Effect Zinc Ion Concentration on Structural and Optical Properties of ZnS Thin Films Prepared by Chemical Bath Deposition Technique

In this work, ZnS films were prepared by chemical bath deposition technique where the zinc nitrate salt (Zn(NO3)2) was used as a source of zinc ions(Zn) and thiourea (SC(NH2)2) as a source of negative sulphide ions(S). The effect cadmium ion concentration at 0.05 M and 0.1 M on the structural and optical properties is described. Annealing process is carried out in air at temperature 473K for 2h. The structural properties were studied by X-ray diffraction, where found that for ZnS films Effect Zinc Ion Concentration on Structural and Optical Properties of ZnS ... 80 deposited on glass substrates have cubic (zinc blende) structure and the grain size increases from 14 nm to 22 nm with increasing zinc ion concentration in solution. The optical properties were studied by transmission spectra where found that for ZnS films have highly transmittance in visible region of spectrum and reach to more than 80%. The ZnS films have wide band gap and decrease from 3.62 to 3.57 eV with increasing zinc ion concentration in solution.