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 23 for “"p-type silicon"”.
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Tunneling spectroscopy in p-type silicon
Tunneling in boron doped p-type silicon metal-semiconductor and metal-insulator-semiconductor tunnel junctions has been studied at low temperatures by measuring the derivatives, di/dV and d2i/dV2, of the current-voltage characteristics as functions of applied bias voltage V. The junctions were …
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An ultrasonic study of point defects in electron-irradiated P-type silicon
… on electron-irradiated Bdoped and Al-doped silicon. Neutral substitutional boron is detected before irradiation, as expected from previous ultrasonic studies on unirradiated silicon. This defect produces both resonance and relaxation. Similar effects are observed for substitutional aluminum. …
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Characterization of p-type silicon semiconductor detectors for use in in vivo dosimetry
The response of a p-type diode detector for use in patient dose monitoring in photon and electron fields was evaluated for a number of commonly-encountered clinical parameters. Effects of energy, field size, source-to-surface distance, presence of beam modifiers, beam orientation, and temperature …
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Electrochemical Transformation of Alkanes, Carbon Dioxide and Protons at Iron-Porphyrins and Iron-Sulfur Clusters
… at both vitreous carbon and illuminated p-type silicon surfaces, with reasonable current efficiencies. At illuminated p-type silicon photovoltages of ca 500mV are obtained. 7 Chapter 4 describes the electrochemical and photoelectrochemical reduction of proton to H2 using [Fe4S4 (SPh)4]2- as …
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Semi-conductor Core Optical Fibers and Fabrication Dependence of the Grain Structure
… of fabrication and characterization of 4 fiber types, an experiment on controlling the grain length in the core and a simple model of the heat transfer during fabrication. Fibers were first made with a silicon core, followed by a phosphorous doped n-type silicon core, then a boron doped p-type …
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Koh etching of silicon
… a series of comparative etching experiments on silicon wafers have been carried out using potassium hydroxide (KOH) for different experimental etching conditions for concentration, temperature and time on (100) orientation p-type silicon wafers. Besides the basic etching conditions, the position …
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Optically Powered Logic Transistor
… in the semiconductor and device geometries. Prototypes were fabricated on p-type silicon wafers using CMOS fabrication processes including oxide growth, photolithography, precise plasma or chemical wet etching, diffusion processes, and thin film evaporation. Electrical measurements were done by …
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Production and characterisation of nanoparticulate silicon photovoltaic devices
… electronically functional nanoparticulate silicon solar cells, by using low cost screen printing on paper substrates, has been developed. The semiconductor materials used consisted of n- and p-type silicon nanoparticles produced by means of high energy mechanical milling, as well as …
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Fabrication and Characterization of Small Scale Photo-Electro-Chemical Solar Cells
… solar cell.</p> <p>The cell consists of a p-type silicon cathode with an etched micro-cavity that houses the zinc chloride electrolyte solution, and the cavity is covered by a sheet of zinc acting as the anode. The cell operates using a semiconductor-electrolyte junction instead of the p-n …
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Grafeno ant skandžio oksido fotolitografija /
… heteroepitaxy of group III nitrides on sapphire, silicon carbide, oxides of rare earth elements and homoepitaxy on bulk GaN substrates is carried out. The goal of the project is to obtain a metal-dielectric-semiconductor junction by replacing the metal with graphene due to its much better charge …
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Design, Fabrication, Testing of CNT Based ISFET and Characterization of Nano/Bio Materials Using AFM
… the fabrication of the CNT-ISFET structure on p-type silicon wafers. In addition, Atomic Force Microscopy (AFM) based surface nanomachining is investigated and used for creating nanochannels on silicon surfaces. Since AFM based nanomanipulation and nanomachining is highly controllable, …
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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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Assessing materials quality for high efficiency electricity generation
… losses drastically reduce the efficiency of silicon solar cells. In an age where we need sustainable energy production more than ever, silicon is the best material to target due to its high stake in the sustainable energy market. An organic-inorganic solar cell hybrid of tetracene-covered …
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Characteristics of nanocomposites and semiconductor heterostructure wafers using THz spectroscopy
… nanoclusters and Si_{1-x}Ge_x HFO_2, SiO_2 on p-type Si wafers. For the nanoscale composite materials, Visible Pump/THz Probe spectroscopy measurements were performed after observing that the samples were not sensitive to the THz radiation alone. The results suggest that the photoexcited …
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Generating Small Molecule Fuels: (Photo)Electrochemical Catalysts
… catalysts used in this work. Semiconducting silicon electrodes have been explored as a means of coupling these hydrogen evolving and nitrogen fixation systems to the harvesting of visible light – solar fuels and solar synthesis respectively. Chapter 1 gives a general overview of the world …
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Hall effect in printed Nanoparticulate Silicon Networks
Silicon nanoparticles for the application of printed electronics were successfully synthesised and characterised. High energy milling has been proven to yield uncontaminated powder of median particle size 150 nm satisfying a lognormal distribution. Single crystalline P- and N-type silicon wafers, …
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Growth of Semiconductor Thin Films by Pulsed Laser Deposition
… films of zinc oxide and tin dioxide on (111) p-type silicon wafers within a versatile high vacuum laser deposition system. This pulsed laser deposition system was self-designed and self-built. Parameters such as pressure, target temperature, and distance from the target to the substrate can be …
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Hall Potential Mapping of Conducting Ferroelectric Domain Walls
… not been performed with neither local carrier types, mobilities or densities explicitly determined for any domain wall system. This thesis details the development of a scanning probe microscopy technique that facilitates spatial mapping of the Hall effect within conducting domain walls. The …
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Defects and charge-carrier lifetime in early-stage photovoltaic materials : relating experiment to theory
… more iron in the feedstock than comparable p-type silicon solar cells. In addition, improved methods for extracting lifetime from solar cell devices are explored. Quantum efficiency measurements are performed and modeled on tin monosulfide solar cells to verify that very short lifetimes …
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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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