THE EFFECT OF THICKNESS AND GAMMA-RADIATION ON THE OPTICAL-PROPERTIESOF THIN (AS2S3)(1-X)IN-X AMORPHOUS FILM

The effects of composition and thickness of amorphous thin films of (A s2Se3)(1-x)ln(x) (0 less than or equal to x less than or equal to 0.5) on their optical properties have been investigated. Optical absorptio n measurements showed that the fundamental absorption edge is a functi on of glass composition, the optical absorption is due to indirect tra nsition and the energy gap increases with x = 0.01 and decreases with x = 0.05. On the other hand, the width of the band tail E(e) exhibits the opposite behaviour. This behaviour is believed to be associated wi th the compensation of hole traps as well as the generation of excess electronic localized states. The optical band gap E(opt) was found to be almost thickness-independent (100 less than or equal to t less than or equal to 250 nm). Also, it was observed that the prepared films ar e almost stable against gamma-doses up to 22 Mrad.