirtas grįžtamasis termoelektrinis nestabilumas, išaiškintos šio reiškinio atsiradimo priežastys. Pasiūlytas ir ekspe-rimentiškai realizuotas naujas ns trukmės elektrinių impulsų amplitudės modulia-vimo išoriniu magnetiniu lauku būdas, naudojant epitaksinius La0,87Sr0,17MnO3 sluoksnius. Disertaciją sudaro reziumė lietuvių ir anglų kalbomis, įvadas, šeši skyriai, pagrindiniai rezultatai ir išvados, literatūros sąrašas, publikacijų disertacijos tema sąrašas. Įvadiniame skyriuje nagrinėjamas problemos aktualumas, formuluojamas darbo tikslas bei uždaviniai, aprašomas mokslinis... [toliau žr. visą tekstą]

The objective of this dissertation is to investigate lanthanum manganites, which exhibit colossal negative magnetoresistance and phase transitions from the paramagnetic state to the ferromagnetic state. The magnetoresistance and its ani-zotriopy of thin epitaxial manganite films at low (up to  0.5 T) magnetic fields, as well as effects induced by strong pulsed magnetic and electric fields were in-vestigated. It was demonstrated how it can be used in the development of magne-tic field sensors, short electric pulse forming devices and amplitude modulators. It was found that in the case of ultra-thin La-Sr-MnO3 films, the sign and value of the magnetoresistance anisotropy at low magnetic fields depends on the thickness of the films. An explanation of these results was proposed using the mean field approach and taking into consideration that the structure of the films changes with its thickness. A reversible thermoelectrical switching effect was discovered and investigated. A new method for nanosecond duration electrical pulses amplitude modulation by an external magnetic field using La0.87Sr0.17MnO3 films was suggested and experimentally verified. This dissertation consists of the abstracts in Lithuanian and English, intro-duction, six chapters, the main results and conclusions and list of literature. The introduction contains topicality and problem, the aim of the work, tasks, scientific novelty, practical value, approval of the results, statement to be de-fended and... [to full text]

Advisors/Committee Members: Balevičius, Saulius (Doctoral dissertation supervisor), Česnys, Antanas (Doctoral dissertation advisor), Jukna, Artūras (Doctoral dissertation committee chair), Šatkovskis, Eugenijus (Doctoral dissertation opponent).

Subjects/Keywords: Krūvininkų; Pernaša; Ultraplonuosiuose; Transport; Charge; Carriers

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

APA (6^th Edition):

Tolvaišienė, S. (2009). Krūvininkų pernaša ultraplonuosiuose mangano oksidų sluoksniuose. (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143235-51205 ;

Chicago Manual of Style (16^th Edition):

Tolvaišienė, Sonata. “Krūvininkų pernaša ultraplonuosiuose mangano oksidų sluoksniuose.” 2009. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed February 27, 2021. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143235-51205 ;.

MLA Handbook (7^th Edition):

Tolvaišienė, Sonata. “Krūvininkų pernaša ultraplonuosiuose mangano oksidų sluoksniuose.” 2009. Web. 27 Feb 2021.

Vancouver:

Tolvaišienė S. Krūvininkų pernaša ultraplonuosiuose mangano oksidų sluoksniuose. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2009. [cited 2021 Feb 27]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143235-51205 ;.

Council of Science Editors:

Tolvaišienė S. Krūvininkų pernaša ultraplonuosiuose mangano oksidų sluoksniuose. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2009. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090218_143235-51205 ;

Kansas State University

11. Ghimire, Govinda. Charge transport and molecular diffusion within self-assembled nanostructures.

Degree: PhD, Department of Chemistry, 2019, Kansas State University

URL: http://hdl.handle.net/2097/40046

► This dissertation describes charge transport behavior within redox-active block copolymer (BCP) microdomains and the diffusion behavior of charged dye molecules within self-assembled bolaamphiphilic organic nanotubes… (more)

▼ This dissertation describes charge transport behavior within redox-active block copolymer (BCP) microdomains and the diffusion behavior of charged dye molecules within self-assembled bolaamphiphilic organic nanotubes (ONTs) of different surface charge and inner diameters. In-depth understanding of the charge transport efficiency within redox-active microdomains in electrode-supported BCP thin films is crucial for their various electrochemical applications. Similarly, understanding of the diffusion behavior of differently charged dye molecules in ONTs will help design nanotubular materials better suited for drug-delivery and adsorbent applications. In the former study, polystyrene-block-poly(2-(acryloyloxy) ethylferrocenecarboxylate) (PS-b-PAEFc) of different PAEFc volume fractions (fPAEFc) was used as redox-active BCPs. The AFM images of PA-b-PAEFc thin films suggested that the morphology of PAEFc microdomains was dependent of the volume fraction. A series of electrochemical data revealed that thin films based on large fPAEFc, which were expected to yield lamellar and cylindrical microdomains, afforded redox-active microdomains that extended from the underlying electrode to the film–solution interface. In addition, charge transport efficiency, which was represented by apparent diffusion coefficient, within the ferrocene-containing microdomains was similar irrespective of fPAEFc, reflecting the similar concentration and dynamic properties of the redox-active moieties. Furthermore, the charge transport was observed in an acetonitrile solution but not in an ethanol solution, indicating that the thin films needed be swollen for redox-mediated charge propagation across the ferrocene moieties in the microdomains. Interestingly, the thin films rendered redox-active in the ethanol solution upon applying an oxidative potential in the acetonitrile solution, possibly due to the migration of electrolyte ions into the films, albeit with lower charge transport efficiency. The “activated” gold-supported PA-b-PAEFc thin films were applicable as electrochemically responsive heterogenous catalysts for Michael addition reaction between a β-dicarbonyl compound and an enone in an ethanol solution. Importantly, the efficiency of the catalytic reaction could be regulated by the potential application, and its selectivity reflected the permeability of the reactants through the thin films. In the latter study, the diffusion behavior of differently charged fluorescent molecules within individual ONTs was systematically measured using imaging fluorescence correlation spectroscopy (imaging FCS) at different pH and ionic strength conditions. The ONTs with the inner diameters of 10 or 20 nm, which were self-assembled from asymmetrical bolaamphiphiles, had glucose moieties on their outer surfaces, and amine or carboxyl groups on their inner surfaces. Imaging FCS could be used to measure the diffusion of dye molecules that interacted with nanotube inner surfaces. Indeed, diffusion coefficients of dye molecules within the ONTs were much smaller… Advisors/Committee Members: Takashi Ito.

Subjects/Keywords: Charge transport; Nanostructures; Redox; Molecular diffusion

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

APA (6^th Edition):

Ghimire, G. (2019). Charge transport and molecular diffusion within self-assembled nanostructures. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/40046

Chicago Manual of Style (16^th Edition):

Ghimire, Govinda. “Charge transport and molecular diffusion within self-assembled nanostructures.” 2019. Doctoral Dissertation, Kansas State University. Accessed February 27, 2021. http://hdl.handle.net/2097/40046.

MLA Handbook (7^th Edition):

Ghimire, Govinda. “Charge transport and molecular diffusion within self-assembled nanostructures.” 2019. Web. 27 Feb 2021.

Vancouver:

Ghimire G. Charge transport and molecular diffusion within self-assembled nanostructures. [Internet] [Doctoral dissertation]. Kansas State University; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2097/40046.

