Optical properties of As2S3 layers deposited from solutions

Prepared As2S3 layers were characterized by transmission spectroscopy in the wavelength range of 200-100 nm. Thicknesses of applied layers in the range of 200-1500 nm and their refractive indices ranging from 1.7 to 2.3 at 800 nm were estimated from interference bands in measured transmission spectra using Swanepoel's method. Dispersion curves of the refractive index are shown in the paper. Optical band gaps of prepared layers in the range of 2.15-2.35 eV were determined from measured transmission spectra by using Tauc's extrapolation.