Spectral Analysis of Chemical Bath Deposited Copper Selenide Thin Films (original) (raw)

Abstract

ABSTRACT Copper selenide thin films were successfully deposited on glass substrates using the chemical bath deposition technique at room temperature. The chemical bath was composed of copper II chloride dihydrate (CuCl2.2H2O) as the source of the Cu 2+ and Sodium selenosulphate solution (Na2SeSO3) as the source of the Se 2-. Ammonium hydroxide solution (NH4OH) was used as the complexing agent. Some of the films were subjected to post deposition thermal treatments. Spectral analyses of the films were done in order to study their optical absorbance and transmittance, with the aid of Unico-UV 2102 PC spectrophotometer at the normal incidence of light at room temperature. The samples of the films exhibited absorbance ranging from 50 to 85% in the VIS region but showed low absorbance in the NIR regions of the electromagnetic spectrum. The range of the optical band gap is between 1.85eV and 1.95eV. XRD analysis shows that thermal treatments enhanced the crystalline nature of the films and also increased their crystallite sizes.

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