Council of Science Editors:

Ghimire G. Charge transport and molecular diffusion within self-assembled nanostructures. [Doctoral Dissertation]. Kansas State University; 2019. Available from: http://hdl.handle.net/2097/40046

University of Bath

12. Smith, Alexander. Structures, vibrational modes and charge transport of organic semiconductors.

Degree: PhD, 2020, University of Bath

URL: https://researchportal.bath.ac.uk/en/studentthesis/structures-vibrational-modes-and-charge-transport-of-organic-semiconductors(ffdf03b3-46a5-489f-a6bf-52dac5a332ee).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.809737

► Organic semiconductors are quietly revolutionising the modern world, finding application in light-emitting diodes, thin-film transistors and photovoltaics. However their short device lifetimes and reduced power-conversion… (more)

▼ Organic semiconductors are quietly revolutionising the modern world, finding application in light-emitting diodes, thin-film transistors and photovoltaics. However their short device lifetimes and reduced power-conversion efficiencies have limited their commercial uptake. Both experimental and computational work to find new materials and architectures and study of their charge transport properties continues. Computational studies of the charge transport properties of organic semiconductors depend heavily on the structure/morphology. Structures are often assumed to be a regular lattice, even in the case of amorphous materials, with some groups using molecular dynamics (MD) and Monte Carlo (MC) methods to capture the disorder. However these approaches have significant drawbacks, some of which are technical (MD and MC can be computationally arduous at large system size) and some of which are physical (below the glass transition, the energy landscape makes it difficult to sample a large number of states). Other approaches such as coarse-grained and basin-hopping methods attempt to overcome these problems but often create new problems such as the need to develop new force-fields, having to regain full-atomistic representation of molecules afterwards, and still being hindered by the landscape. In this work, a new method, Simulation of Atomistic Molecular Structures using an Elastic Network (SAMSEN), is proposed and applied to molecular and polymeric systems. SAMSEN contains both a structural and dynamical model that individually attempt to overcome the technical and physical problems of current methods. The structural model requires that molecules are split into rigid sections, which retain their atomistic representation and are constructed to interlock with their neighbouring sections, and restrict the maximum displacement of atoms from their locally optimised positions. Atomic collision rules, limiting minimum separations, are also enforced. This combination allows SAMSEN to recreate the short-range structure of weakly-interacting non-polar small molecules. The dynamical model creates an elastic network between the rigid sections and displaces them across the low-frequency vibrational modes to achieve collective large-scale motion and computationally-fast structural relaxation. SAMSEN is applied to systems of spheres to study the structural and dynamical parameters and a regime is found where a band of collective low-frequency modes can be found, sampling rate can be increased without altering structure and the mean overlap of atoms can be controlled without altering the sampling rate. The structural parameters are determined entirely by the class of system being studied, leaving the dynamical parameters to be chosen to maximise sampling rate. SAMSEN is then applied to systems of small molecules and is shown to be widely applicable, providing good approximations to the short range structures produced by full atomistic force-field methods. SAMSEN phenyl-C61-butyric acid methyl ester (PCBM) states are found to have…

Subjects/Keywords: organic semiconductor; charge transport; simulation; model; PCBM

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APA (6^th Edition):

Smith, A. (2020). Structures, vibrational modes and charge transport of organic semiconductors. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/structures-vibrational-modes-and-charge-transport-of-organic-semiconductors(ffdf03b3-46a5-489f-a6bf-52dac5a332ee).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.809737

Chicago Manual of Style (16^th Edition):

Smith, Alexander. “Structures, vibrational modes and charge transport of organic semiconductors.” 2020. Doctoral Dissertation, University of Bath. Accessed February 27, 2021. https://researchportal.bath.ac.uk/en/studentthesis/structures-vibrational-modes-and-charge-transport-of-organic-semiconductors(ffdf03b3-46a5-489f-a6bf-52dac5a332ee).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.809737.

MLA Handbook (7^th Edition):

Smith, Alexander. “Structures, vibrational modes and charge transport of organic semiconductors.” 2020. Web. 27 Feb 2021.

Vancouver:

Smith A. Structures, vibrational modes and charge transport of organic semiconductors. [Internet] [Doctoral dissertation]. University of Bath; 2020. [cited 2021 Feb 27]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/structures-vibrational-modes-and-charge-transport-of-organic-semiconductors(ffdf03b3-46a5-489f-a6bf-52dac5a332ee).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.809737.

Council of Science Editors:

Smith A. Structures, vibrational modes and charge transport of organic semiconductors. [Doctoral Dissertation]. University of Bath; 2020. Available from: https://researchportal.bath.ac.uk/en/studentthesis/structures-vibrational-modes-and-charge-transport-of-organic-semiconductors(ffdf03b3-46a5-489f-a6bf-52dac5a332ee).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.809737

Georgia Tech

13. Pittelli, Sandra. Understanding the Effects of Structure on the Charge Transport Properties and Doping of Dioxythiophene Polymers.

Degree: PhD, Chemistry and Biochemistry, 2019, Georgia Tech

URL: http://hdl.handle.net/1853/64050

► Redox-active conjugated polymers have been investigated for a multitude of applications including electrochromic displays, transistors, and transparent conducting electrodes. As with all fields of polymer… (more)

▼ Redox-active conjugated polymers have been investigated for a multitude of applications including electrochromic displays, transistors, and transparent conducting electrodes. As with all fields of polymer science, the material properties observed for these conjugated polymers are determined by their structure. While the groundwork for probing their fundamental structure-property relationships has been established, there is still much to be explored in order to have a holistic understanding of these systems. This dissertation aims to investigate how the structure of dioxythiophene polymers can affect the processes of chemical and electrochemical oxidation, their charge transport properties, and their use in electrochemical and solid-state applications. Chapter 1 provides an introduction to the fundamental properties and concepts of conjugated polymers, and their use in potential applications. Characterization methods used in this work, including electrochemical experimentation and dry-film characterizations are highlighted in Chapter 2. Chapter 3 describes the work exploring how the use of chemical oxidants and phosphonic acids can be used as pre-treatment steps in the construction of electrochemical devices. A family of polymers including two dixoythiophenes (DOTs) and one dioxypyrrole (DOP) were exposed to a series of chemical oxidant salts with the oxidizing agent either being Ag+ or Fe3+. The structure and redox properties of the conjugated polymers were shown to affect the overall extent of oxidation. Specifically, the DOT polymer that had the highest onset of oxidation in the family was oxidized to a lesser extent when using Ag+ as the chemical oxidant rather than Fe3+. In contrast, the DOT polymer with the lowest onset of oxidation in the family was oxidized to the same extent using both dopants. Using Fe3+ was shown to disrupt the interface between films of each polymer in the family and the conducting substrate, however this was rectified through modification of the surface energy of the substrate using phosphonic acids. Ultimately, it was shown that devices constructed after chemical pre-oxidation had comparable electrochromic contrasts to those using an electrochemical pre-oxidation step. Chapter 4 explores the effects of side chain alteration on the charge transport properties of a family of either 3,4-propylenedioxythiophene (ProDOT) or acyclic dioxythiophene (AcDOT) homopolymers. It was shown that the incorporation of linear side chains rather than branched side chains for both the ProDOT and AcDOT polymers allowed for a decrease in the onset of electrochemical oxidation by 300 mV and a 2 order of magnitude increase in the solid-state in-plane conductivity (10-3 vs 10-1 S/cm) after chemical oxidation. This study ultimately showed that there is a delicate balance in the degree of ordering of the polymer film and effective charge transport. Chapter 5 further supported this concept of balance by probing a family of soluble dioxythienothiophene (DOTT) polymers for their structure-property relationships.… Advisors/Committee Members: Reynolds, John (advisor), Bottomley, Lawrence (advisor), Collard, David (advisor), Silva, Carlos (advisor), Lin, Zhiqun (advisor).

Subjects/Keywords: Conjugated polymers; Doping; Charge transport; Conductivity

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

APA (6^th Edition):

Pittelli, S. (2019). Understanding the Effects of Structure on the Charge Transport Properties and Doping of Dioxythiophene Polymers. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/64050

Chicago Manual of Style (16^th Edition):

Pittelli, Sandra. “Understanding the Effects of Structure on the Charge Transport Properties and Doping of Dioxythiophene Polymers.” 2019. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021. http://hdl.handle.net/1853/64050.

MLA Handbook (7^th Edition):

Pittelli, Sandra. “Understanding the Effects of Structure on the Charge Transport Properties and Doping of Dioxythiophene Polymers.” 2019. Web. 27 Feb 2021.

Vancouver:

Pittelli S. Understanding the Effects of Structure on the Charge Transport Properties and Doping of Dioxythiophene Polymers. [Internet] [Doctoral dissertation]. Georgia Tech; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1853/64050.

