Applicability of different models of energy bandgap and refractive index for chalcogenide thin films

Abstract The optical parameters are critical factors for the development of optoelectronic devices. Here the authors report the study of optical parameters based on some empirical relationship for Ga doped Ge-Te-Se. These relationships are based on the specific models proposed for the calculation of binary, ternary, and quaternary chalcogenide glasses for the specific range of energy gap. The empirically calculated values of optical parameters from these models are compared with the experimental value of the chalcogenide thin films. The values of refractive index have been calculated from the optical bandgap. Some relations proposed by different authors show good agreement between the experimental and calculated values. It has been concluded that Ravindra & Gupta, Reddy & Duffy, Kumar & Singh, and Reddy provide the satisfactory results.