Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 126 for “"Photovoltaic devices"”.
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Overcoming Efficiency Limits in Photovoltaic Devices
Photovoltaic devices have an efficiency limit of 33% set by fundamental loss processes in the semiconductor materials. The largest loss comes about as a result of charges excited far above the bandgap losing their excess energy as they cool to the bandedge, a process known as thermalisation. …
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Photovoltaic devices using photosynthetic protein complexes
… spinach chloroplasts. Electronic integration of devices is achieved by depositing organic semiconducting protective layer over a self-assembled monolayer of photosynthetic reaction centers oriented via an engineered metal-affinity polyhistidine tag. Various analytical and spectroscopic techniques …
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Metal oxide/organic interface investigations for photovoltaic devices
… oxide / organic interfaces in photo- voltaic devices. It focuses on device instabilities originating from the metal oxide layer surface sensitivity and it presents suggested mechanisms behind these in- stabilities. A simple sol-gel solution deposition technique for the fabrication of stable …
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Production and characterisation of nanoparticulate silicon photovoltaic devices
… characterisation show that the printed devices exhibit electrical properties characteristic of silicon PV devices, confirming that the experimental process followed resulted in the successful production of a functional silicon solar cell. This thesis outlines the particle production …
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Automated High-Throughput Characterization of Perovskite Photovoltaic Devices
Material science is a critical discipline that supports all other science and engineering disciplines, however current research processes are inefficient and limiting the pace of research. Automated high-throughput characterization shows potential to accelerate this research pace. This thesis …
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Dual Spin-Cast Thermally Interdiffused Polymeric Photovoltaic Devices
… interdiffused concentration gradient polymer photovoltaic devices is carried out with particular attention to the effect of the thickness and the thermal treatments on the power conversion efficiency, short circuit current, open circuit voltage and other key electrical properties. Bilayer …
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Sulfur Implanted GaSb for Non-Epitaxial Photovoltaic Devices
… of various infrared-based optoelectronic devices, particularly thermophotovoltaics (TPV). In order to make GaSb-based technologies like TPV more widely available, non-epitaxial dop- ing methods for GaSb must be pursued. Ion implantation is relatively unexplored for GaSb, and can offer …
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Germanium on silicon heteroepitaxy for high efficiency photovoltaic devices
Optoelectronic devices based on III-V direct gap semiconductors enable efficient energy conversion for photovoltaic cells, light emission for LEDs, and on-chip communication via various microphotonic components. However, widespread adoption of III-V solar cells is limited by the expensive Germanium …
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Low Dose Analytical Electron Microscopy of Hybrid Perovskite Photovoltaic Devices
The rapid ascent of perovskite photovoltaics over the past decade has enabled this technology to now stand on the cusp of commercialisation. However, a successful entry into the market will only be feasible if the power conversion efficiencies of perovskite solar modules can at least approach those …
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Approaching Novel Perovskites Photovoltaic Devices through Machine Learning and Interfacial Engineering
… which make them good candidates for various photovoltaic applications [1-5]. The fascinating optoelectronic properties of perovskite largely take credit to their low exciton binding energy, strong light absorption coefficient, relatively long carrier diffusion length, and carrier …
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Spectroscopic ellipsometry and dielectric modeling of thin film CdTe/CdS photovoltaic devices
… of each layer in heterostructured, thin-film photovoltaic devices. The aim of this thesis is to assess the capability of SE to resolve changes associated with illumination in the dielectric function of the absorbing layer of CdTe/CdS photovoltaic devices. Subsequently, this thesis aims to …
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Surface modification and characterization of zinc oxide for use in organic photovoltaic devices
Includes bibliographical references (pages 149-177).
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Hydrothermal synthesis of Al-doped ZnO nanowires and their application for photovoltaic devices
… candidates for next-generation optoelectronic devices, including solar cells and light-emitting diodes. However, the realization of nanostructured materials for solar cell device applications is limited by the fundamental trade-off between light absorption and photocarrier collection. …
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Polymer/Fullerene Photovoltaic Devices - Nanoscale Control of the Interface by Thermally-controlled Interdiffusion
… and the electron acceptor fullerene in organic photovoltaic devices is studied. Starting from a bilayer system of donor and acceptor materials, the proximity of polymer and fullerene throughout the bulk of the devices is improved by inducing an interdiffusion of the two materials by heating the …
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Chemical bath deposition and electrodeposition of epitaxial semiconductor materials for application in photovoltaic devices
"This dissertation investigates the chemical bath deposition of zinc oxide and electrodeposition of cuprous iodide on polycrystalline and single crystal substrates. Paper I describes the chemical bath deposition and characterization of titled epitaxial zinc oxide nanospears on Si(001) single …
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Self-standing sub-cellular sized PhotoVoltaic devices for minimally-invasive and precise Neuronal Stimulation
… designing for the first time sub-cellular sized Photovoltaic devices which can do spatio-temporally precise neuron stimulation. These devices are based on thin-film Organic Photovoltaic technology. The stimulating devices are roughly 250 nm in thickness and a few micrometers in size ( 5um in …
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Single crystal and polycrystalline copper indium selenide deposited by the hybrid sputtering and evaporation method for photovoltaic devices
The results presented here impact the CuInSe$\sb2$ solar cells community in three areas: (1) fundamental understanding of CuInSe$\sb2$ growth and properties, (2) development and optimization of a potentially scalable deposition technique, and (3) improvement in solar cell performance based on a …
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