Probing Unconventional Glasses: Optical Insights into Ga–Ge–Te Alloys

In this article, the optical properties of Ga–Ge–Te alloys, which have the potential to be classified as unconventional glasses, are reported on. Herein, these properties to understand the effect of Ga addition are investigated. Using fourier transformed infrared spectroscopy reflectance and spectroscopic ellipsometry, the dielectric constant, optical bandgap, Urbach energy, and Tauc parameter are determined. The evolution of these parameters with Ga addition is interpreted in terms of the resulting increase in structural disorder within the Ga–Ge–Te alloys.