Features of the optical properties of chalcogenide glassy semiconductor Ge-As-Se(Te) systems

In this work were determined the optical band gap (Eg), packing coefficient (𝜘) and average atomic volume (Va) by conducting experiments to measure the optical transmission spectra and density (ρ) of chalcogenide glassy semiconductors of Ge-As-Se(Te) systems. Reasons of changes occurring in the band gap and in the structure of the amorphous matrix of the studied materials were suggested taking into account existing ideas about the nature of the band energy spectrum of chalcogenide glasses and analysis of experimental data. The dependence of ϰ and Va on Z and R are investigated for stoichiometric compositions of As25Ge12.5Se(Te)62.5 and the nature of these dependencies were explained in detail.