Optical characteristics of CuO thin film prepared by Chemical spray pyrolysis

CuO thin films have been grown on cleaned glass substrates at 350 C? using spray pyrolysis deposition technique, UV -VIS spectra of the films were recorded using the optical absorbance measurements which were taken in the spectral region from 190 nm to 1100 nm. The ref1ectance spectrum of the films in the UV -VIS region were studied. Optical Constants such as optical energy gap, absorption coefficient and extinction coefficient, were evaluated from these spectra. The film was found to exhibit high absorbance values at ultraviolet region which they decrease rapidly in the visible / near infrared region. The optical allowed gap energy for direct transition was found 2.113 eV.