Ionic conductivity study of LiI-Ga₂S₃-GeS₂ chalcogenide glasses using a random-walk approach

Abstract

Electrical properties of a set of lithium-ion conducting sulfide glasses with general formula 20LiI-xGa 2 S 3 -(80-x)GeS 2 (x = 10, 15 and 20) is studied in the present article. The experimental data obtained using impedance spectroscopy are analyzed by means of a random-walk (RW) model assuming that the conduction takes place by a random motion of Li + ions. The influences of added gallium on the structural network and on the conductivity of prepared glasses are also analyzed using the RW model. The results are further confirmed by Raman spectral analysis. The results obtained by the random-walk model and by a conventional equivalent electric circuit model are in a good agreement. We observed that the addition of Ga 2 S 3 contributed to phase separation in the prepared glassy system and negatively influenced the conductivity of the studied glasses. Factors contributing to the total conductivity with respect to the amount of both LiI and Ga 2 S 3 are also reported.

GeS2–Ga2S3–LiCl Glass System: Electrical Conductivity and Structural Considerations

“…Generally, they attribute this feature to the elimination of nonbridging sulfur (NBS) and formation of weak bonds between [GaS 4/2 ] − units and Li +. In our experiments, the effect of the GeS 2 /Ga 2 S 3 ratio on the conductivity is found to be relatively negligible. This could be the result of the preferential formation of ETH, instead of GaS 4/2 units of the above structural considerations.…”

Study of the nanostructure of free volume and ionic conductivity of polyvinyl alcohol doped with NaI

“…The solid electrolytes can be used in energy conversion systems such as photo‐electrochemical (PEC) solar cells and fuel cells, in energy storage devices like solid‐state batteries/micro batteries 22 . Na + doping was experimentally used for the preparation of Cu(In, Ga)Se 2 (CIGS) solar cells to improve the performance of CIGS solar cell devices 23 . In addition, the effect of Na + ions on the electronic properties and structure of the CIGS absorption layer was studied by Gudez et al 24 They concluded that Na diffusion enhanced p‐type conductivity in Cu(In, Ga)Se 2 .…”

High speed chalcogenide glass electrochemical metallization cells with various active metals

“…The diffusion process, particularly of Ag, can be significantly enhanced by illumination [3], with applications in photolithography and waveguide formation. The diffusion can also be enhanced by an electric field, with applications in phase change memory where electric field induced Ag doping of Sb 2 S 3 reduces its crystallisation time [4], in battery technology [5], and electrochemical metallization (ECM) cells. In ECM cells, metal ions diffuse from an active metal (M) electrode under the influence of a positive electric field into a solid electrolyte, the metal ions then precipitate into a metallic filament which forms a conductive bridge between an inactive electrode and the active electrode, drastically reducing the resistance of the cell.…”