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 15 of 15 for “"silicon nanostructures"”.
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Effect Of Surfaces On Strength Evolution Of Silicon Nanostructures
… oxidation and strength changes in single crystal silicon nanostructures but provided no clues as to the mechanisms leading to this relationship. Through a mix of atomic force microscope based fracture strength experiments, molecular dynamics modeling, and comparisons to past experiments we have …
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Computational Modeling of Geometry Dependent Phonon Transport in Silicon Nanostructures
… that thermal properties of semiconductor nanostructures depend on nanostructure boundary geometry. Phonons are quantized mechanical vibrations that are the dominant carrier of heat in semiconductor materials and their aggregate behavior determine a nanostructure's thermal performance. …
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Spectroscopic surface scattering of confined acoustic phonons in silicon nanostructures
… is a fundamental aspect of phonon transport in nanostructures. It directly impacts engineering problems such as heat conduction in nanostructures and dissipation in nanomechanical resonators. At room temperature, the available guidance from theory is limited to fully diffuse transport under the …
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Direct measure of band edge optical absorption of silicon nanostructures using photothermal deflection spectroscopy
Quantum confined silicon nanoparticles (Si-NPs) are a promising material for optoelectronic applications. In this thesis, I studied the band edge optical absorption of free standing Si-NPs and Si-NPs in an amorphous silicon matrix, a composite material also known as nano-crystalline silicon …
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Hierarchical and size dependent mechanical properties of silica and silicon nanostructures inspired by diatom algae
Biology implements fundamental principles that allow for attractive mechanical properties, as observed in biomineralized structures. For example, diatom algae contain nanoporous hierarchical silicified shells that provide mechanical defense from predators and virus penetration. These shells …
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Nonlithographic manufacturing of 1-D silicon nanostructures with tunable surface morphology via thermal dewetting and metal-assisted chemical etching
… approach to generate wafer-scale single crystal silicon nanowires (SiNWs) with controlled side-wall profile and surface morphology. The approach begins with silver (Ag) thin-film thermal dewetting, gold (Au) deposition and lift-off to generate a large-scale Au mesh on Si substrates. Followed by …
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Computational Analysis of Silicon Nanoelectromechanical Systems
… (QC) approach for multiscale analysis of silicon nanostructures at finite temperature. Three models, namely the real space quasiharmonic (QHM) model, the local quasiharmonic (LQHM) model, and the reciprocal space quasiharmonic (QHMK) model are investigated. Within this framework, we …
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Fabrication of three-dimensional nanostructures for thermal study
… three-dimensional structures and epitaxial nanostructures are discussed. Using self-assembly of colloidal silica particles as a template, various dielectrics of interest were filled to create nanostructured dielectric materials. First, sub-100 nanometer silica nanoparticles were synthesized …
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Stability Investigation of Silicon Nanowire Solar Cells
… structure in which the semiconductor is made of Silicon nanostructures is used in this work to study and investigate the Silicon nanostructure's stability. The back contact and oxidation layer optimisation process have similarly been provided for investigation purposes. The RF plasma-enhanced …
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Computational analysis of thermodynamic and mechanical properties of nano-materials
… (QC) approach for multi-scale analysis of silicon nanostructures at finite temperature. The quasi-continuum method employs the classical continuum mechanics framework and the constitutive relations are extracted from the atomistic description. For finite temperature solid systems under …
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Biologically-templated metal oxide and metal nanostructures for photovoltaic applications
… We applied the process to the synthesis of silicon nanostructures for use as semiconductors or photoactive materials. As starting materials, we obtained diatomaceous earth, a natural source of biotemplated silica, and we also mineralized M13 bacteriophages with silica to produce porous …
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Fabrication of high aspect ratio silicon nanostructure arrays by metal-assisted etching
… the mechanisms involved in the fabrication of silicon nanostructures using metal-assisted etching. We developed a method utilizing metal-assisted etching in conjunction with block copolymer lithography to create ordered and densely-packed arrays of high-aspect-ratio single-crystal silicon …
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Co-Assembly Of Nanostructured Hybrid Materials For Energy Applications
… porous crystalline semiconductor and organic nanostructures. In a first example, a 308 nm pulsed XeCl excimer laser was used to induce transient melting of amorphous silicon in colloidal self-assembly-directed silica templates, which subsequently solidified into crystalline silicon …
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Synthesis of silicon nanocrystal memories by sputter deposition
In Silizium-Nanokristall-Speichern werden im Gate-Oxid eines Feldeffekttransistors eingebettete Silizium Nanokristalle genutzt, um Elektronen lokal zu speichern. Die gespeicherte Ladung bestimmt dann den Zustand der Speicherzelle. Ein wichtiger Aspekt in der Technologie dieser Speicher ist die …
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Plasma Enhanced Layer-by-layer Deposition and Nano-crystallization of Si:H films
Nano-crystalline Si (nc-Si) is a promising candidate for photovoltaic applications due to its better stability compared to amorphous Si, and relatively easy to manufacture at low cost, by plasma enhanced chemical vapor deposition (PECVD), compared to single crystal Si. The crystalline volume …