An Investigation of the Effect of Time Exposure of Nonthermal Plasma on the Optical Properties of CdO Thin Film Prepared by Pulsed Laser Deposition

Abstract

The optical properties of pure (CdO) films have been studied through the measuring of the absorbance spectrum and transmittance spectrum using (UV-VIS) spectrometer within the range of wavelengths (310-1100) nm, and the results showed that the electronic transitions of pure (CdO) films prepared have allowed direct transition type, and the optical energy gap type was identified and was direct energy gap and it was found that the value of the energy gap decreases when the deposition time increases by using (Nd:YAG) laser, and it was also found that the energy gap decreases by the increase of the exposure time to non-thermal plasma. It was observed that the increase of laser deposition time leads to the decrease of the absorbance before the exposure to non-thermal plasma, but the absorbance increases by the increase of the exposure to non-thermal plasma. Absorption Coefficient was also calculated and its value was higher than (α > 104 cm-1) in the high absorption region.