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 77 for “"Optical and Electrical Properties"”.
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Silicon-germanium nanowire heterojunctions: Optical and electrical properties
… objects with unique physical properties and strong potential in nanophotonics, nanoelectronics, biosensing, and solar cell devices. The next challenge in the development of nanowire functional structures is the nanowire axial heterojunctions, especially lattice mismatched …
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Optical and electrical properties of thin bismuth deposits
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1960.
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Optical and Electrical Properties of Novel Quantum Dot Lasers and Amplifiers
… transverse-electric (TE) gain narrowing and transverse-magnetic (TM) gain pinning is measured below threshold. A polarization-dependent photon-mediated carrier redistribution with the coupled rate equation model is proposed to explain this unique optical gain evolution behavior. To …
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Experimental investigation of optical and electrical properties of various explosive fireballs
… Currently, much interest surrounds how properties vary near the shock wave front. Upon detonation, the shock wave propagates outward with detonation products traveling closely behind. Much has been studied regarding the pressure from the incident shock wave; however, little is known …
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Effects of crystal growth process parameters on the microstructural optical and electrical properties of CdTe and CdMnTe
… of Technology, Dept. of Materials Science and Engineering, 1988.
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Optical and electrical properties of narrow gap germanium-tin alloys with high tin contents for middle and far infrared applications
… attention because of the interesting electronic properties they possess. The offer a potential route to a direct bandgap group IV semiconductor that is isoelectronic with silicon and can be fully integrated into current silicon manufacturing processes. Despite the active research of GeSn some of …
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Transparent Conductors based on Ag Nanolayer embedded in Semiconductor Oxides
Aim of this work is the fabrication, processing and characterization of ultrathin TCO/Ag/TCO transparent electrodes. The study, is also focused on the optimization of structural, optical and electrical properties for several applications. The thesis is organized as follows: Chapter 1: it introduces …
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MAX-phase Partial Optical Properties
The optical and electrical properties of MAX-phase materials have been thoroughly studied in the past. We present here a new technique to determine and study the partial contributions to the optical properties. Following the same methodology as the decomposition of the density of states to the …
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Design, Fabrication, and Characterization of Terahertz Quantum Cascade Lasers
… study of the role of the substrate on the optical and electrical properties. We find that the effect of the substrate thickness on the laser performance is dependent on other waveguide parameters. In particular, if the plasma layer is thick enough, the role of the substrate should be …
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Growth and characterization of mid-infrared phosphide-based semiconductor diode lasers
… is the most prominent pseudomorphic epitaxy candidate for this application. However, phosphide-based material not only has the potential to reach this wavelength utilizing a strained active region but also takes the advantage of sophisticated material study from telecommunication technology. …
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Understanding the oxidation and reduction process in transparent conducting oxides
… devices such as LEDs, thin film solar cells, and smart windows through their ability to efficiently transport both photons and electrons. Simultaneous requirements of a wide band gap, high free carrier concentration, and high electron mobility limits the selection of available transparent …
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Formation rates of silver metal danoprisms as a function of halide concentration
… allows for the optimization of a nanoparticle’s optical and electrical properties. One form of control is the addition of defects during nanocrystal formation. Nanoprisms are highly responsive to this form of control through halide concentration. However, the rate at which this control occurs has …
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Fabrication and characterization of AgBiS2 and BiSI light harvesting materials for thin film solar cell application
Recently, AgBiS2 and BiSI are both known as promising absorbing candidates for thin film solar cell application. Both compounds contain earth abundant and non-toxic elements, facilitating their low cost and large-scale production. In addition, due to the tuneable optical bandgaps by composition …
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Synthesis and surface chemistry of zinc oxide nanowires for chemical sensor applications
… work in this dissertation comprises of synthesis and functionalization of high quality ZnO nanowires for highly sensitive and selective p-nitrophenol vapor sensor. High-quality ZnO nanowires were synthesized through a vapor-liquid-solid process in a customized chemical vapor deposition furnace. …
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Lattice Engineering of III-Nitride Heterostructures and Their Applications
… materials have recently become a promising candidate for superior applications over the current technologies. However, certain issues such as lack of native substrates, and high defect density have to be overcome for further development of III-Nitride technology. This work presents research …
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A study of electron traps in vapor phase epitaxial gallium arsenide grown in the presence of oxygen
… which includes an accurate treatment of large and inhomogeneous defect densities, and which allows a precise determination of deep level concentrations and activation energies. The design and construction of the automated measurement apparatus are described, and the computer programs for the …
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Bimetallic Nanoporous Sponges
… is a promising nanomaterial with unique physical properties distinct from its bulk counterpart, including high surface area, enhanced chemical sensing and tuneable optical and electrical properties. This thesis explores the fabrication and characterisation of np-S thin films and bulk structures …
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Embedded Nanosensors for defect identification using flexible, optically transparent, deformation responsive wrinkled Single Walled Carbon Nanotube meshes
… natural gas, nuclear plant cooling tanks and so forth are made of concrete. In vivo detection of the onset of cracks and voids in these concrete structures have many barriers and neglecting those could lead to failure of structures causing loss of properties and damage to lives. Embedded …
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Micro fluidic cytometry for analysis of marine microorganisms
Knowledge of the distribution and concentration of phytoplankton (microscopic algae that live in the oceans) is important, as this reflects and may modify environmentally important events such as pollution, climate change and carbon dioxide sequestration. Optical based flow cytometry has proved to …
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