Council of Science Editors:

Pittelli S. Understanding the Effects of Structure on the Charge Transport Properties and Doping of Dioxythiophene Polymers. [Doctoral Dissertation]. Georgia Tech; 2019. Available from: http://hdl.handle.net/1853/64050

RMIT University

14. Walker, K. Charge correlation and transport properties in one-dimensional arrays of tunnel junctions.

Degree: 2015, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:161561

► In this thesis we present a mathematical model and numerical simulations of one-dimensional arrays of small tunnel junctions to investigate correlated charge transport and other… (more)

▼ In this thesis we present a mathematical model and numerical simulations of one-dimensional arrays of small tunnel junctions to investigate correlated charge transport and other transport properties. Our primary motivation for this research is the recent discrepancies between theoretical models and experimental observations in the literature. Several experimentally observed behaviours can not be explained or predicted by the orthodox theory of junction array physics, which has successfully and fully predicted and described charge transport in single tunnel junctions since the 1980s. These findings highlight the need for a complete theoretical framework for multi-junction systems. We consider linear and bilinear junction arrays in both the normal and superconducting transport regimes. We primarily focus on the correlated charge transport regime, which we find is optimal in the low current (voltage) limit. We initially simulate clean arrays and then investigate the effect of both the weak and maximal background charge disorder limits on correlated transport and the current-voltage characteristics. Disorder, most important at small bias voltages, impedes charge correlations and shifts threshold voltages. At high voltages we find very little difference across the disorder strengths. An intriguing behaviour of tunnel junction devices manifests when we apply a small offset voltage across the arrays. This voltage offset enforces different charge patterns within the array and as a result the current exhibits significant periodic modulation as a function of the offset. Through quantitative analysis, the specific charge patterns can be identified. Notwithstanding that the integrity of these patterns is largely compromised in the presence of disorder, the current continues to exhibit substantial periodic offset voltage dependence. In the superconducting regime we discuss the interplay between the different charge carriers and differences in the conduction and transport properties between the normal and superconducting limits. We simulate unexplained experimental observations by including charge disorder and sub-gap leakage into our model. This work contributes to the knowledge of these devices and the development of a microscopic junction array model which correctly and completely explains all experimental effects. Furthermore, this thesis demonstrates the rich physics contained within these relatively simple circuits and through several of the behaviours reported above, the possibility for even more new effects to be discovered.

Subjects/Keywords: Fields of Research; Electron transport; Superconductivity; Correlated charge transport; Single charge devices; Josephson effect

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

APA (6^th Edition):

Walker, K. (2015). Charge correlation and transport properties in one-dimensional arrays of tunnel junctions. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:161561

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):

Walker, K. “Charge correlation and transport properties in one-dimensional arrays of tunnel junctions.” 2015. Thesis, RMIT University. Accessed February 27, 2021. http://researchbank.rmit.edu.au/view/rmit:161561.

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

MLA Handbook (7^th Edition):

Walker, K. “Charge correlation and transport properties in one-dimensional arrays of tunnel junctions.” 2015. Web. 27 Feb 2021.

Vancouver:

Walker K. Charge correlation and transport properties in one-dimensional arrays of tunnel junctions. [Internet] [Thesis]. RMIT University; 2015. [cited 2021 Feb 27]. Available from: http://researchbank.rmit.edu.au/view/rmit:161561.

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

Council of Science Editors:

Walker K. Charge correlation and transport properties in one-dimensional arrays of tunnel junctions. [Thesis]. RMIT University; 2015. Available from: http://researchbank.rmit.edu.au/view/rmit:161561

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

15. Bercegol, Adrien. Transport de charge dans le photovoltaïque par imagerie multidimensionnelle de luminescence : Charge transport in photovoltaics via multidimensional luminescence imaging.

Degree: Docteur es, Physico-chimie, 2019, Paris Sciences et Lettres (ComUE)

URL: http://www.theses.fr/2019PSLEC021

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L’IRDEP (UMR EDF-CNRS-ChimieParisTech) est spécialisé dans la conception et l’élaboration de cellules solaires en couches minces. Nous développerons dans cette thèse de nouvelles méthodes de… (more)

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L’IRDEP (UMR EDF-CNRS-ChimieParisTech) est spécialisé dans la conception et l’élaboration de cellules solaires en couches minces. Nous développerons dans cette thèse de nouvelles méthodes de caractérisation permettant une cartographie (imagerie) des propriétés de transport des cellules à différentes échelles sur plusieurs technologies photovoltaïques. Des expériences basées sur la photoluminescence (PL) et les différentes techniques associées en régime transitoire (résolution temporelle, modulation optique, modulation électrique) seront utilisées. Le travail se base sur la suite d’une thèse CIFRE (Gilbert El-Hajje) où l’analyse des déclins temporels de PL sur CIGS a été faite. La PL pourra être corrélée à l’analyse d’autres signaux complémentaires tels que l’Electroluminescence (EL) voire à la Cathodoluminescence (CL). Ajoutons que la PL est une méthode de caractérisation purement optique, sans contacts électriques, qui permet un contrôle qualité à différentes étapes de fabrication et présente alors un fort intérêt dans le milieu industriel. En effet, cette technique de mesure se développe dans plusieurs industries pour le control in-line des dispositifs: l'intensité de PL est liée à la tension de circuit ouvert et le temps de déclin de la PL est lié au rendement des cellules.

IRDEP specialises in the development of thin film solar cells. New characterization methods will be developped during this thesis, allowing to map transport properties at numerous scales inside various types of solar cells. We plan to realise experiments based on photoluminescence (PL) and different associated techniques (spatial resolution, optical modulation, electrical modulation). This work is based on a previous thesis (by Gilbert El-Hajje), in which PL decay in CIGS solar cells has been analyzed. PL correlation with other signals such as electroluminescnce and cathodoluminescence will be investigated. What's more, PL is an essentially optical characterization method, thus contactless, which allows an effective quality at every step of the production process. That's why many industries have shown interest for this technique, by developping in-line control. The PL intensity is related to the open-cuircuit voltage, as well as the signal decay time to the cell efficiency.

Advisors/Committee Members: Lombez, Laurent (thesis director).

Subjects/Keywords: Transport de charge; Caractérisation optique; Photoluminescence; Perovskite; Photovoltaïque; Charge transport; Optical characterization; Photoluminescence; Perovskite; Photovoltaics

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

APA (6^th Edition):

Bercegol, A. (2019). Transport de charge dans le photovoltaïque par imagerie multidimensionnelle de luminescence : Charge transport in photovoltaics via multidimensional luminescence imaging. (Doctoral Dissertation). Paris Sciences et Lettres (ComUE). Retrieved from http://www.theses.fr/2019PSLEC021

Chicago Manual of Style (16^th Edition):

Bercegol, Adrien. “Transport de charge dans le photovoltaïque par imagerie multidimensionnelle de luminescence : Charge transport in photovoltaics via multidimensional luminescence imaging.” 2019. Doctoral Dissertation, Paris Sciences et Lettres (ComUE). Accessed February 27, 2021. http://www.theses.fr/2019PSLEC021.

MLA Handbook (7^th Edition):

Bercegol, Adrien. “Transport de charge dans le photovoltaïque par imagerie multidimensionnelle de luminescence : Charge transport in photovoltaics via multidimensional luminescence imaging.” 2019. Web. 27 Feb 2021.

Vancouver:

Bercegol A. Transport de charge dans le photovoltaïque par imagerie multidimensionnelle de luminescence : Charge transport in photovoltaics via multidimensional luminescence imaging. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres (ComUE); 2019. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2019PSLEC021.

Council of Science Editors:

Bercegol A. Transport de charge dans le photovoltaïque par imagerie multidimensionnelle de luminescence : Charge transport in photovoltaics via multidimensional luminescence imaging. [Doctoral Dissertation]. Paris Sciences et Lettres (ComUE); 2019. Available from: http://www.theses.fr/2019PSLEC021

16. Bobbara, Sanyasi. Effect of Encapsulation and Light-soak on Charge Transport Properties in Organic Semiconductor –based Diodes : Effet d'encapsulation et d'éclairement prolongé sur les propriétés de transport de charges dans les diodes semiconductrices organiques.

Degree: Docteur es, Physique, milieux dilués et optique fondamentale, 2017, Angers; Queen's University (Canada)

URL: http://www.theses.fr/2017ANGE0022

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Les semiconducteurs organiques (SO) ont attiré une grande attention ces dernières années en raison de leur facilité de fabrication, de leurs modifications des propriétés optiques… (more)

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Les semiconducteurs organiques (SO) ont attiré une grande attention ces dernières années en raison de leur facilité de fabrication, de leurs modifications des propriétés optiques et électriques et de leur rentabilité. Ils forment la classe de matériaux les plus adaptés à l'électronique flexible et à la bioélectronique, en particulier en association avec des matériaux inorganiques / hybrides solubles en solution. Cependant, la mobilité des charges dans ces matériaux est fortement affectés par leur désordre structurel et énergétique introduit par les défauts qui "piègent" les transporteurs de charge. Selon l'emplacement physique des pièges et leur distribution en énergie, ils pourraient affecter de manière significative le transport de charge dans un dispositif. Le présent travail s'efforce de sonder l'interface et les états défectueux en masse dans des diodes à base de polymère. Au lieu de cela, une partie de l'étude implique de caractériser le système avec et sans encapsulation, en utilisant des techniques pour enregistrer le comportement de courant-tension à l'état stationnaire (IV), les transitoires d'extraction de charge par la tension augmentant linéairement (CELIV) et les courants transitoires d'injection en obscurité (DiTC), ainsi que la photoluminescence (PL) et l'électroluminescence (EL) des systèmes. Les mêmes caractéristiques ont été effectuées pour observer l'effet de pénétration de la lumière ultraviolet (UV) sur les systèmes. Tous les tests ont été effectués sur trois polymères différents, à savoir P3HT, MDMO:PPV et PCDTBT. La comparaison des dispositifs encapsulés et non encapsulés donne un aperçu des différences caractéristiques des mesurables lors de l'exposition à l'air et humidité. Les tests de pénétration lumineuse indiquent la modification de la fonction de travail de la cathode après une désorption d'oxygène assistée par UV sur l'interface polymère/cathode. Un effort simultané s'est traduit par une étude in situ de la dynamique de transport des charges dans les semi-conducteurs organiques sur une large gamme de temps à une échelle microscopique.

