EFFECT OF CONCENTRATION ON STRUCTURAL AND OPTICAL PROPERTIES OF CUS THIN FILMS

Sangamesha M.A, K. Pushpalatha, G.L. Shekar

Abstract: Thin films of Copper sulphide were deposited on glass substrates using chemical bath deposition technique at room temperature from the aqueous solution containing different concentration of copper sulphate between 0.05M and 0.15M. The effects of the copper concentration of the chemical bath on structural and optical properties of the amorphous thin film were investigated and discussed. The optical absorption and transmission of the thin films were observed between of 330-1100nm taken at room temperature. The optical band gaps of the as-synthesized copper sulphide thin film for various concentrations were measured. The surface morphology has been observed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The results obtained from AFM demonstrated that the reflectivity was closely related to the surface roughness of the film. High surface roughness has a strong scattering effect on light and lowers the reflectivity. X-ray diffraction (XRD) patterns show that crystallinities of the films are dependent on the copper concentration in the solution

Keywords: Copper sulphide, CBD; XRD; AFM; SEM; Thin films

DOI: https://doi.org/10.15623/ijret.2013.0211035