Thin films of cadmium stannate were prepared using thermal chemical spray pyrolysis technique. Cadmium stannate solution (0.2M) was prepared by dissolution of CdCl2·5H2O in C2H5· OH and dissolution of SnCl2·3H2O in CH3COOH at molar 2:1, respectively. The Cd2SnO4 solution was sprayed on glass substrate that was kept at 300K. The studies of structure showed that the prepared thin films were amorphous. After annealing, no changes were observed in the structure. The type of electronic transition was determined by studying the Ultra Violet/Visible (UV/V) spectrum. Energy gap, tail width of localized states, refractive index, reflectance, and extinction coefficient were calculated before and after annealing. The optical constants were found to increase by increasing annealing temperature and thickness of the prepared films.
