Highly conducting nanophases of Ag2S–Se-Ge chalcogenide glassy systems: Explanations via computational descriptions

The temperature and frequency dependent AC conductivity of some Ag2S doped chalcogenides is prepared in the laboratory and experimental data have been collected. Its structural analysis is carried out with X-Ray Diffraction and UV–Vis Spectroscopic methods. The estimated values of optical band gap energy, Egare found to increase with Ag2S content and the present system may be classified as allowed indirect band gap semiconductor. The density and molar volume of as-prepared samples have also been estimated. The AC conductivity of this system has been found to obey the Meyer-Neldel (MN) rule. The decrease of Meyer-Neldel characteristic energy EMN with compositions has been observed. Higher conductivity as well as hopping frequency should be caused due to highly conducting Ag2Senanophases, which is confirmed from DFT and Density of States (DOS) spectra.