Study of structural and optical properties of cd(1-x)crxo thin films prepared by chemical spray pyrolysis method

In this study, undoped (CdO) films and Cr doped (with 2,4,6 and 8 wt%) were deposited on glass sub strate at (400 ºC) by chemical spray pyrolysis technique using cadmium acetate as the Cd source. The effect of Cr doping on structural and optical properties has been investigated. XRD investigations showed that all the films were polycrystalline in nature and had a cubic structure with preferred orientation along (111) plane for all doping percentages. It was found that doping with (Cr) led to decrease in the intensity of (111) peak and the average grain size decreases as (Cr) doping percentage increases. The optical characterization of the films have good transmittance in the visible region of spectrum and it increases with Cr-doping, with increase in direct band gap (2.4 eV for undoped to 2.63, 2.65, 2.67 and 2.71 eV) for different values of Cr percentage respectively. The absorption coefficient, reflectance, and Urbach tail were calculated also.