Effect of Substrate Temperature on the Structural and Optical Properties of CdO Thin Films Prepared Using Spray Pyrolysis

Cadmium oxide films (CdO) have been deposited on glasse’s substrate at various temperature (150, 250 & 300 °C) using spray pyrolysis technique. Structural properties have been investigated by scanning electron microscope (SEM), X-ray spectroscopy, while optical properties were characterized (linear & nonlinear) using UV-Vis spectrometer and z-scan technique. SEM image shows clear effects of temperature increasing on thin film layer structure. Energy gap was changed from 2.2-2.05eV with substrate temperature. According to third order nonlinearity of CdO optical properties (which are very valuable for laser control device application and optical limiting), open and closed aperture Z-scan technique with (632.8 nm) He-Ne laser wavelength was used to measure the nonlinearity of optical parameters, which included refractive index variation and extinction coefficient.