Effect of cu variation on the optical and structural properties of thermally deposited cu-AsSe<inf>1.4</inf>i<inf>0.2</inf> thin films

Abstract

Raman spectroscopy and optical transmission spectroscopy were used to study the structure of Cux(AsSe1.4I0.2)100-x amorphous thin films and the influence of copper content on some optical properties important for applications. It was shown that 25 at.% of copper content in investigated system induces changes in the structure of glass matrix. In investigated amorphous thin films with high copper concentration of 25 at.% presence of one or a mixture of cage-like molecules (As4Se4, As4Se3) and As2(Se1/2)4 ethylene-like units has been confirmed; those structural units were not detected in samples with 0 to 5 at.% of copper.