Preparation and Characteristics Study of ZnS Thin Films by Chemical Bath Deposition Method

Abstract

  Thin films of zinc sulfide (ZnS) have been deposited  by chemical bath deposition technique  using the zinc nitrate salt(Zn(NO₃)₂) was used as a source of zinc ions(Zn⁺²) and thiourea (SC(NH₂)₂) as a source of  negative sulphide ions(S^-2). The effect deposition temperature on the structural and optical properties is described.  The XRD studies revealed that the deposited films have a polycrystalline and the hexagonal structure and the grain size increases from 22 nm to 45 nm  with increasing deposition temperatures. The average transmittance of ZnS films in the visible region was between 40–701% with direct optical energy  decreases from 3.66eV to 3.38 eV with increasing deposition temperature.