Abstract
In this work, Cd0.5Zn0.5S thin films were successfully deposited onto glass substrates by spray pyrolysis. Their structural, morphological, optical and electrical properties were investigated as a function of the S2- concentration. According to the x-rays diffraction (XRD), the deposition films have less polycristallinity with crystallites size varied between 16 and 32 nm as a function of S2- concentration. The scanning electron microscopy (SEM) revealed that the deposited films were non-uniform nanostructures. The UV–visible spectroscopy showed that the transparency of the films depend on the S2- concentration in the precursor solution. The band gap energy and the refractive index vary inversely as a function of the S2- concentration. The correlation between the increase of the intensity of the VS corresponding PL peak and the decrease of the electrical resistivity confirms the donor role of sulfur vacancies (VS).
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