• A Banerjee

      Articles written in Bulletin of Materials Science

    • Flash-evaporated thin films of CuInSe2

      R D Pachori A Banerjee K L Chopra

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      Flash-evaporated technique has been developed for deposition of CuInSe2 thin films. A control over the stoichiometry and chemical composition of the films has been obtained by varying the deposition parameters. Single phase chalcopyrite structure films with optical gap ∼ 1·15 eV have been obtained. The electronic properties of the films have been tailored for solar cell applications.

    • History effects in low-field magnetoresistance of BPSSCO polycrystals

      A Das A Banerjee R Srinivasan

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      Low-field (H<40 G) magnetoresistance measurements have been made on Bi1·6Pb0·4Sr2Ca2Cu3O10 polycrystals at several temperatures between 80 and 105 K. Considerable hysteresis in ρ(H) is found in a zero-field-cooled sample when the applied field is increased from 0 to a maximum value and then lowered back to 0 at all temperatures. The observation of hysteresis is taken as an evidence for field trapping in the grains. We show that the hysteresis in ρ(H) occurs for applied fields much lower than that at whichdρ(H)/dH exhibits a discontinuity. In addition, we find that when the applied magnetic field (Ha) is lowered from a maximum field, the effective intergranular field,Heff, becomes zero forHc>0, which gives rise to a minimum in ρ(H).

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