Radiation effect on some morphological properties of Ag-As-Te thin films

The effect of gamma irradiation on the features as well as of the optical properties of Ag x As 50-x Te 50 with 3 x 20 films has been studied. The films showed that it was partially transformed from the amorphous to a crystalline one at doses 0.5 to 3 KGy. Gamma radiation effect on the optical spectrum of Ag-As-Te films have been studied for deposited films before and after each radiation dose. It was found that the calculated optical energy gap (Eg) was decreased by increasing Ag content and also, was decreased with the radiation dose up to 3 KGy. Increasing the radiation dose up to 3 KGy induced was indirect transition and consequently decreased the energy gap. This behaviour was associated with the generation of excess of electronic localized states. The surface morphology was investigated by scanning electron microscope (SEM). It showed that grains developed on the film surface depend on Ag at. % and gamma irradiation, through which morphology has been demonstrated