Substrate-temperature effect on the microstructural and optical properties of ZnS thin films obtained by close-spaced vacuum sublimation



The effect of substrate temperature (Ts = 373–973 K) on the structural and optical properties of ZnS films obtained by a close-spaced vacuum sublimation technique has been studied. Examination of layers morphology and structure was performed by scanning electron microscopy and X-ray diffraction methods. The results of these studies enabled determination of the dependence of the main structural film parameters (texture, surface roughness, lattice parameters, grain and X-ray scattering domain sizes, microstrain) on the growth conditions. Optical characteristics were studied in the range of wavelength near the “red edge” of ZnS photoconductivity. Spectral distributions of transmission coefficient T (λ), refractive index n (λ), extinction coefficient k (λ) and their dependence on the deposition temperature of ZnS films are obtained. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)