CdO thin films have been deposited by Spray Pyrolysis Technique (SPT) on a glass substrate. The structural and optical properties of thin films are studied at different annealing temperatures 100, 200 and 300 Co. By using X-Ray Diffraction, XRD patterns indicated that films are polycrystalline in nature and cubic phase with preferred orientation along the plane (111). The optical properties using UV-VIS spectroscopy show that the direct band gaps decreased from (3 to 2.75) eV with increasing the annealing temperature from(100-300)Co, this decreasing could be ascribed to increase of the localized states available in band gap which referred by Urbach,s energy value.
Keywords: CdO films, spray pyrolysis, optical properties, structure properties.