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 17 of 17 for “"Multicrystalline silicon"”.
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Texturization of multicrystalline silicon solar cells
A significant efficiency gain for crystalline silicon solar cells can be achieved by surface texturization. This research was directed at developing a low-cost, high-throughput and reliable texturing method that can create a honeycomb texture. Two distinct approaches for surface texturization were …
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Dislocation density reduction in multicrystalline silicon through cyclic annealing
Multicrystalline silicon solar cells are an important renewable energy technology that have the potential to provide the world with much of its energy. While they are relatively inexpensive, their efficiency is limited by material defects, and in particular by dislocations. Reducing dislocation …
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Characterization of residual stresses in birefringent materials applied to multicrystalline silicon wafers
… retardation in crystalline materials. Single and multicrystalline silicon was chosen as the model material. Silicon is an interesting and important material in its own right, and the use of photoelasticity to determine stresses at linear and planar defects can have important consequences in the …
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Formation of screen-printed contacts on multicrystalline silicon (mc-Si) solar cells
Commercial multicrystalline silicon (me-Si) solar cells use screen-printing process for depositing both the Ag paste based gridded front and Al based back (whole area) metal contacts.. This thesis relates to experimental and theoretical studies of contact formation mechanisms in silicon solar …
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Root cause defect identification in multicrystalline silicon for improved photovoltaic module reliability
… substrate to enable this scale-up is cast multicrystalline silicon (mc-Si) due to its low operating cost and capital requirements compared to other technologies. However, a new form of light-induced degradation was discovered when transitioning mc-Si to the latest high efficiency device …
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Sacrificial high-temperature phosphorus diffusion gettering for lifetime improvement of multicrystalline silicon wafers
… lifetime-limiting impurities in crystalline silicon solar cells. In as-grown material, iron is present in precipitates and in point defects. To achieve conversion efficiencies in excess of 20%, bulk minority-carrier lifetimes in excess of 300 Rs (p-type) are required [1]. For cost-effective …
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Surface and bulk passivation of multicrystalline silicon solar cells by silicon nitride (H) layer : modeling and experiments
… and bulk passivation by hydrogen-rich PECVD silicon nitride (SiN :H) antireflection layer on multicrystalline silicon (me-Si) solar cells. The passivation of silicon surface can be achieved in two ways: by field-effect passivation and/or by neutralization of interface states. In other words, …
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High-temperature defect engineering for silicon solar cells : predictive process simulation and synchrotron-based microcharacterization
… a major lever for cost reduction in crystalline silicon solar cells, which dominate the photovoltaics market but cannot yet compete subsidy-free in most areas. Iron impurities are a key performance-limiting defect present in commercial and precommercial silicon solar cell materials, affecting …
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Applications of Spectrally-Resolved Photoluminescence in Silicon Photovoltaics
… emitted from different structures in crystalline silicon wafers and solar cells. Based on the knowledge accumulated, it also establishes a variety of applications of photoluminescence spectroscopy in silicon photovoltaics. The thesis may be divided into 3 main categories: band-to-band luminescence …
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Applications of Spectrally-Resolved Photoluminescence in Silicon Photovoltaics
… emitted from different structures in crystalline silicon wafers and solar cells. Based on the knowledge accumulated, it also establishes a variety of applications of photoluminescence spectroscopy in silicon photovoltaics. The thesis may be divided into 3 main categories: band-to-band luminescence …
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Influence of defects and impurities on solar cell performance
Multicrystalline silicon (mc-Si) solar cells exhibit high impurity content and higher density of crystal defects such as grain boundaries, dislocations, stacking faults and impurity precipitates. Even though the effect of dislocations on mc-Si solar cell performance has been studied, a severe lack …
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Electrical impact assessment of dislocations in silicon materials for solar cells
Cast multicrystalline silicon (mc-Si) makes up about 60% of the global photovoltaics market production, and is favored due to its lower areal and capex costs relative to monocrystalline silicon. This method, however, produces material with a higher density of defects (e.g., dislocations, grain …
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Metal impurities in n-type crystalline silicon for photovoltaics : simulation, synchrotron-based characterization, and mitigation
Crystalline silicon is the dominant technology in the rapidly-growing photovoltaics (PV) industry, but significant cost reduction is still required before widespread grid parity is achieved. One-quarter of the cost of a PV module is the Si wafer. One way to reduce the cost/kWh of PV is to identify …
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Detecting and gettering chromium impurities in photovoltaic crystalline silicon
… harnessing solar energy. Currently, crystalline silicon dominates the PV market with an approximate market share of 90% and record solar cell efficiencies greater than 20%. However, the PV market must decrease the cost to the consumer to maintain growth and meet global electricity demands. …
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Hot-wire chemical vapour deposition of nanocrystalline silicon and silicon nitride : growth mechanisms and filament stability
Nanocrystalline silicon (nc-Si:H) is an interesting type of silicon with superior electrical properties that are more stable compared to amorphous silicon (a-Si:H). Silicon nitride (SiNₓ) thin films are currently the dielectric widely applied in the microelectronics industry and are also effective …
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Development and application of the scanning Kelvin probe for solar cell defect analysis.
… top of the Si3Ni4 passivation layer on a mc-Si (Multicrystalline silicon) solar cell. Furthermore a high resolution SKP has successfully produced images showing direct evidence of polytype related surface potential variations caused by the surface orientations of mc-Si. The Kelvin probe was …
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High Voltage Bias Testing And Degradation Analysis Of Photovoltaic Modules
… of reliability and durability of crystalline silicon module. Grid-connected photovoltaic systems must withstand high voltage bias in addition to harsh environmental conditions such as intermittent solar irradiance, high humidity, heat and wind. a-Si:H thin-film photovoltaic modules with …