الخلاصة

Abstract: The ZnxCd1-xS thin films prepared by chemical bath and deposited on glass substrates. A procedure to make optical quality thin films of ZnxCd1-xS has been investigated. Structural and optical properties of ZnxCd1-xS thin films with x = (0.2, 0.5 and 0.7) and T= (300, 423 and 473) K were synthesised-sized. The structural investigation indicates that they have polycrystalline structure. The crystalline size and degree of preferential orientation were found to be increased with the increase of Zn concentration (x) and annealing temperature. Optical data are recorded in the wavelength range 200-1000nm. In addition, the absorption coefficient is determined and correlated with the photon energy to estimate the band gap. Plots of (αhν)2 versus (hν) yield a straight line indicating direct transition occurs with optical band gap energies in the range) 3.3-3.5( EV. It is also found with increase annealing temperature and Zn content the band gap of the films increases. Refractive indices and extinction coefficients have been evaluated.