Optical and structural properties of doped and undoped CdO thin films

Optical and structural properties of pure CdO, Cu:CdO and Al:CdO thin films were presented in this work. The Cadmium Oxide (CdO) semiconducting films were deposited on a glass substrate by dip coating method using Cadmium Chloride as the precursor with ammonium hydroxide. The structural and optical properties of the films were observed. The crystalline structure was studied by X-ray diffraction (XRD) and found the presence of the CdO cubic phase. The variation of absorption with wavelength was studied. The absorption of the film was found to be increased after doping. It revealed that the copper doped thin films, annealed at 500â—¦C has improved the transmittance of these films. The optical band gap of Cu:CdO was observed as 3.70 eV with 4% Cu dope and increased to 3.76eV with 8% Cu dope. But the optical band gap of Al:CdO was observed to be 3.70 eV with 3%Al doping and decreased to 3.66eV with 5% Al doping.