• N Khare

      Articles written in Bulletin of Materials Science

    • Photoelectrochemical solar cells using electrodeposited GaAs and AlSb semiconductor films

      S Chandra N Khare H M Upadhyaya

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      Electrodeposited GaAs and AlSb thin film semiconductors were prepared under various deposition conditions. Reasonable stoichiometry could be attained as revealed by EDAX studies. The best stoichiometry was obtained are Ga1·04As0·96 and Al1·12Sb0·88. The band gap of the GaAs and AlSb films was ∼1·5 eV and 1·6 eV respectively. The electrochemical and photoelectrochemical studies on these films are reported with different redox-couples in aqueous and non-aqueous medium.

    • Thin films of Y-Ba-Cu-O by rf sputtering and study of Josephson effect

      Mukesh Kumar N D Kataria V S Tomar V N Ojha N Khare S U M Rao G S N Reddy A K Gupta

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      Thin films of Y-Ba-Cu-O material have been prepared by rf diode sputtering using a single oxide target on strontium titanate substrates kept at an ambient temperature. It was found difficult to attain stoichiometry of the films identical to that of the target due to resputtering of the films. The influence of sputtering parameters such as target-substrate distance, rf power, gas pressure and substrate temperature in attaining a particular stoichiometry of the film has been studied. The I–V characteristics of the bridges show Shapiro steps when the bridges are irradiated with microwave radiations. The thin film bridges have the dimensions larger than coherence length; thus all the Josephson effect features are understood to arise due to intergranular junctions.

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