Comparison consequence of violet and red laser irradiation on the optical properties of cobalt dioxide (CoO2) thin films prepared via (SCSPT)

Abstract

The present investigation explains the consequence of irradiation of violet and red lasers on the optical properties of Cobalt dioxide (CoO2) thin films. The film was prepared by employing semi-computerized spray pyrolysis technique (SCSPT), when the received films were processed by continuous violet laser (405 nm) with power (1W) and red laser (700nm) with power (1000mW) for different laser irradiation time (0, 30, 45, 60, 75, 90 min) respectively at room temperature. The optical properties of CoO2 thin films was effected by laser irradiation. Where the parameters such as the absorbance, coefficient of absorption coefficient of extinction refractive index, optical conductivity, the real 𝜀1 and imaginary 𝜀2part of the dielectric constant of the films rises subsequently by laser irradiation, only the transmittance was decreased with laser irradiation time. The optical energy gap CoO2 was decreased from (1.98eV) to (1.52eV) after violet laser irradiation. While it changed from (1.91 eV) to (1.57eV) after red laser irradiation in different time and there is a great alteration of optical energy gap values for photovoltaic (PV) utilization. This result due to laser irradiation worked as heat treatment to enhance the crystallization of the deposited films. And the results showed that the laser irradiation process has a clear change in the optical properties with less time and energy than the traditional annealing methods which is the aim of this study.