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 17 of 17 for “"zinc blende"”.
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Harmonic and Supercontinuum Generation in Zinc-Blende Materials
… and broad transparency window in the MIR, zinc-blende materials in their polycrystalline form are uniquely suitable for extremely broadband harmonic and supercontinuum generation. This dissertation reports on the development of numerical methods for simulating light-matter interactions in …
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Lattice dynamics of zinc blende crystals with point impurities.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1972
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Electronic Structures of Cadmium Sulfide and Zinc Oxide
… is found in the calculations of the zinc-blende form. Energy band calculations are performed on zinc oxide to determine its electronic structure, and the computed bands agree with optical measurements of the valence bands.
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Electronic structure and optical properties of sb-based self-assembled quantum dots for the mid-infrared range
… that the strain-modified band profile of the zinc-blende III-V compound semiconductor SAQDs is not very sensitive to the details of the dot shape and the major governing parameter of the geometry is the aspect ratio of the dot. The modelling results also reveal that there are no appropriate …
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Experimental and Numerical Investigations into Terahertz Time-Domain Spectroscopy
… materials. Our samples of interest are the III-V zinc-blende semiconductors GaP and ZnTe which are nonlinear media popular for their advantageous dispersive and absorptive properties in the terahertz range. Therefore, the thesis culminates in the demonstration of a material parameter extraction …
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A backscattering ion channeling study of the lattice site location of the constituents of two systems
… phase transition in the alloy from the zinc blende structure to a diamond structure. In the second system the extent of antimony segregation to the [111] silicon - silicon dioxide interface was first determined. Channeling scans were made through the [111], [110] and [121] directions of …
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Investigating the unique occurrence of polytypism and the role of available shell precursors in the growth of giant shell quantum dots
… disparate (W, wurtzite and ZB, zinc blende) CdSe cores under identical synthetic conditions. My work revealed that while shell growth transitioned to W type growth in both cases, occurrence of unique W-ZB mixed crystallinity (polytypism) was significant and might result in the …
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Synthesis, Characterisation and Functionalisation of CdSe Quantum Dots
… of the crystallite phases obtained, from cubic zinc-blende to hexagonal wurtzite and back again to the cubic phase as a function of reaction time. The nature of this phase shift is believed to be due to the rapid growth along the {111} crystallite facets, with the facial facets then …
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Exploring condensed phases in engineered semiconducting nanocrystals
… novel wurtzite phase, differ from their natural zinc-blende counterparts. The latter is a semi-metal, whereas the newer phase obtained from cation exchange is found to have an inverted band structure along with a finite band-gap, making it a potential 3D topological insulator. In Chapter 5, I …
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Core-Level Photoemission Investigations of the Cadmium-Telluride(100) and Indium-Antimony(100) Surface and Interfacial Structures
… used to analyze the clean (100) surfaces of the zinc-blende semiconductor materials CdTe and InSb. Several interfacial systems involving the surfaces of these materials were also studied, including the CdTe(100)-Ag interface, the CdTe(100)-Sb system, and the InSb(100)-Sn interface. High-energy …
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Core-level photoemission investigations of the CDTE(100) and INSB(100) surface and interfacial structures
… used to analyze the clean (100) surfaces of the zinc-blende semiconductor materials CdTe and InSb. Several interfacial systems involving the surfaces of these materials were also studied, including the CdTe(lOO)-Ag interface, the CdTe(lOO)-Sb system, and the InSb(lOO)-Sn interface. High-energy …
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Frustration from Frustration: Field Tuning, Vison Crystallisation, and Disorder in Quantum Spin Ice
… phase, which may be thought of as a zinc blende packing of Dirac monopoles (visons) in the emergent gauge theory. This theory’s phase diagram exhibits ‘flux frustration’, a peculiar phenomenon in which not just the magnetic moments, but also the fluxes of the emergent gauge field …
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Lattice mismatched compound semiconductors and devices on silicon
… the two face-centered-cubic sublattices of III-V zinc-blende structures. By using a 60 offcut substrate (Ge on insulator) which favors a double-step surface reconstruction upon annealing, antiphase disorders were suppressed and single-domain GaAs on Si was demonstrated. The lattice was then graded …
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Growth of narrow band gap semiconductor nanowires on silicon and graphitic substrates by droplet epitaxy
… InAs NWs show a mixture of Wurtzite (WZ) and Zinc-Blende (ZB) phases, a crystal phase evolution from a highly polytypic InAs to a quasi-pure WZ InAsSb NWs (2-4% Sb content) and a quasi-pure ZB InAsSb NWs crystals (~10% Sb content) is demonstrated in addition to a significant reduction in the …
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Cobalt-based Heusler compounds in magnetic tunnel junctions
… as Fe3O4 and CrO2, perovskites (e.g. LaSrMnO3), zinc-blende-type CrAs and Heusler compounds. In particular, Co-based Heusler compounds are promising materials for spintronic applications due to the required high Curie temperatures T_C. Here a Heusler compound is given by the composition X2YZ and …
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First-Principles Studies of Electronic, Optical and Defect Properties of Photovoltaic Materials
… PV cells, e.g., based on metal chalcogenide zinc-blende-type materials (Cu(In,Ga)(S,Se)2 (CIGSSe), CdTe) suffer from problems like relying on elements that are either toxic or rare in the earth’s crust, a recent alternative candidate based on kesterite Cu2ZnSn(S,Se)4 (CZTS) peaked at …