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 15 of 15 for “"Microcrystalline silicon"”.
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Thermally stimulated currents and photoconductivity in microcrystalline silicon
This thesis focuses on the characterization of microcrystalline silicon ( c-Si:H) samples by numerically simulated and experimental thermally stimulated currents (TSC). TSC measurements and simulations demonstrate in detail two different retrapping regimes (strong and weak). A combined experiment - …
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Fabrication and characterization of microcrystalline silicon solar cells
In this study, single junction p-i-n uc-Si:H solar cells were prepared using plasma of silane diluted by hydrogen in a low-cost, single chamber, non-load-locked RF-PECVD system. Direct structural characterization of uc-Si:H solar cells, rather than stand-alone films, was conducted using Raman …
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Modeling, design and fabrication of thin-film microcrystalline silicon solar cells
… design and fabrication of low-cost thin-film microcrystalline silicon(ucSi) solar cells is studied in this thesis. The cell, considered in this investigation, utilizes low-cost glass as the substrate and microcrystalline Si (uc-Si) as the active layer. A comprehensive refractive index (n) and …
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In-situ Raman spectroscopy : a method to study and control the growth of microcrystalline silicon for thin-film solar cells
Optimum performance of a microcrystalline silicon (µc-Si:H) thin-film solar cell is achieved if the absorber layer material is deposited close to the phase transition towards amorphous Silicon. Hence exact knowledge about and control of the deposition process is of great importance. This work deals …
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A real-time study of hydrogenated amorphous silicon, microcrystalline silicon, and amorphous silicon carbide growth by optically enhanced infrared reflectance spectroscopy
… the deposition of hydrogenated amorphous silicon (a-Si:H), microcrystalline silicon ($\mu$c-Si:H), and hydrogenated amorphous silicon carbide $\rm (a-Si\sb{1-x}C\sb{x}$:H) thin films by reactive magnetron sputtering. Complimentary information about the film microstructure is obtained from …
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Electronic properties of my-Si : H layers investigated with Hall measurements
… of the electronic properties of thin films of microcrystalline silicon. Temperature-dependent determination of the mobility and carrier concentration of the electrons in layers with different doping levels and crystallinity. Proposal of a model of potential barries with a height distribution in …
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Anti-reflection zinc oxide nanocones for higher efficiency thin-film silicon solar cells
Thin film silicon solar cells, which are commonly made from microcrystalline silicon ([mu]c-Si) or amorphous silicon (a-Si), have been considered inexpensive alternatives to thick polycrystalline silicon (polysilicon) solar cells. However, the low solar efficiency of these thin film cells has …
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Characterisation of thin-film semiconductors for device application
Microcrystalline silicon films prepared over a range of deposition conditions have been investigated using dark- and photo-conductivity measurements, constant photocurrent method and transient photoconductivity. The dark conductivity was measured as a function of temperature; the photoconductivity …
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Depositing highly crystalline thin film silicon for photovoltaic solar cells utilizing metal surface wave plasmas
… to create low damage, high speed deposited silicon thin films for solar photovoltaics. Studies characterizing thin films have been performed in the past, but very few utilizing the MSWP. Due to the high electron densities and low electron temperatures characteristic of MSWPs, it is shown …
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Performance of Acid-Gas Anaerobic Digestion for Minimization of Siloxane and Hydrogen Sulfide Produced in Biogas for Energy Recovery
Organosilicon compounds, which are heavily utilized in personal care products, are typically present, sometimes in high concentrations in the influent of wastewater treatment facilities. During anaerobic sludge digestion, these compounds volatilize and enter the methane gas recovery stream. As the …
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Numerical Analysis and Optimal Design of Efficient Thin-Film Solar Cells with Novel Buffer Layers
The mass production of silicon thin-film solar cells, typically deposited on cost effective ceramic substrates, depends on enhancing the performance and lowering the cost. Among other active layers inside the cell, performance enhancement depends on a layer that separate the light absorbing layers …
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Lichtstreuende Oberflächen, Schichten und Schichtsysteme zur Verbesserung der Lichteinkopplung in Silizium-Dünnschichtsolarzellen
… solar cells based on amorphous (a-Si:H) and microcrystalline (µc-Si:H) silicon. The study focuses on the optimization of the aluminum-doped zinc oxide (ZnO:Al) front contact, which has to combine low series resistance and high transparency. The two essential premises (high transmission and …
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Plasmon supported defect absorption in amorphous silicon thin film solar cells and devices
… on the absorption of hydrogenated amorphous silicon (a-Si:H) thin film solar cell devices is investigated. Small metal nanostructures with lateral dimensions well below 100 nm accompany strong absorption and large electric field amplitudes in their vicinity. This is caused by the localized …
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STUDY ON THE PERFORMANCE OPTIMIZATION OF THIN FILM SILICON AND BIFACIAL PHOTOVOLTAIC MODULES THROUGH OUTDOOR VARIABLES
… been the performance optimization of thin film Silicon and bifacial photovoltaic (PV) devices, by means of an in-depth study of their behavior by varying the outdoor variables affecting their electrical performance. The first part of such work has been focused on the study of performance …