Growth and characterization of Cd/sub 0.22/Zn/sub 0.78/S thin films prepared by spray pyrolysis method :Optical and structural properties

Cd 0.22 Zn 0.78 S thin films have been grown on a glass substrate by the spray pyrolysis method using CdCl 2 (0.05 M), ZnCl 2 (0.05 M) and HNCSNH (0.05 M) solutions at a substrate temperature of 261plusmn6degC. The band gap of Cd 0.22 Zn 0.78 S was obtained from the absorbance measurements in the visible range and found to be 3.24 eV. The energy band gap was also determined from the theory of Elliot and Toyozawa as 3.28 eV. X-ray diffraction studies have shown that the CdS grains also formed during the deposition of Cd 0.22 Zn 0.78 S thin films. Morphological studies of the Cd 0.22 Zn 0.78 S thin films were studied by AFM and SEM. Local elemental characterization of the thin film was performed by EDX