Structural and optical properties of electrodeposited Cd0.7Zn0.3Se thin films: Effect of annealing

Thin films of cadmium zinc selenide (Cd0.7Zn0.3Se) were deposited on ITO substrate by electrodeposition technique. The as-deposited films were annealed at 200, 300 and 400 °C for 1 h in ambient air. Composition, surface morphology and structural properties of the as-deposited and annealed films were studied by EDX, SEM and X-ray diffraction techniques, respectively. The XRD study showed the cubic to hexagonal structural transition at 300 °C. The lattice parameters of different phases of the material were calculated from the XRD pattern. The optical absorption spectra were recorded within the range of 350-800 nm. The band gap energies of the films decreased from 2.05 to 1.74 eV with respect to annealing temperature.