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 641 for “"bandgap"”.
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Bandgap current source
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Multilayer composite photonic bandgap fibers
… fabrication of multilayer composite photonic bandgap fibers. The pertinent background in electromagnetic theory of multilayer dielectric mirrors and optical fibers is surveyed. Materials properties constraints are outlined, with emphasis on those constraints related to processing strategy and …
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Graphene Heterostructures with Wide Bandgap Semiconductors
… microelettronica è legata all'assenza di un bandgap, che si ripercuote in uno scarso rapporto Ion/Ioff se utilizzato come canale di dispositivi di tipo MOSFET. Allo scopo di superare queste limitazioni, nuove concezioni di dispositivo basate su eterostrutture di Gr su semiconduttori sono …
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Investigating packaging effects on bandgap references
… investigates packaging effects on precision bandgap voltage references used in LTC switching regulators. Packaging stress causes a mean offset and room temperature distribution widening of the bandgap reference output voltage, as well as inconsistent temperature characteristics. Bandgap …
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High power wide bandgap cascode switching circuits
Emerging wide bandgap (WBG) power transistors are capable of improving the efficiency of mains voltage power electronic circuits. Several commercial WBG transistors are now available, but all exhibit undesirable gate drive characteristics. The cascode circuit has been suggested as a solution to …
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Electrical characterisation of defects in wide bandgap semiconductors.
… characterisation of two different wide bandgap semiconducting materials (polycrystalline diamond and GaN) which have both recently attracted a great deal of attention because of their potential applications in the fields of power electronics and optoelectronics. Raman spectroscopy, I-V …
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Acoustic bandgap sensors for hot-spot damage monitoring
… acoustic response of a polymer based acoustic bandgap (ABG) material to identify and quantify damage in material substrates. Acoustic bandgap (ABG) sensors are the mechanical analogues of semi-conductors by which a periodic array of differing acoustic impedances causes an acoustic bandgap. This …
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Optomechanical Spin-Photon Interface in Wide-Bandgap Materials
The quantum internet—an interconnected network that can distribute and store quantum states—is required to develop the next generation of quantum technologies, such as unconditional secure communication, enhanced metrology, and distributed quantum computing. A key challenge for the distributed …
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The fabrication of photonic bandgap bridge resonator structures
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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High-throughput Bandgap Mapping for Perovskite-inspired Materials
… a novel high-throughput technique to map local bandgaps with pixel-level resolution. This characterization technique utilizes spatially-resolved reflectance spectra and automated data analysis. I collected approximately a million optical bandgap measurements from the compositional space of …
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Investigation of air-bridge-waveguide photonic bandgap structures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Carrier transport properties measurements in wide bandgap materials
… carrier lifetime, and resistivity in two wide bandgap materials, GaN and diamond. A combination of two methods was used to obtain these transport properties. The two were optical beam induced current (OBIC) and electron beam induced current (EBIC) time of flight transient measurements. These …
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Atom probe tomography study of wide bandgap semiconductor materials
… utilize APT as a characterization tool for wide bandgap semiconductors, specifically zinc oxide (ZnO) nanowires and GaN-based epitaxial sample. Wide bandgap semiconductor materials have attracted considerable attention in recent years because of the practical applications such as green and blue …
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Sol-gel synthesis of one-dimensional photonic bandgap structures
A series of one-dimensional photonic bandgap devices were fabricated using SiO2 and TiO2 films deposited from solution by the sol-gel method. A dielectric mirror, or broadband interference filter, was fabricated by alternating quarter-wave optical thickness layers of the two films on a silicon …
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Hard Switched Robustness of Wide Bandgap Power Semiconductor Devices
… new devices have been commercialized using wide bandgap (WBG) semiconductors including silicon carbide (SiC) and gallium nitride (GaN). These new devices promise enhanced capabilities (e.g., higher switching speed, smaller die size, lower junction capacitances, and higher thermal conductance) …
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Optoelectronic devices based on graded bandgap structures utilising electroplated semiconductors
… is to develop low-cost multi-junction graded bandgap solar cells using electroplated semiconductors. The semiconductor materials explored in this research are CdSe, ZnTe, CdS, CdMnTe and CdTe thin films. These layers were characterised for their structural, compositional, morphological, …
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Directed Synthesis and Doping of Wide Bandgap Semiconducting Oxide Nanocrystals
Wide bandgap semiconducting oxide nanocrystals are a useful class of materials with high stability and numerous useful properties. In the field of catalysis, high surface area oxides are commonly used as catalytic supports and have been found to be photocatalytically active for the production of …
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