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 28 for “"Photovoltaic performance"”.
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Understanding electronic and optical properties of PbS QDs for improved photovoltaic performance
Photovoltaic (PV) solar cells that constitute semiconducting sunlight absorber and metallic electrical contacts convert solar energy to electricity. Even though silicon represents roughly 90% of installed solar PV capacity as the clear current leader among PV technology, another class of …
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Porous One Dimensional Photonic Crystals for Enhanced Photovoltaic Performance of Dye Solar Cells
In the context of photovoltaics, dye solar cells (DSCs) constitute an interesting choice to solid state semiconductor devices since they are expected to meet not only relatively high efficiency values but also non conventional functionalities that could p
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Enhancing the Photovoltaic Performance of P3HT/PDIB Silsesquioxane Donor-Acceptor System Using Spray Deposition Fabrication Technique
… by meeting the demands for cost effective photovoltaic devices. To date, the focus of the organic photovoltaic devices has been on the optimization of the processing the materials to improve photo conversion efficiency and also by modifying the active components of the organic materials. …
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All-solid-state front-illuminated titania nanotube-based dye-sensitized solar-cells
… particle size proved essential for the favorable performance of the produced solar cells. Front-illuminated nanotube-based dye-sensitized solar cells with light conversion efficiency up to 2% are fabricated. The cell photovoltaic performance can last for at least two months with proper sealing …
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Fabrication and characterization of AgBiS2 and BiSI light harvesting materials for thin film solar cell application
… AgBiS2 and BiSI compounds' optimization for high-performance solar cell application. Firstly, the effects of solvent, composition ratio, and heat treatment temperature are carefully studied on the structural, optical, and electrical properties of the single phase AgBiS2 thin film prepared by the …
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Optoelectronic applications of solution-processable sulfide semiconductors
… sulfoiodide (SbSI). The improvement of the photovoltaic performance in Sb$_2$S$_3$ sensitized solar cells upon the controlled partial oxidation of the absorber layer is investigated. A reduction in charge carrier recombination is the reason for the improved efficiency, caused by the …
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Using Molecular Design to Influence Intermolecular Interactions
… hexabenzocoronene (HBC) derivatives to improve photovoltaic performance. First, the interaction between contorted HBC derivatives with varying degrees of "bowl" character and fullerenes are explored in solution. Association constants were determined by fluorescence quenching experiments with …
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Optimising BIPV in High-Rise Buildings in Hot Climates: A Parametric Study and Design Tool
Building-integrated photovoltaics (BIPV) offer strong potential for high-rise buildings in hot climates, but practical adoption remains limited. This thesis investigates how structural parameters affect the natural ventilation cooling and electrical performance of high-rise BIPV systems, and …
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Organic solar cells based on liquid crystalline and polycrystalline thin films
… 10% are possible in principle. However, their performance is often limited due to small exciton diffusion lengths and poor transport properties which may be attributed to the amorphous nature of most organic semiconductors.Discotic liquid crystal (DLC) copper phthalocyanine was investigated as …
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Nanostructured architectures for colloidal quantum dot solar cells
… light-emitting diodes. Despite rapid advances in performance, however, modern QD solar cells remain limited by a fundamental trade-o between light absorption and photocarrier collection due to poor electronic transport. Vertically aligned arrays of ZnO nanowires can decouple absorption and …
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Defects and charge-carrier lifetime in early-stage photovoltaic materials : relating experiment to theory
… shifting reliance away from fossil fuels. Solar photovoltaic (PV) modules are well suited for reducing emissions; however, manufacturing and capital costs must continue to decline for rapid, worldwide PV adoption. Low-cost and Earth-abundant "thin film" materials offer potential in spurring PV …
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Photovoltaic properties and size-pH phase stability of iron disulfide from density-functional theory
… the biggest challenge preventing its use in photovoltaic devices. Two widely-accepted causes are: (i) Fermi level pinning caused by intrinsic surface states that appear as gap states; (ii) presence of the polymorph marcasite. Based on density-functional theory (DFT) calculations, (i) the …
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Electron Microscopy Studies of Hybrid Perovskite Solar Cells
… of the cells were related to different photovoltaic performance, providing instructive indications for the synthesis and fabrication routes of the devices. Finally, the main degradation processes that affect perovskite solar cells were probed. STEM-EDX was used in conjunction with the …
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Metal oxide nanostructures and hybrid perovskite semiconductor for photovoltaic application
… in 2009. This technology has invigorated the photovoltaic (PV) community. While it has taken 15-42 years for traditional PV technologies to achieve maturity, PSC technology has accomplished the same within 10 years. As of late, hybrid perovskite materials have shown incredible possibilities …
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The Development and Application of a Simplified Thermal Performance Equation for a Sheet-and-Tube Photovoltaic Thermal Combi-Panel
… is the combination of solar thermal and photovoltaics - two mature and widely understood technologies. Combining the two technologies complicates existing standardized rating procedures and performance modeling methods. Currently a standardized performance test method does not exist for …
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Transient Photophysics of Bismuth Halide Semiconductors for Optoelectronic Applications
… — have all been demonstrated in thin film photovoltaic devices fabricated at low temperatures. Propelled by the success of lead halide perovskites, this work forms part of the search for defect tolerant, non-toxic and stable materials for next-generation solar cells. I use transient …
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Chemical Modifications and Passivation Approaches in Metal Halide Perovskite Solar Cells
… and optoelectronic properties leading to higher photovoltaic performance of the resulting perovskite solar cells. We also performed thorough experimental characterizations together with modeling to further understand the chemical distribution and local structure of perovskite films upon …
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Materials and design strategies for solar microcells
My thesis describes how photovoltaic performance can be improved by careful engineering and incorporation of optical elements and materials external to the devices. These optical elements and materials include periodically nanostructured semi-transparent metallic reflectors that are integrated …
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Ultrafast Spectroscopic Studies of Solution-Processing Organic Photovoltaic Materials and Devices
… as well as in-door and building-integrated photovoltaics, owing to features such as low-temperature processing, light weight and flexibility, and synthetic versatility. Due to the development of new materials systems with unique optoelectronic properties, a breakthrough in the OSC …
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Next generation optoelectronic devices for energy applications utilising metal oxides, bismuth oxyhalides and lead halide perovskites
… rapidly emerged as a contender for commercial photovoltaic applications. Among its many advantages, one of the most important is that LHPs can be paired with silicon solar cells, which currently dominate the photovoltaics market. This is because LHP absorb in the visible wavelength range, which …
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