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The effect of Cd addition on the optical properties of Se70Te30 films

Se70Te30 and Se70Te20Cd10 films of different thicknesses were prepared by a thermal evaporation technique. Transmittance and reflectance data are measured for the films obtained, in the wavelength range 400–2500 nm. The optical constants, the refractive index n and the absorption index k, are calculated by an accurate method using Murmann’s exact equations. It is found that values of n at any wavelength for Se70Te30 films are larger than that for Se70Te20Cd10 films. From the analysis of the optical constants it was found that the optical energy gap (Egopt) and the width of the tails of the localized states in the gap region (Ee) increase while the high frequency dielectric constant decreases with the addition of Cd.