Abstract: The structual, electronic and optical properties of Znx Cd(1-x) S and Znx Cd(1-x) S (In) thin films (0.0 <= X <=0.6) fabricated using the chemical spraying method have been investigated. The films are deposited on glass substrates at 420°C substrate temperature. The related optical data are recorded in the wavelength range 200-700 nm. In addition, the absorption coefficient is determined and correlated with the photon energy in order to estimate the direct transition energy bandgap. Our X-ray diffraction investigations confirm the preferential orientation of these polycrystalline films along the hexagonal (002), (100) and (101) planes. Also, film surface structure is studied using an optical microscope. Thin films of Znx Cd(1-x) S are known to have properties in between those of CdS and ZnS. Because of the addition of ZnS, the Znx Cd(1-x) S band structure has a larger energy gap than CdS. This makes the material much more attractive for the fabrication of solar cells. Indeed, the best CdS solar cells have prepared on Znx Cd(1-x) S substrates.