Study of structural and optical properties of CdS thin films depending on chemical deposition time

CdS thin films have been prepared by chemical deposition onto glass substrates for potential use as buffer layers in thin film photoconverters. Using X-ray phase analysis and Raman spectroscopy, it was established that CdS films synthesized in optimal technological conditions are crystallized in the hexagonal wurtzite structure. It has been shown that deposition time affects the growth rate, morphological and microstructural characteristics of the synthesized material. With increasing deposition time at a given solution temperature, a significant decrease in surface roughness is observed, accompanied by a decrease in the size of crystallite clusters and microstructural defects. The optical band gap of CdS films is 2.53–2.57 eV. The presence of a pronounced green emission band in the photoluminescence spectra indicates that CdS films have a high degree of crystallinity with a minimum defect density.