Density of states, DC conductivity and physical properties of Ag 2 S-Ge–Te–Se chalcogenide glassy system

Here, development of some Ag 2 S mixed chalcogenide glassy systems has been discussed in the light of DC conductivity model and variable range hopping model. X-ray diffraction (XRD) pattern has been collected to explore microstructure of them. Various nanophases such as Ag 2 Se and GeSe 2 have been pointed out from XRD studies. Defects have been identified in the form of dislocation, and their roles in the electrical transport properties have been established. FE-SEM micrographs exhibit their amorphous nature with distributed sharper crystal-like structure. Optical phonon frequency may cause to enhance the structural vibrations by means of increasing DC electrical conductivity. Significant enhancement of density of states near Fermi level at low and high temperatures have been explained. Present glassy structure is expected to expand to reduce the scattering cross-section for getting higher values of N(E F ) at higher temperature up to a great extent.