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 21 for “"Crystal Defects"”.
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Assembly and detection of viruses and biological molecules on inorganic surfaces
… project entitled, Biomolecular Recognition of Crystal Defects extended the phage display technique to the detection of crystal defects. The system used is based on the M13 bacteriophage with 7-residue constrained random sequence on protein III. After considerable experimentation a procedure …
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Growth and application of planar III-V semiconductor nanowires grown with MOCVD
… lasers, and field-effect transistors. However, crystal defects are widely reported for III-V nanowires when grown in the common out-of-plane <111>B direction. Furthermore, commercialization of nanowires has been limited by the difficulty of assembling nanowires with predetermined position and …
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The Effects of Annealing URu2Si2 on the Resistivity and Meissner Effect
… are still not clear to researchers. Perfect crystals do not exist. Different kinds of crystal defects can have considerable effects on the crystalline properties. Some of these defects can be eliminated, and hence the crystalline quality improved, by annealing. Previous publications showed …
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Charge-Density-Wave Transport in Quasi - One-Dimensional Conductors
… the dc I-V characteristic are observed. However, crystal defects other than impurities can significantly degrade the measured properties, and play a determining role in the generation of broad-bandwidth noise.
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Dislocation engineering in InAlGaAs/SiGe alloy systems for heteroepitaxial integration
… introduces challenges related to detrimental crystal defects like dislocations that are created in the process and require buffer layers to accommodate such defects and minimize their impact on device performance. One buffer layer scheme that is receiving widespread adoption involves the …
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Mechanism and Applications of large and persistent photoconductivity in cadmium sulfide
… trapping of photo-generated minority carriers at crystal defects. Theory has suggested that anion vacancies in II-VI semiconductors are responsible for LPPC due to negative-U behavior, whereby two minority carriers become kinetically trapped by lattice relaxation following photo-excitation. By …
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Theory and fabrication of colloidal-crystal Bragg filters
… material parameters, is developed for colloidal-crystal Bragg filters. The coupling constant, for coupled-wave equations, is derived to produce filter spectra. The spectra are modified by convolving with a Gaussian function to represent crystal defects. Scattering losses are calculated to …
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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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4H silicon carbide particle detectors: study of the defects induced by high energy neutron irradiation
… used for their realization, is caused by lattice defects, like creation of point-like defect, dopant deactivation and dead layer formation and that a crucial aspect for the understanding of the defect kinetics at a microscopic level is the correct identification of the crystal defects in terms of …
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Characterization of silicon photovoltaic wafers using polarized infrared imaging
… solar cells. Thermal process can introduce crystal defects and residual stress in a PV wafer, which can impact the electrical performance and mechanical reliability of a finished solar cell. This research presents characterization methods for mono-crystal and multi-crystal silicon PV wafers, …
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Off-lattice kinetic Monte Carlo methods and the Fe-H system: saddle-points, symmetry, and coroutines
… of modelling the complex interactions between crystal defects and hydrogen (H) in iron (Fe), into the timescales required to study the mechanisms of hydrogen embrittlement (HE). The underlying mechanisms of HE act on the atomic scale but manifest at the macro scale (particularly in the time …
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Sources of noise in niobium-based superconducting quantum circuits
… and reduced. Two-level fluctuators due to defects in the materials are thought to cause changes to the Josephson critical current or the flux through the superconducting loop of a flux qubit, which leads to decoherence in the qubit. Alternatively, defects in the crystal lattice give rise to …
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Interband quantum tunneling at the band-edges in III-V semiconductor heterojunctions for low-power logic and detectors
… depends on various factors including interfacial crystal defects, inhomogeneity, temperature, and band alignment. Using type-III band alignment epitaxially grown InAs/GaSb heterojunctions, as well as both type-II and type-III band alignment InGaAs/GaAsSb heterojunctions, it is identified that …
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Electron tomography of defects
Tomography of crystal defects in the electron microscope was rst attempted in 2005 by the author and colleagues. This thesis further develops the technique, using a variety of samples and methods. Use of a more optimised, commercial tomographic reconstruction program on the original GaN weakbeam …
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Effect Of Annealing On Copper Thin Films:the Classical Size Effect And Agglomeration
… phonons, surfaces, grain boundaries, and other crystal defects. Managing the size effect in a practical and manufacturing way is of major concern to the microelectronics industry. Since each of the processes (phonon, surface and grain boundary scattering) adds to the resistivity and are …
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Ultrahigh resolution surface phononics
… results from the literature. It is shown that crystal anharmonicity is related to phonon-phonon interaction. It is also proved that phonon-phonon interaction will make phonon energy and phonon linewidth change linearly as a function of temperature. Both trends are demonstrated using HeSE phonon …
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Plastic Deformation in Complex Crystal Structures
Many materials with complex crystal structures have attractive properties, including high specific strength, good creep resistance, oxidation resistance, often through high silicon or aluminium content. This makes them of interest for high temperature structural applications, but the use of many …
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Mechanical Design of Selected Natural Ceramic Cellular Solids
… to the discovery of a unique dual-scale single-crystalline porous lattice structure (porosity: 50 vol%, constituent material: 99 wt% calcite) in the ossicles of P. nodosus. At the atomic level, the ossicle is composed of single-crystal biogenic calcite. At the lattice level, the ossicle's …
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Understanding the Structure-property Relationships of Solid-state Additively Manufactured Stainless-steel Coatings
… the effect of CS resulted in a refinement of crystallinity due to the localized adiabatic heating and stresses of the severely deformed particles. These effects translated to the reduced friction and wear observed from the CS deposit. Electrochemical tests also revealed that the CS sample had …
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The study of organic crystals by atomic force microscopy
Organic crystals are found in everyday goods such as foods, drugs, dyes, and agricultural products. To better understand the solid-state behaviour of organic crystals, the study of their surfaces is crucial, as several reactions occur at the interface between the crystal surface and its immediate …
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