• V V Rao

      Articles written in Bulletin of Materials Science

    • Photoelectrochemical solar cell fabrication with tungsten diselenide single crystals

      M K Agarwal V V Rao V M Pathak

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      Recent reports on highly efficient photoelectrochemical solar cells withn-type WSe2 have prompted us to grown-type single crystals of WSe2 using a chemical vapour transport method. Different transporting agents have been used. It is seen that SeCl4 transporter leads to very large single crystals ofp-type WSe2, whereas the same transporting agent with excess amount of Se leads ton-type single crystals. PEC solar cells fabricated withp-type andn-type crystals thus grown have been reported and the results discussed.

    • Effect of laser irradiation on the superconducting properties of high-Tc SmBa2Cu3Ox

      B K Roul A K Pradhan V V Rao P Bhattacharya P Pramanic V R Kalvey D N Bose K L Chopra

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      Studies of the effect of high power laser (Q-switched Ruby laser, 694 nm, 30 ns) irradiation on the critical current density (Jc) and magnetic hysteresis at 77K and temperature variation of microwave induced d.c. voltage on SmBa2Cu3Ox ceramic samples have been performed. Irradiation did not substantially changeTc but caused a strong increase inJc and magnetic hysteresis at 77K. The microwave-induced d.c. voltage at 77K showed appreciable decrease after irradiation. SEM studies showed grain growth due to sintering which improves the interconnectivity among the superconducting grains. These are attributed to physical densification and consequent reduction in the number of weak links. The increase of magnetic hysteresis after laser irradiation is presumably connected with the creation of defects which act as pinning centres. Thermal modelling suggests that on irradiation the surface melts up to a depth of 1µ and laser-induced evaporation occurs at energy density of 2·5 J/cm2.

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