Photoinduced changes in optical properties of obliquely deposited As₂S₃, As₂Se₃ and As-Se-Ge films

Abstract

Photoinduced changes in the absorption edge and refractive index of 0° and 80° angle-of-incidence deposited As₂S₃, As₂Se₃ and As-Se-Ge films have been investigated in the vicinity of the absorption edge. No appreciable effect of oblique deposition has been observed in As₂X₃ (X = S, Se). There are large irreversible changes, however, on exposure of As-Se-Ge films deposited at 80° incidence. The enhancement of photo-effects on addition of Ge in obliquely deposited films is primarily due to the large photoinduced volume changes.