Organic semiconductors (OSs) have garnered a great attention in the recent years due to their ease of processibility, optical and electrical property-tunability, and to their cost-effectiveness. They form the class of materials most suitable for flexible electronics and bioelectronics, especially in association with solutionprocessable inorganic/hybrid materials. However, the charge mobility in these materials is strongly affected by their structural and energetic disorder introduced by the defects that ‘trap’ the charge carriers. Depending upon the physical location of the traps and their distribution in energy, they could significantly affect the charge transport in a device. The present work strives to probe the interface and bulk defect states in polymer-based diodes. In lieu of that, a part of the study involved characterizing the device with and without encapsulation, using techniques to record steady-state current-voltage (IV)behaviour,…

Advisors/Committee Members: Nunzi, Jean-Michel (thesis director), Barille, Regis (thesis director).

Subjects/Keywords: Transport de charges; Encapsulation; Organic solar cell; Charge transport; Encapsulation; 530

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

APA (6^th Edition):

Bobbara, S. (2017). Effect of Encapsulation and Light-soak on Charge Transport Properties in Organic Semiconductor –based Diodes : Effet d'encapsulation et d'éclairement prolongé sur les propriétés de transport de charges dans les diodes semiconductrices organiques. (Doctoral Dissertation). Angers; Queen's University (Canada). Retrieved from http://www.theses.fr/2017ANGE0022

Chicago Manual of Style (16^th Edition):

Bobbara, Sanyasi. “Effect of Encapsulation and Light-soak on Charge Transport Properties in Organic Semiconductor –based Diodes : Effet d'encapsulation et d'éclairement prolongé sur les propriétés de transport de charges dans les diodes semiconductrices organiques.” 2017. Doctoral Dissertation, Angers; Queen's University (Canada). Accessed February 27, 2021. http://www.theses.fr/2017ANGE0022.

MLA Handbook (7^th Edition):

Bobbara, Sanyasi. “Effect of Encapsulation and Light-soak on Charge Transport Properties in Organic Semiconductor –based Diodes : Effet d'encapsulation et d'éclairement prolongé sur les propriétés de transport de charges dans les diodes semiconductrices organiques.” 2017. Web. 27 Feb 2021.

Vancouver:

Bobbara S. Effect of Encapsulation and Light-soak on Charge Transport Properties in Organic Semiconductor –based Diodes : Effet d'encapsulation et d'éclairement prolongé sur les propriétés de transport de charges dans les diodes semiconductrices organiques. [Internet] [Doctoral dissertation]. Angers; Queen's University (Canada); 2017. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2017ANGE0022.

Council of Science Editors:

Bobbara S. Effect of Encapsulation and Light-soak on Charge Transport Properties in Organic Semiconductor –based Diodes : Effet d'encapsulation et d'éclairement prolongé sur les propriétés de transport de charges dans les diodes semiconductrices organiques. [Doctoral Dissertation]. Angers; Queen's University (Canada); 2017. Available from: http://www.theses.fr/2017ANGE0022

Oklahoma State University

17. Norouzzadeh, Payam. Charge Carrier and Phonon Transport in Nanostructured Thermoelectrics.

Degree: School of Materials Science & Engineering, 2012, Oklahoma State University

URL: http://hdl.handle.net/11244/7888

► There is currently no quantum mechanical transport model for charge (or phonon) transport in multiphase nano-crystalline structures. Due to absence of periodicity, one cannot apply… (more)

▼ There is currently no quantum mechanical transport model for charge (or phonon) transport in multiphase nano-crystalline structures. Due to absence of periodicity, one cannot apply any of the elegant theorems, such as Bloch's theorem, which are implicit in the basic theory of crystalline solids. Atomistic models such as Kubo and NEGF may assume an accurate knowledge of the interatomic potentials; however, calculations for real 3D random multi-phase systems require so large computational times that makes them practically impossible.In a multi-phase nano-crystalline material, grains and interfacial microstructures may have three distinct types as depicted in figure. In such a material, the physical processes in each individual grain no longer follow the well described classical continuum linear transport theory. Therefore, a proper model for coupled transport of charge carriers and phonons that takes into account the effect of their non-equilibrium energy distribution is highly desirable.Two new theories and associated codes based on Coherent Potential Approximation (CPA) one for electron transport and one for phonon transport are developed. The codes calculate the charge and phonon transport parameters in nanocomposite structures. These can be nano-crystalline (symmetric case) or the material with embedded nano-particles (dispersion case). CPA specifically considers multi-scattering effect that cannot be explained with other semi-classical methods such as Partial Wave or Fermi's golden rule. To our knowledge this is the first CPA code developed to study both charge and phonon transport in nanocomposite structures.The codes can be extend to different types of nano-crystalline materials taking into account the average grain size, as well as the grain size distribution, and volume fraction of the different constituents in the materials. This is a strong tool that can describe more complex systems such as nano-crystals with randomly oriented grains with predictive power for the properties of electrical and thermal properties of disordered nano-crystalline electronic materials. Advisors/Committee Members: Vashaee, Daryoosh (advisor), Krasinski, Jerzy S. (committee member), Acken, John Michael (committee member), Ede, Kenneth F. (committee member).

Subjects/Keywords: charge transport; coherent potential approximation; nanostructuring; phonon transport; thermoelectrics

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

APA (6^th Edition):

Norouzzadeh, P. (2012). Charge Carrier and Phonon Transport in Nanostructured Thermoelectrics. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/7888

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):

Norouzzadeh, Payam. “Charge Carrier and Phonon Transport in Nanostructured Thermoelectrics.” 2012. Thesis, Oklahoma State University. Accessed February 27, 2021. http://hdl.handle.net/11244/7888.

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

MLA Handbook (7^th Edition):

Norouzzadeh, Payam. “Charge Carrier and Phonon Transport in Nanostructured Thermoelectrics.” 2012. Web. 27 Feb 2021.

Vancouver:

Norouzzadeh P. Charge Carrier and Phonon Transport in Nanostructured Thermoelectrics. [Internet] [Thesis]. Oklahoma State University; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/7888.

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

Council of Science Editors:

Norouzzadeh P. Charge Carrier and Phonon Transport in Nanostructured Thermoelectrics. [Thesis]. Oklahoma State University; 2012. Available from: http://hdl.handle.net/11244/7888

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

University of Cambridge

18. Tainter, Gregory Demaray. Spatially resolved charge transport and recombination in metal-halide perovskite films and solar cells.

Degree: PhD, 2018, University of Cambridge

URL: https://doi.org/10.17863/CAM.33347 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763721

► Metal-halide perovskites show great promise as solution-processable semiconductors for efficient solar cells and LEDs. In particular, the diffusion range of photogenerated carriers is unexpectedly long… (more)

▼ Metal-halide perovskites show great promise as solution-processable semiconductors for efficient solar cells and LEDs. In particular, the diffusion range of photogenerated carriers is unexpectedly long and the luminescence yield is remarkably high. While much effort has been made to improve device performance, the barriers to improving charge transport and recombination properties remain unidentified. I first explore charge transport by investigating a back-contact architecture for measurement. In collaboration with the Snaith group at Oxford, we develop a new architecture to isolate charge carriers. We prepare thin films of perovskite semiconductors over laterally-separated electron- and hole-selective materials of SnOₓ and NiOₓ, respectively. Upon illumination, electrons (holes) generated over SnOₓ (NiOₓ) rapidly transfer to the buried collection electrode, leaving holes (electrons) to diffuse laterally as majority carriers in the perovskite layer. We characterise charge transport parameters of electrons and holes, separately, and demonstrate that grain boundaries do not prevent charge transport. Our results show that the low mobilities found in applied-field techniques do not reflect charge diffusivity in perovskite solar cells at operating conditions. We then use the back-contact architecture to investigate recombination under large excess of one charge carrier type. Recombination velocities under these conditions are found to be below 2 cm s⁻¹, approaching values of high quality silicon and an order of magnitude lower than under common bipolar conditions. Similarly, diffusion lengths of electrons and holes exceed 12 μm, an order of magnitude higher than reported in perovskite devices to date. We report back-contact solar cells with short-circuit currents as high as 18.4 mA cm⁻², giving 70% external charge-collection efficiency. We then explore the behaviour of charge carriers in continuously illuminated metal-halide perovskite devices. We show that continuous illumination of perovskite devices gives rise to a segregated charge carrier population, and we find that the distance photo-induced charges travel increases significantly under these conditions. Finally, we examine intermittancy in the photoluminescence intensity of metal-halide perovskite films.

