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We report a SiC MEMS microhotplate designed for high temperature characterization of nanomaterials in transmission electron microscopes (TEMs). The microhotplate integrates, for the first time, a microheater of doped polycrystalline silicon carbide (poly-SiC) and electron-transparent windows of amorphous SiC (a-SiCx) on a freestanding membrane of undoped poly-SiC. Our work focuses on the development...
ZnO thin films were deposited using thermal chemical vapor deposition (TCVD) using gold as the catalyst in a two furnaces system. Carbothermal technique is employed in this work where graphite was mixed into ZnO powder with 1:1 ratio as the precursor. Different thicknesses of gold were deposited on the substrate to study its effect to the properties of the thin films. The ZnO nanostructures were then...
This paper reports on the effect of annealing temperature on the photoluminescence (PL) properties of ZnO thin film. Sol-gel spin coating method was used to prepare the ZnO templates on silicon substrate. ZnO thin films were then deposited by thermal chemical vapor deposition technique by using Zinc Acetate dihydrate as a precursor. Deposited films are annealed at various temperatures; from 650°C...
Thin film ZnO/Si heterojunction solar cells were explored for their potentially low cost application. Microcrystalline silicon (??c-Si) deposited by metal induced growth (MIG) demonstrated viable photo response as a thin film base layer. Modeling using AMPS-1D was performed on various heterostructures. In thin film devices, Interface defects of 8.8??1011 1/cm2-eV were shown to significantly reduce...
ZnO acicular nanostructure was designed and grown from aqueous solution on the conductive substrate. The diameter of ZnO was 50 nm and length was about 5 mum. due to the large aspect ratio, the as-prepare ZnO sample was applied in filed emission with turn-on electric intensity of 3.2 V/mum and enhancement factor beta of 2830.
In this paper, we have studied the contact effect on the field emission properties of ZnO nanostructure printed on various substrates to understand emission performance more exactly. Here we demonstrated the field emission properties from the tetrapodlike ZnO nanostructure screen printed on Ag, carbon nano fiber (CNF)/Ag substrate respectively. The ZnO nanostructure is produced by chemical vapor deposition...
We are presenting porous-structured ZnO films grown by two-step chemical bath deposition (CBD), which has the potential to be used as a porous electrode in dye-sensitized solar cells (DSSCs). ZnS films were deposited on corning glass substrates by a stirred aqueous solution. Subsequent oxidization of ZnS films gave rise to ZnO thin films. The ZnO films exhibited a strong (002) diffractive peak, which...
We prepared silicon carbide (SiC) thin films by hot-wire chemical vapor deposition (HW-CVD) using methane as a carbon source gas at substrate temperature of 325degC and investigated the influence of filament temperature, Tf, on the structure and optical properties of the resulting films. X-ray diffraction patterns showed that film prepared at Tf=1400degC was amorphous SiC:H and that films prepared...
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