The optical properties of mawsonite Cu6Fe2SNS8 [CFTS] thin films effected by red laser irradiation deposited via semi-computerized spray pyrolysis technique

Abstract

The existing investigation explains the consequence of irradiation of red laser on the optical properties of Mawsonite Cu6Fe2SnS8 [CFTS] thin films. The film was equipped by the utilization of semi-computerized spray pyrolysis technique (SCSPT), it is the first time that this technique is used in the preparation and irradiation using a laser. From the XRD analysis, the crystalline existence with tetragonal crystal system was when the received films were processed by continuous red laser (700nm) with power (>1000mW) for different laser irradiation time using different number of times a laser scan (0, 6, 9, 12, 15and18times) with total irradiation time(0, 30, 45, 60, 75, 90 min) respectively at room temperature. The optical properties of mawsonite thin films was struck by laser ray of light. The parameters such as the absorbance, coefficient of absorption coefficient of extinction refractive index, optical conductivity, the real ε1 and imaginary ε2 part of the dielectric constant of the films rises subsequently by laser irradiation, only the transmittance was decremented with laser ray of light. The optical energy gap was reduced from (1.73eV) without irradiation to (1.56eV) and subsequent laser irradiation, and there is a great alteration of optical energy gap values for photovoltaic (PV)utilization. This result due to laser irradiation worked like annealing temperature to enhance the crystallization of the deposited films. And the results showed that the laser irradiation method 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.