Subjects/Keywords: 621.31; Perovskite solar cells; photoluminescence spectroscopy; photocurrent spectroscopy; hybrid perovskites; charge transport; charge recombination

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

APA (6^th Edition):

Tainter, G. D. (2018). Spatially resolved charge transport and recombination in metal-halide perovskite films and solar cells. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.33347 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763721

Chicago Manual of Style (16^th Edition):

Tainter, Gregory Demaray. “Spatially resolved charge transport and recombination in metal-halide perovskite films and solar cells.” 2018. Doctoral Dissertation, University of Cambridge. Accessed February 27, 2021. https://doi.org/10.17863/CAM.33347 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763721.

MLA Handbook (7^th Edition):

Tainter, Gregory Demaray. “Spatially resolved charge transport and recombination in metal-halide perovskite films and solar cells.” 2018. Web. 27 Feb 2021.

Vancouver:

Tainter GD. Spatially resolved charge transport and recombination in metal-halide perovskite films and solar cells. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Feb 27]. Available from: https://doi.org/10.17863/CAM.33347 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763721.

Council of Science Editors:

Tainter GD. Spatially resolved charge transport and recombination in metal-halide perovskite films and solar cells. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.33347 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763721

19. Paradisi, Andrea. Ultra-high carrier modulation in two dimensions through space charge doping : graphene and zinc oxide : Modulation ultra-haute de charge en deux dimensions à travers le dopage par charge d'espace : graphène et oxide de zinc.

Degree: Docteur es, Physique, 2016, Université Pierre et Marie Curie – Paris VI

URL: http://www.theses.fr/2016PA066297

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La modulation de la densité de charge est un aspect important de l'étude de les transitions de phase électroniques ainsi que des propriétés électroniques des… (more)

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La modulation de la densité de charge est un aspect important de l'étude de les transitions de phase électroniques ainsi que des propriétés électroniques des matériaux et il est à la base de plusieurs applications dans la micro-électronique. L'ajustement de la densité des porteurs de charge (dopage) peut être fait par voie chimique, en ajoutant des atomes étrangers au réseau cristallin du matériau ou électrostatiquement, en créant un accumulation de charge comme dans un Transistor é Effet de Champ. Cette dernier m ethode est réversible et particuliérement appropriée pour les matériaux bidimensionnels (2D) ou pour des couches ultra-minces. Le Dopage par Charge d'Espace est une nouvelle technique inventée et développée au cours de ce travail de thèse pour le dopage electrostatique de matériaux déposés sur la surface du verre. Une charge d'espace est créée à la surface en provoquant le mouvement des ions sodium présents dans le verre sous l'effet de la chaleur et d'un champ électrique extérieur. Cette espace de charge induit une accumulation de charge dans le matériau déposé sur la surface du verre, ce qui peut être supérieure à 10¹⁴/cm². Une caractérisation détaillée faite avec mesures de transport, effet Hall, mesures Raman et mesures de Microscopie a Force Atomique (AFM) montrent que le dopage est réversible, bipolaire et il ne provoque pas des modifications chimiques. Cette technique peut être appliquée a des grandes surfaces, comme il est montré pour le cas du graph ene CVD. Dans une deuxiéme partie le dopage par espace de charge est appliqué à des couches ultra-minces (< 40 nm) de ZnO_(1-x). Le résultat est un abaissement de la résistance par carré de 5 ordres de grandeur. Les mesures de magnéto-transport faites à basse température montrent que les électrons dop es sont confinés en deux dimensions. Une transition remarquable de la localisation faible à l'anti-localisation est observée en fonction du dopage et de la température et des conclusions sont tirées à propos des phénoménes de diffusion qui gouverne le transport électronique dans des diff erentes conditions dans ce matériau.

Carrier modulation is an important parameter in the study of the electronic phase transitions and the electronic properties of materials and at the basis for many applications in microelectronics. The tuning of charge carrier density (doping) can be achieved chemically, by adding foreign atoms to the crystal structure of the material or electrostatically, by inducing a charge accumulation like in a Field Eect Transistor device. The latter method is reversible and particularly indicated for use in two dimensional (2D) materials or ultra-thin films. Space Charge Doping is a new technique invented and developed during this thesis for the electrostatic doping of such materials deposited on a glass surface. A space charge is created at the surface by causing sodium ions contained in glass to drift under the Eect of heat and an external electric field. This space charge in turn induces a charge accumulation in the material deposited on…

Advisors/Committee Members: Shukla, Abhay (thesis director).

Subjects/Keywords: Ultra-Haut dopage; Graphène; Oxide de zinc; Verre; Magnéto-Transport; Charge d'éspace; Glass surface; Space charge; Magneto-transport; 530

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

APA (6^th Edition):

Paradisi, A. (2016). Ultra-high carrier modulation in two dimensions through space charge doping : graphene and zinc oxide : Modulation ultra-haute de charge en deux dimensions à travers le dopage par charge d'espace : graphène et oxide de zinc. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2016PA066297

Chicago Manual of Style (16^th Edition):

Paradisi, Andrea. “Ultra-high carrier modulation in two dimensions through space charge doping : graphene and zinc oxide : Modulation ultra-haute de charge en deux dimensions à travers le dopage par charge d'espace : graphène et oxide de zinc.” 2016. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed February 27, 2021. http://www.theses.fr/2016PA066297.

MLA Handbook (7^th Edition):

Paradisi, Andrea. “Ultra-high carrier modulation in two dimensions through space charge doping : graphene and zinc oxide : Modulation ultra-haute de charge en deux dimensions à travers le dopage par charge d'espace : graphène et oxide de zinc.” 2016. Web. 27 Feb 2021.

Vancouver:

Paradisi A. Ultra-high carrier modulation in two dimensions through space charge doping : graphene and zinc oxide : Modulation ultra-haute de charge en deux dimensions à travers le dopage par charge d'espace : graphène et oxide de zinc. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2016. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2016PA066297.

Council of Science Editors:

Paradisi A. Ultra-high carrier modulation in two dimensions through space charge doping : graphene and zinc oxide : Modulation ultra-haute de charge en deux dimensions à travers le dopage par charge d'espace : graphène et oxide de zinc. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2016. Available from: http://www.theses.fr/2016PA066297

University of Michigan

20. Kim, Gun Ho. Thermoelectric Transport in Organic Materials.

Degree: PhD, Mechanical Engineering, 2013, University of Michigan

URL: http://hdl.handle.net/2027.42/102350

► Organic materials are well-suited to certain applications due to their low cost, low weight, and mechanical flexibility, but are less desirable for other applications due… (more)

▼ Organic materials are well-suited to certain applications due to their low cost, low weight, and mechanical flexibility, but are less desirable for other applications due to poor conduction of electricity and heat. The contributions of my work focus on strategies to mitigate these limitations in current and emerging organic materials, developing techniques to improve charge carrier mobility in doped organic semiconductors (OSCs) and improve thermal conductivity in common commercial plastic materials. Understanding of charge carrier transport is a prerequisite to developing a good electrical conductor. In OSCs, charge carriers are historically assumed to be strongly localized, which bears heavily on their assumed mechanism of transport; however, the degree of localization in emerging high-conductivity OSCs has been the subject of intense study. My work develops a model that can be used with thermoelectric measurements to quantitatively determine the degree of carrier localization in an OSC, and applies this technique to high-conductivity polymers and iodine-doped pentacene films. The model also suggests a strategy to improve energy conversion efficiency in OSC-based thermoelectric materials by reducing dopant volume. This strategy was confirmed experimentally to vary all three thermoelectric parameters (Seebeck coefficient, electrical conductivity, and thermal conductivity) in a manner that increases thermoelectric efficiency, in sharp contrast to their trade-offs in common inorganic semiconductor based thermoelectric materials. This method led to 70% increase in the thermoelectric efficiency from the previous record for an OSC. Finally, I propose and study methods to increase inter-chain bonding in polymer mixtures as an efficient engineering route to improve their thermal conductivity. By controlling the mole fractions of components to favor (strong) hydrogen bonds over weaker van der Waals bonds, the thermal conductivities of mixtures of common commercial polymers are increased by an order of magnitude, reaching 1.72 W/mK, the highest value yet reported among non-crystalline polymer materials without the incorporation of fillers. Advisors/Committee Members: Pipe, Kevin Patrick (committee member), Shtein, Max (committee member), Sangi Reddy, Pramod (committee member), Kurabayashi, Katsuo (committee member), Kim, Jinsang (committee member).

