Effects of annealing temperatures on optical and electrical properties of vacuum evaporated Ga15Se77In8 chalcogenide thin films

► Thermal processes are known to be important in inducing crystallization in semiconducting chalcogenide glasses. ► Indium doped chalcogenide glasses has gained a remarkable and great interest due to its potential applications in various digital electronic devices, as digital cameras and camcorders, MP3 players, smart phones, etc. ► Analysis of the optical absorption data shows that the rule of non-direct transitions predominates. ► It was found that the optical band gap decreases with increasing annealing temperature. ► The dc conductivity were observed to increase with the corresponding decrease in activation energy on increasing annealing temperature in the present system.