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 18 of 18 for “"nanowire array"”.
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Three-dimensional field-effect transistors with top-down and bottom-up nanowire-array channels
… transistor topologies using three-dimensional nanowire (NW)-array channels formed by both bottom-up and top-down synthesis. The bottom-up NW research centers on the Au-catalyzed planar GaAs NW assembly discovered at the University of Illinois Urbana-Champaign (UIUC). The top-down NW research …
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Hydrothermal synthesis of zinc oxide nanowire arrays for photovoltaic applications
Zinc oxide (ZnO) nanowires with excellent crystal quality can be grown vertically aligned from a substrate using hydrothermal synthesis, a low-cost, scalable process that is compatible with many semiconductor processing techniques. However, precise control over nanowire array dimensions such as …
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II-VI Core-Shell Nanowires: Synthesis, Characterizations and Photovoltaic Applications
<p>The emergence of semiconducting nanowires as the new building blocks for photovoltaic (PV) devices has drawn considerable attention because of the great potential of achieving high efficiency and low cost. In special, nanowires with a coaxial structure, namely, core-shell structures have …
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Highly Sensitive and Selective Gas Sensors Based on Vertically Aligned Metal Oxide Nanowire Arrays
… systems that consist of olfactory receptor arrays with large surface area and massively-diversified chemical reactivity, three dimensional (3D) metal oxide nanowire arrays were used as the active materials for gas detection. Metal oxide nanowire arrays share similar 3D structures as the …
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Wide band-gap nanowires for light emitting diodes
Wide band-gap nanowires composed of GaN and ZnO are promising materials for unique designs and potential efficiency improvement of light emitting diodes (LEDs) for solid state lighting. The large surface-to-volume ratio of nanowires provides facile strain-relaxation such that nanowires can be grown …
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Nanostructured photovoltaics : improving device efficiency and measuring carrier transport
… architecture that combines a zinc oxide (ZnO) nanowire ordered bulk heterojunction (OBHJ) architecture with band alignment engineering of the PbS QD film to enhance charge extraction is demonstrated. This approach results in PV devices with photocurrent density greater than 30 mA/cm2, which …
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Synthesis and surface chemistry of zinc oxide nanowires for chemical sensor applications
… 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. Scanning electron microscopy, transmission …
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Volumetric creation of ultra-high-energy-density plasma by irradiation of ordered nanowire arrays
… in the fabrication of vertically aligned nanowire array targets, in coordination with ultra-high-contrast femtosecond laser pulses focused to relativistic intensity, have opened the door to creating UHED matter using compact laser facilities with laser pulses of ~ 0.6 J. These high aspect …
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Defect engineering of cuprous oxide thin-films for photovoltaic applications
… I propose a spatially controlled vertical ZnO nanowire array to overcome the short minority carrier diffusion length in Cu₂O. A scalable fabrication process is developed using colloidal lithography and hydrothermal growth of ZnO nanowires. Optical simulations are also conducted to investigate …
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Nanowire sharpening : application to field ionization
Nanowires show potential for a wide range of fields, from developing next generation solar cells, to detecting viruses, to field ionizing gasses. Their uses in such disparate fields are due to the extreme flexibility in which nanowires can be manufactured and customized to order. The heart of a …
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Fabrication and photonics properties of III-V semiconductor nanowire structures
<p>III-V semiconductor nanowires (NWs) have shown great potential to be building blocks for optical, optoelectronic, and electronic devices due to their special transverse confinement of electrons and photons along the nanowire axis. In addition, semiconductor nanowires with subwavelength …
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Fabrication of high aspect ratio silicon nanostructure arrays by metal-assisted etching
… lithography to create ordered and densely-packed arrays of high-aspect-ratio single-crystal silicon nanowires with uniform crystallographic orientations. Nanowires with sub-20 nm diameters were created as either continuous carpets or as carpets within trenches. Wires with aspect ratios up to 220 …
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Metal-assisted chemical etching of semiconductor nanostructures for electronic applications
… highly ordered crystalline silicon (c-Si) via array is demonstrated by MacEtch. The systematic study of etch rate as functions of catalyst diameter, pitch, and spacing experimentally demonstrates the simultaneous influence of carrier generation and mass transport in MacEtch. Next, sub-micron …
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Current Induced Magnetisation Dynamics in Ferromagnetic Nanowires
Ferromagnetic nanowires are functional and integral constituents in a variety of advanced technologies, including tuneable microwave devices, magnetic storage, spintronics, electromagnetic wave absorbers, noise suppressors, and biomedical applications. Their significance and popularity stem from …
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Fabrication of capacitors based on silicon nanowire arrays generated by metal-assisted wet chemical etching
… assisted wet chemical etching for fabrication of arrays of silicon nanowires, and then use this understanding to build nanowire array on-chip capacitors in silicon substrates, in order to eliminate additional packaging and enable local and efficient energy delivery. Two types of capacitors were …
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The Effect Of Stationary UV Excitation On The Optical Behavior Of Electrochemically Self-Assembled Semiconductor Nanowires
… response of the semiconductor quantum wire array when excited by stationary UV light. The array is synthesized by selectively electro-depositing the semiconductor material in electrochemically self-assembled porous alumina templates. Our studies are based on the optical behavioral changes in …
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Orientation Controllable Epitaxial Vapor-Liquid-Solid Semiconductor Nanowire Synthesis on Silicon Substrate
<p>Semiconductor nanowires synthesized via the vapor-liquid-solid (VLS) mechanism have attracted extensive research interest in recent years owing to their unique structure as a promising candidate for the future electronic devices. Germanium and silicon nanowires, in particular, are compatible …
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Growth and applicability of radiation-responsive silica nanowires
… an important role in processes on the nanoscale. Nanowire growth via vapor-liquid-solid (VLS) mechanism is no exception in this regard. Interfacial and line energies are found to impose some fundamental limits during three-phase nanowire growth and lead to formation of stranded nanowires with …