Subjects/Keywords: Organic Materials; Thermoelectric Conversion Efficiency; Charge Carrier Transport; Thermal Transport; Materials Science and Engineering; Engineering

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

APA (6^th Edition):

Kim, G. H. (2013). Thermoelectric Transport in Organic Materials. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/102350

Chicago Manual of Style (16^th Edition):

Kim, Gun Ho. “Thermoelectric Transport in Organic Materials.” 2013. Doctoral Dissertation, University of Michigan. Accessed February 27, 2021. http://hdl.handle.net/2027.42/102350.

MLA Handbook (7^th Edition):

Kim, Gun Ho. “Thermoelectric Transport in Organic Materials.” 2013. Web. 27 Feb 2021.

Vancouver:

Kim GH. Thermoelectric Transport in Organic Materials. [Internet] [Doctoral dissertation]. University of Michigan; 2013. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2027.42/102350.

Council of Science Editors:

Kim GH. Thermoelectric Transport in Organic Materials. [Doctoral Dissertation]. University of Michigan; 2013. Available from: http://hdl.handle.net/2027.42/102350

21. Merienne, Hugo. Biomécanique et énergétique de la locomotion et du transport de charge chez la fourmi : Biomechanics and energetics of locomotion and load transport in ants.

Degree: Docteur es, Ecologie, biodiversité et évolution, 2019, Université Toulouse III – Paul Sabatier

URL: http://www.theses.fr/2019TOU30257

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Lors de cette thèse, nous avons étudié la locomotion chez la fourmi Messor barbarus et la manière dont celle-ci est affectée par la charge transportée.… (more)

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Lors de cette thèse, nous avons étudié la locomotion chez la fourmi Messor barbarus et la manière dont celle-ci est affectée par la charge transportée. Ce travail recouvre trois aspects de la locomotion : la cinématique des pattes, la dynamique du centre de masse de la fourmi et la dépense énergétique associée à la locomotion. Nous avons porté une attention particulière à l'effet de la taille de la fourmi sur la locomotion ainsi qu'à l'effet de la masse relative de la charge transportée. Ce travail a montré que, lors de la locomotion non chargée, les petites et grosses fourmis n'ont pas le même patron locomoteur, les grosses fourmis s'ajustant au déséquilibre induit par leur tête proportionnellement plus grosse. Pour les fourmis chargées, le patron locomoteur varie peu avec la taille de la fourmi et celles-ci doivent régulièrement s'agripper au substrat avec leurs pattes arrières afin de ne pas basculer vers l'avant. Pour les fourmis non chargées, ou chargées avec de petites charges, la trajectoire du centre de masse lors de la locomotion correspond aux démarches observées chez d'autres insectes. Cependant, une charge de masse relative trop importante rend la locomotion erratique. Enfin, nous avons mesuré le taux métabolique pour différentes fourmis non chargées et chargées avec des charges de masses variables. Les variations du taux métabolique sont cohérentes avec les résultats de la littérature sur d'autres espèces de fourmis. Grâce à ces expériences, nous avons pu calculer le taux auquel les fourmis ramènent de l'énergie à la colonie en fonction de leur masse et de la masse de la graine transportée. Afin de maximiser ce taux, les petites fourmis ont intérêt à récolter de petites graines, alors que les plus grosses fourmis devraient transporter des graines plus lourdes. Les résultats obtenus durant cette thèse permettront de contribuer à une meilleure compréhension de la division du travail, de l'écologie et du comportement d'approvisionnement chez l'espèce Messor barbarus.

Load transport is rarely observed in animals. In this respect, ants probably display the most outstanding performances: they are indeed able to carry loads weighing up to ten times their own mass over dozens of meters. During this thesis, we studied ant locomotion and how it was affected by load transport. We investigated three aspects of locomotion: leg kinematics, center of mass dynamics and energetic expenditure associated with locomotion. We especially looked into the effect of ant mass on load transport. Indeed, the polymorphism of the worker caste of the ant species we studied, Messor barbarus, is characterized by allometric relationships, which implies that locomotion and/or load transport could be different for workers of different sizes. We also examined the effect of different relative mass of the loads carried. We found that big ants have a different locomotor pattern than small ants, probably because they have to compensate for the imbalance caused by their relatively bigger head. During load transport, the locomotor pattern does…

Advisors/Committee Members: Fourcassié, Vincent (thesis director), Moretto, Pierre (thesis director).

Subjects/Keywords: Fourmis; Locomotion; Transport de charge; Biomécanique; Energétique; Ants; Locomotion; Load transport; Biomechanics; Energetics

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APA (6^th Edition):

Merienne, H. (2019). Biomécanique et énergétique de la locomotion et du transport de charge chez la fourmi : Biomechanics and energetics of locomotion and load transport in ants. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2019TOU30257

Chicago Manual of Style (16^th Edition):

Merienne, Hugo. “Biomécanique et énergétique de la locomotion et du transport de charge chez la fourmi : Biomechanics and energetics of locomotion and load transport in ants.” 2019. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed February 27, 2021. http://www.theses.fr/2019TOU30257.

MLA Handbook (7^th Edition):

Merienne, Hugo. “Biomécanique et énergétique de la locomotion et du transport de charge chez la fourmi : Biomechanics and energetics of locomotion and load transport in ants.” 2019. Web. 27 Feb 2021.

Vancouver:

Merienne H. Biomécanique et énergétique de la locomotion et du transport de charge chez la fourmi : Biomechanics and energetics of locomotion and load transport in ants. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2019. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2019TOU30257.

Council of Science Editors:

Merienne H. Biomécanique et énergétique de la locomotion et du transport de charge chez la fourmi : Biomechanics and energetics of locomotion and load transport in ants. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2019. Available from: http://www.theses.fr/2019TOU30257

University of Minnesota

22. Ghosh, Soumen. Static and Dynamic Charge and Energy Transport in Organic Electronics.

Degree: PhD, Chemistry, 2018, University of Minnesota

URL: http://hdl.handle.net/11299/200186

► Organic electronic materials are a new generation of materials that have the potential to move our society to clean and renewable energy sources, but the… (more)

Subjects/Keywords: Charge transport; Density functional theory; Electronic structure methods; Energy transport; Organic elctronics; Real-time dynamics

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APA (6^th Edition):

Ghosh, S. (2018). Static and Dynamic Charge and Energy Transport in Organic Electronics. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/200186

Chicago Manual of Style (16^th Edition):

Ghosh, Soumen. “Static and Dynamic Charge and Energy Transport in Organic Electronics.” 2018. Doctoral Dissertation, University of Minnesota. Accessed February 27, 2021. http://hdl.handle.net/11299/200186.

MLA Handbook (7^th Edition):

Ghosh, Soumen. “Static and Dynamic Charge and Energy Transport in Organic Electronics.” 2018. Web. 27 Feb 2021.

Vancouver:

Ghosh S. Static and Dynamic Charge and Energy Transport in Organic Electronics. [Internet] [Doctoral dissertation]. University of Minnesota; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11299/200186.

