Effect of Cd Concentration on the Structural, Morphological and Optical Properties of Chemical Bath Deposited (Cd: Zn)S Thin Films.

Cadmium Zinc Sulphide (Cd: Zn)S thin films were prepared by chemical bath deposition method for different molar concentrations of Cd under the same conditions of temperature, pH and deposition time. Structural, optical and morphological properties of the films were investigated. All the films showed nanocrystallinity with hexagonal structure and the average grain size was found to decrease with increase in Cd concentration. Tunable band gap has been observed with controllable concentration of Cd atoms in to ZnS lattice. The photoluminescence spectra showed broad and asymmetric emission due to the combination of near band edge emission and emission from intrinsic point defects. [ABSTRACT FROM AUTHOR]