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Influence of substrate temperature on structural, optical and electrical properties of evaporated cadmium sulphide thin films

The hexagonal cadmium sulphide (CdS) thin films with strong (002) orientation is prepared by thermal evaporation technique. The effect of substrate temperature on the structural, morphological, compositional, optical and electrical properties of CdS thin films is investigated. X-ray diffraction and transmission electron microscopy analysis of the films suggests that films presented hexagonal structure and no secondary or mixed phases are found. Scanning electron microscopy images revealed that the grain size increases with T s while energy dispersive x-ray analysis confirms homogeneity and stoichiometry of films. The analysis of transmission spectra showed that CdS films deposited at different T s had transmission and energy band gap in the range of 60-90% and 2.32-2.40 eV respectively. Electrical characterization of films deposited at different T s carried out using Hall effect measurements suggests that films have resistivity and mobility value in the range of 10 4 Ω cm and 2-40 cm 2 /Vs respectively influenced by substrate temperature.