Council of Science Editors:

Ghosh S. Static and Dynamic Charge and Energy Transport in Organic Electronics. [Doctoral Dissertation]. University of Minnesota; 2018. Available from: http://hdl.handle.net/11299/200186

23. Stepanov, Petr. Spin and Charge Transport in Monolayer and Trilayer Graphene in the Quantum Hall Regime.

Degree: PhD, Physics, 2018, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1532103607994675

► Graphene, a two-dimensional carbon honeycomb lattice, has generated immense interest within the condensed matter physics community due to its fascinating electrical, optical, and mechanical properties.… (more)

▼ Graphene, a two-dimensional carbon honeycomb lattice, has generated immense interest within the condensed matter physics community due to its fascinating electrical, optical, and mechanical properties. The differences in band structure of mono-, bi- and tri-layer graphene give rise to drastically different electronic ground state configurations and competing symmetries (such as spin, valley, orbital, and layer). Recent efforts have significantly improved electronic its charge carrier mobility and enabled the observation of a number of exciting phenomena in monolayer and few layer graphene. In this thesis we present an experimental study of spin transport through monolayer graphene antiferromagnet insulator (AFMI), and quantum Hall (QH) phases in multiple Dirac band trilayer graphene, which provide further insight into both single-particle and many-body physics in these exciting two-dimensional (2D) systems.These projects require samples of exceptional quality. To this end, I, together with Nathaniel Gillgren, developed a dry transfer technique (first pioneered by the Columbia group), in order to fabricate graphene devices encapsulated within hexagonal boron nitride (hBN) layers. Since hBN sheets are atomically flat and host very few trapped charges and defects, they are ideal substrates for graphene devices, which boost chargecarrier mobility as high as ˜ 10⁵. In my research these ultraclean devices enabled theresolution of symmetry-broken quantum Hall phases and fractional quantum Hall states, as well as the establishment of an antiferromagnetic insulator the affords long distance spin transport.In the first part of thesis, we focus on the observation of tunable symmetries of the integer and fractional quantum Hall (QH) states in ABA-stacked trilayer graphene, which hosts multiple Dirac bands. At finite doping and in the quantum Hall regime, we use transport measurements to map the Landau levels of hBN-encapsulated ABA-stacked trilayer graphene as a function of charge carrier density n, magnetic field B, and interlayer displacement field D. We observe the transitions among states with different spin, valley, orbital, and parity polarizations. This extremely rich pattern arises from crossings between Landau levels from different sub-bands, which reflects the evolving symmetries that are tunable in situ. Notable, we observe fractional QH (FQH) states at filling factors 2/3 and -11/3 at ¿ = 0. Unlike those in bilayer graphene, these FQH states are destabilized by a small interlayer potential that hybridizes the different Dirac bands.At the charge neutrality point (CNP), trilayer graphene displays a striking phase diagram. Here, we discover a new class of QH effect, the quantum parity Hall (QPH) effect, in which boundary channels are distinguished by even or odd parity under the system’s mirror reflection symmetry. Quantized conductance is first observed at low perpendicular magnetic field ¿2 at ¿xx = 4e2/h, confirming the presence of four edge channels that travel from source to drain. As ¿2 increases, the quantized… Advisors/Committee Members: Lau, Chun Ning (Advisor).

Subjects/Keywords: Physics; Condensed Matter Physics; Experiments; Charge transport, spin transport, monolayer graphene, trilayer graphene, graphene antiferromagnet

10 more images…

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APA (6^th Edition):

Stepanov, P. (2018). Spin and Charge Transport in Monolayer and Trilayer Graphene in the Quantum Hall Regime. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1532103607994675

Chicago Manual of Style (16^th Edition):

Stepanov, Petr. “Spin and Charge Transport in Monolayer and Trilayer Graphene in the Quantum Hall Regime.” 2018. Doctoral Dissertation, The Ohio State University. Accessed February 27, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1532103607994675.

MLA Handbook (7^th Edition):

Stepanov, Petr. “Spin and Charge Transport in Monolayer and Trilayer Graphene in the Quantum Hall Regime.” 2018. Web. 27 Feb 2021.

Vancouver:

Stepanov P. Spin and Charge Transport in Monolayer and Trilayer Graphene in the Quantum Hall Regime. [Internet] [Doctoral dissertation]. The Ohio State University; 2018. [cited 2021 Feb 27]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1532103607994675.

Council of Science Editors:

Stepanov P. Spin and Charge Transport in Monolayer and Trilayer Graphene in the Quantum Hall Regime. [Doctoral Dissertation]. The Ohio State University; 2018. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1532103607994675

University of California – Irvine

24. Mazaheripour, Amir. Length- and Sequence-Controlled Organic Semiconductors.

Degree: Materials Science and Engineering, 2016, University of California – Irvine

URL: http://www.escholarship.org/uc/item/3nr5c56x

► Organic semiconductors have shown promise not only as alternative materials for silicon- based devices, but also as a gateway to a new paradigm of printable,… (more)

Subjects/Keywords: Materials Science; Nanotechnology; Physics; charge transport; nanomaterials; organic electronics; organic semiconductors

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APA (6^th Edition):

Mazaheripour, A. (2016). Length- and Sequence-Controlled Organic Semiconductors. (Thesis). University of California – Irvine. Retrieved from http://www.escholarship.org/uc/item/3nr5c56x

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):

Mazaheripour, Amir. “Length- and Sequence-Controlled Organic Semiconductors.” 2016. Thesis, University of California – Irvine. Accessed February 27, 2021. http://www.escholarship.org/uc/item/3nr5c56x.

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

MLA Handbook (7^th Edition):

Mazaheripour, Amir. “Length- and Sequence-Controlled Organic Semiconductors.” 2016. Web. 27 Feb 2021.

Vancouver:

Mazaheripour A. Length- and Sequence-Controlled Organic Semiconductors. [Internet] [Thesis]. University of California – Irvine; 2016. [cited 2021 Feb 27]. Available from: http://www.escholarship.org/uc/item/3nr5c56x.

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

Council of Science Editors:

Mazaheripour A. Length- and Sequence-Controlled Organic Semiconductors. [Thesis]. University of California – Irvine; 2016. Available from: http://www.escholarship.org/uc/item/3nr5c56x

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

University of California – Berkeley

25. Phipps, Arran Thomas James. Ionization Collection in Detectors of the Cryogenic Dark Matter Search.

Degree: Physics, 2016, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/53t6s5pw

► Determining the composition of dark matter is at the forefront of modern scientific research. There is compelling evidence for the existence of vast quantities of… (more)

▼ Determining the composition of dark matter is at the forefront of modern scientific research. There is compelling evidence for the existence of vast quantities of dark matter throughout the universe, however it has so-far eluded all direct detection efforts and its identity remains a mystery. Weakly interacting massive particles (WIMPs) are a favored dark matter candidate and have been the primary focus of direct detection for several decades. The Cryogenic Dark Matter Search (CDMS) has developed the Z-dependent Ionization and Phonon (ZIP) detector to search for such particles. Typically made from germanium, these detectors are capable of distinguishing between electromagnetic background and a putative WIMP signal through the simultaneous measurement of ionization and phonons produced by scattering events. CDMS has operated several arrays of these detectors at the Soudan Underground Laboratory (Soudan, MN, USA) resulting in many competitive (often world-leading) WIMP exclusion limits. This dissertation focuses on ionization collection in these detectors under the sub-Kelvin, low electric field, and high crystal purity conditions unique to CDMS. The design and performance of a fully cryogenic HEMT-based amplifier capable of achieving the SuperCDMS SNOLAB ionization energy resolution goal of 100 eVee is presented. The experimental apparatus which has been used to record electron and hole properties under CDMS conditions is described. Measurements of charge transport, trapping, and impact ionization as a function of electric field in two CDMS detectors are shown, and the ionization collection efficiency is determined. The data is used to predict the error in the nuclear recoil energy scale under both CDMSlite and iZIP operating modes. A two species, two state model is developed to describe how ionization collection and space charge generation in CDMS detectors are controlled by the presence of ``overcharged'' D^- donor and A⁺ acceptor impurity states. The thermal stability of these states is exclusive to sub-Kelvin operation, explaining why ionization collection in CDMS detectors differs from similar semiconductor detectors operating at higher temperature. This work represents a solid foundation for the understanding ionization collection in CDMS detectors.

Subjects/Keywords: Physics; charge transport; dark matter; hemt amplifier; overcharged states

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APA (6^th Edition):

Phipps, A. T. J. (2016). Ionization Collection in Detectors of the Cryogenic Dark Matter Search. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/53t6s5pw

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):

Phipps, Arran Thomas James. “Ionization Collection in Detectors of the Cryogenic Dark Matter Search.” 2016. Thesis, University of California – Berkeley. Accessed February 27, 2021. http://www.escholarship.org/uc/item/53t6s5pw.

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

MLA Handbook (7^th Edition):

Phipps, Arran Thomas James. “Ionization Collection in Detectors of the Cryogenic Dark Matter Search.” 2016. Web. 27 Feb 2021.

Vancouver:

Phipps ATJ. Ionization Collection in Detectors of the Cryogenic Dark Matter Search. [Internet] [Thesis]. University of California – Berkeley; 2016. [cited 2021 Feb 27]. Available from: http://www.escholarship.org/uc/item/53t6s5pw.

