Influence of thickness on optical properties of a: $As_2Se_3$ thin films

Özet

This paper reports optical properties of amorphous chalcogenide thin films of $As_2Se_3$ of different thicknesses 2000–6800 ˚A. The transmittance and reflectance of thin films were measured in the wavelength range 500–1000 nm. It was found that the optical band gap increases with film thickness. Variation of refractive index n and extinction coefficient k with thickness have been studied to analyze optical efficiency of the $As_2Se_3$ thin films. The dielectric behavior of the films has also been studied and high frequency dielectric constants ε∞ has been estimated as a function of thickness of films.