Dependencies of Optical Properties on the Thickness of SnO2 Thin Layers Grown with CSP Method

Optical Properties of SnO

Abstract

Optically transparent oxide thin layers have been the subject of considerable interest over the past century due to their potential applications. As a result, the development of thin films with high optical transparency has been a prominent area of investigation. SnO2 represents a significant member of the oxide materials family, exhibiting exceptional optical transparency across a broad range of the electromagnetic spectrum and low electrical resistance. In this study, the optical properties of pure SnO2 thin layers were investigated. For this purpose, different thicknesses (510, 630, 770 and 940 nm) prepared by chemical spray pyrolysis (CSP) technique and deposited on glass substrates at 400 °C. Within the visible-region, the SnO2 films exhibited a high optical transmittance of “85-90%”, it was observed that an increase in thickness of the thin layers resulted in a reduction in band gap, high absorbance and low transmittance. For wavelength (330-900 nm) the following parameters were calculated: absorption coefficient, index of refraction, constants of real and imaginary dielectric, extinction coefficients, optical conductivity and energy gap for all types of optical electronic transitions by using Shimadzu UV-2450 spectrophotometer.