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

Council of Science Editors:

Phipps ATJ. Ionization Collection in Detectors of the Cryogenic Dark Matter Search. [Thesis]. University of California – Berkeley; 2016. Available from: http://www.escholarship.org/uc/item/53t6s5pw

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

University of California – Berkeley

26. Wiers, Brian Michael. Charge Transport In Metal-Organic Frameworks.

Degree: Chemistry, 2015, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/8jh064hp

► This dissertation documents efforts to synthesize and measure ionically and electronically conductive porous, three-dimensional metal-organic frameworks. Chapter 1 introduces concepts of conductivity, mixed-valency, measurement techniques… (more)

Subjects/Keywords: Chemistry; charge transport; conductivity; field effect transistors; Metal-organic frameworks

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APA (6^th Edition):

Wiers, B. M. (2015). Charge Transport In Metal-Organic Frameworks. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/8jh064hp

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):

Wiers, Brian Michael. “Charge Transport In Metal-Organic Frameworks.” 2015. Thesis, University of California – Berkeley. Accessed February 27, 2021. http://www.escholarship.org/uc/item/8jh064hp.

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

MLA Handbook (7^th Edition):

Wiers, Brian Michael. “Charge Transport In Metal-Organic Frameworks.” 2015. Web. 27 Feb 2021.

Vancouver:

Wiers BM. Charge Transport In Metal-Organic Frameworks. [Internet] [Thesis]. University of California – Berkeley; 2015. [cited 2021 Feb 27]. Available from: http://www.escholarship.org/uc/item/8jh064hp.

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

Council of Science Editors:

Wiers BM. Charge Transport In Metal-Organic Frameworks. [Thesis]. University of California – Berkeley; 2015. Available from: http://www.escholarship.org/uc/item/8jh064hp

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

University of California – Riverside

27. Pi, Keyu. Electronic and Spintronic Properties of Graphene.

Degree: Physics, 2010, University of California – Riverside

URL: http://www.escholarship.org/uc/item/6xf233bh

► In this thesis, I summarize our studies investigating the electronic properties and spintronic properties of transition metal doped graphene over the last six years. In… (more)

Subjects/Keywords: Physics, Condensed Matter; Charge scattering; Graphene; Semiconductor; Spin; Spintronic; transport

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APA (6^th Edition):

Pi, K. (2010). Electronic and Spintronic Properties of Graphene. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/6xf233bh

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):

Pi, Keyu. “Electronic and Spintronic Properties of Graphene.” 2010. Thesis, University of California – Riverside. Accessed February 27, 2021. http://www.escholarship.org/uc/item/6xf233bh.

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

MLA Handbook (7^th Edition):

Pi, Keyu. “Electronic and Spintronic Properties of Graphene.” 2010. Web. 27 Feb 2021.

Vancouver:

Pi K. Electronic and Spintronic Properties of Graphene. [Internet] [Thesis]. University of California – Riverside; 2010. [cited 2021 Feb 27]. Available from: http://www.escholarship.org/uc/item/6xf233bh.

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

Council of Science Editors:

Pi K. Electronic and Spintronic Properties of Graphene. [Thesis]. University of California – Riverside; 2010. Available from: http://www.escholarship.org/uc/item/6xf233bh

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

University of Toronto

28. Jeong, Junho. Optical, Structural, and Electrical Characterization of Colloidal Nanocrystalline Silicon.

Degree: 2013, University of Toronto

URL: http://hdl.handle.net/1807/42972

►

In this thesis, colloidal nanocrystalline silicon (ncSi) capped with allylbenzene (AB) groups, is created using a sol-gel method. This novel material, AB-ncSi, is size separated… (more)

Subjects/Keywords: Silicon Nanocrystal; Photoluminescence; Size-Selective; Conductivity; Charge Transport; 0544

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APA (6^th Edition):

Jeong, J. (2013). Optical, Structural, and Electrical Characterization of Colloidal Nanocrystalline Silicon. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/42972

Chicago Manual of Style (16^th Edition):

Jeong, Junho. “Optical, Structural, and Electrical Characterization of Colloidal Nanocrystalline Silicon.” 2013. Masters Thesis, University of Toronto. Accessed February 27, 2021. http://hdl.handle.net/1807/42972.

MLA Handbook (7^th Edition):

Jeong, Junho. “Optical, Structural, and Electrical Characterization of Colloidal Nanocrystalline Silicon.” 2013. Web. 27 Feb 2021.

Vancouver:

Jeong J. Optical, Structural, and Electrical Characterization of Colloidal Nanocrystalline Silicon. [Internet] [Masters thesis]. University of Toronto; 2013. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1807/42972.

Council of Science Editors:

Jeong J. Optical, Structural, and Electrical Characterization of Colloidal Nanocrystalline Silicon. [Masters Thesis]. University of Toronto; 2013. Available from: http://hdl.handle.net/1807/42972

University of Toronto

29. Gretton, Michael James. A Study of the Scope, Limitations and Kinetics of the Siliconization of Triarylamines Using Tris(pentafluorophenyl)borane Catalysis.

Degree: 2012, University of Toronto

URL: http://hdl.handle.net/1807/33226

►

Piers-Rubinsztajn (P-R) conditions, involving catalysis by tris(pentafluorophenyl)borane, were applied to siliconize triarylamines. A phenylated linear methylhydrosiloxane copolymer was utilized to create a hydrolytically-stable composite with… (more)

Subjects/Keywords: charge transport; metal-free catalysis; silicones; functionalization; functional group; finishing; 0495

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APA (6^th Edition):

Gretton, M. J. (2012). A Study of the Scope, Limitations and Kinetics of the Siliconization of Triarylamines Using Tris(pentafluorophenyl)borane Catalysis. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/33226

Chicago Manual of Style (16^th Edition):

Gretton, Michael James. “A Study of the Scope, Limitations and Kinetics of the Siliconization of Triarylamines Using Tris(pentafluorophenyl)borane Catalysis.” 2012. Masters Thesis, University of Toronto. Accessed February 27, 2021. http://hdl.handle.net/1807/33226.

MLA Handbook (7^th Edition):

Gretton, Michael James. “A Study of the Scope, Limitations and Kinetics of the Siliconization of Triarylamines Using Tris(pentafluorophenyl)borane Catalysis.” 2012. Web. 27 Feb 2021.

Vancouver:

Gretton MJ. A Study of the Scope, Limitations and Kinetics of the Siliconization of Triarylamines Using Tris(pentafluorophenyl)borane Catalysis. [Internet] [Masters thesis]. University of Toronto; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1807/33226.

Council of Science Editors:

Gretton MJ. A Study of the Scope, Limitations and Kinetics of the Siliconization of Triarylamines Using Tris(pentafluorophenyl)borane Catalysis. [Masters Thesis]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/33226

University of Connecticut

30. DeGostin, Matthew B. Three-Dimensional Microstructural Imaging and Charge Transport Modeling Tools for Fuel Cell Materials.

Degree: MS, Mechanical Engineering, 2015, University of Connecticut

URL: https://opencommons.uconn.edu/gs_theses/836

► Fuel cells and other electrochemical energy storage and conversion technologies are increasingly being used as clean energy alternatives for mobile and stationary power generation.… (more)

Subjects/Keywords: fuel cell; x-ray nanotomography; electrode; charge transport; analytical models

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APA (6^th Edition):

DeGostin, M. B. (2015). Three-Dimensional Microstructural Imaging and Charge Transport Modeling Tools for Fuel Cell Materials. (Masters Thesis). University of Connecticut. Retrieved from https://opencommons.uconn.edu/gs_theses/836

Chicago Manual of Style (16^th Edition):

DeGostin, Matthew B. “Three-Dimensional Microstructural Imaging and Charge Transport Modeling Tools for Fuel Cell Materials.” 2015. Masters Thesis, University of Connecticut. Accessed February 27, 2021. https://opencommons.uconn.edu/gs_theses/836.

MLA Handbook (7^th Edition):

DeGostin, Matthew B. “Three-Dimensional Microstructural Imaging and Charge Transport Modeling Tools for Fuel Cell Materials.” 2015. Web. 27 Feb 2021.

Vancouver:

DeGostin MB. Three-Dimensional Microstructural Imaging and Charge Transport Modeling Tools for Fuel Cell Materials. [Internet] [Masters thesis]. University of Connecticut; 2015. [cited 2021 Feb 27]. Available from: https://opencommons.uconn.edu/gs_theses/836.

Council of Science Editors:

DeGostin MB. Three-Dimensional Microstructural Imaging and Charge Transport Modeling Tools for Fuel Cell Materials. [Masters Thesis]. University of Connecticut; 2015. Available from: https://opencommons.uconn.edu/gs_theses/836

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Open Access Theses and Dissertations