Temperature dependence of d.c. conductivity is studied in 𝑎-Se75In25–𝑥Pb𝑥 thin films where 𝑥 is varied from 0–10. From these measurements, the values of the pre-exponential factor (𝜎0) and activation energy (𝛥𝐸) are calculated for each glassy alloy. An approximate linear dependence of ln 𝜎0 on 𝛥𝐸 is observed in this glassy system with good agreement between the expected and calculated 𝜎0 values using Meyer–Neldel rule. Linear dependence of ln𝜎0 on 𝛥𝐸 in case of amorphous materials indicates that the conduction band tails a finite energy distance towards the valence band and Fermi level is controlled by fixed dominant hole levels deeper in the gap.
Volume 46, 2023
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
Click here for Editorial Note on CAP Mode