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The nonlinear interaction of space charge waves including amplification and conversion to high frequencies in n-GaN semiconductor films, possessing the negative differential conductance phenomenon, is presented. The simulation results suggest amplification and frequency multiplication for input signals with frequencies f <; 220 GHz using the balance equations model.
p-microcrystalline-silicon/n-crystalline-silicon hetero-junction solar cell has been prepared by means of hot-wire chemical vapor deposition (HW-CVD) technique. The solar cell structure was illuminated on the opposite side of the normally-formed heterojunction. With this inverted structure, the photovoltaic cell has the design potential increasing the light-incident surface texturing and it avoids...
Polycrystalline films of semiconducting Cu(In1-xGax)Se2 (CIGS) quaternary alloy, one of the promising materials for photovoltaic applications, have been prepared by means of chemical spray pyrolysis (CSP). Copper, Indium and Gallium metal chlorides and Selenourea are used as constituent elements to prepare spray solution. Single phase CIGS films with chalcopyrite structure have been successfully grown...
The non-linear interaction of space charge waves including the amplification in microwave and millimeter wave range in n-InP films, possessing the negative differential conductance phenomenon, is investigated theoretically. Both the amplified signal and the generation of harmonics of the input signal are demonstrated, which are due to non-linear effect of the negative differential resistance. It is...
High quality ZnO films were obtained by thermal oxidation of Zn films on the temperature range from 300 to 700 °C. Zn films of 190 nm in thickness were deposited on silicon and glass substrates by the sputtering technique. Thermal oxidation was done at normal environment conditions. The complete oxidation of the Zn films was determined by the ZnO films transparency. The ZnO films resulted dense with...
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