Study of the Effect of Gallium (Ga) Doping on Different Properties of Cadmium Oxide (CDO) Thin Film

Abstract

The sprayed CdO and Ga doped CdO thin films were successfully fabricated onto glass substrate. The optical and electrical properties of the CdO films have been studied with respect to Ga doping concentration. The absorbance and reflectance of CdO thin films decreases with the increases of Ga content up to 3% and then increases afterwards. The value of absorption coefficient of deposited films is in the order of 10⁶ increases and increases with increasing photon energy. The values of real part is higher than imaginary part of (0-5)% Ga doped CdO films. As the doping concentration of Ga increases, the optical conductivity of CdO initially decreases and then increases. The electrical conductivity of undoped & doped CdO films decreases with the increases of temperature i.e. all films has poor metal like behavior. Therefore, the electrical conductivity of the CdO thin films increases from 1.72  10³ mho/cm to 8.17  10³ mho/cm when the film is doped with 3% Ga and then decreases afterwards.