Effect of indium doping on (CdZn)Se composite thin films

Cd0.9Zn0.1Se:In thin films with a variable composition (0-1.0 mol% indium) have been grown on a non-conducting glass substrate by chemical bath deposition method. The effect of doping has been investigated. The color of a film was found to be darkening with increase in the concentration of indium. X-ray diffraction, optical absorption, electrical and thermoelectrical techniques were used to characterize the films. The X-ray diffraction study indicates the crystalline nature in single cubic phase over whole range of composition. Analysis of absorption spectra gave direct type of band gap, the magnitude of which varies non-linearly as the indium content in the film increases. The dc electrical conductivity increases up to 0.1 mol%. The promising features observed are the enchantment in crystallinity, grain size, electrical conductivity and decrease in band gap, up to 0.1 mol%.