Studying The Effect Of Metallic Precursor Concentration On The Structural And Optical Properties Of Zinc sulfide Thin Films Synthesized By Chemical Bath Deposition Method

Abstract

Zinc sulfide (ZnS) thin films with different concentrations of zinc chloride (0.3M, 0.5M, 0.7, 0.9M and 1.1M) have been deposited on a glass substrate made by chemical bath deposition technique in basic medium. Zinc chloride, thiourea, ammonia, and hydrazine hydrate were used to synthesize ZnS thin films. The films were annealed at 200°c. This study investigates how the concentration of metallic precursor affect the crystal structure and optical properties of Zinc sulfide thin films. The XRD result shows that no sharp peak which indicates the samples is amorphous nature. UV-Vis spectroscopy was used to analyze the optical characteristics of the deposited thin films. The absorbance increase with increasing of the zinc sulfide concentration and the band gap energy for the films prepared in different concentration of zinc chloride decrease from 3.53 to 3.42 eV with increasing of zinc sulfide concentrations. The results demonstrated that concentration of metallic precursor have distinct effects on optical absorbance and band gap energy.