Pre-exponential factor in ð‘�?-Se75In25â€�?�ð�?�¥Pbð‘�? thin films

Bulletin of materials science

D Kumar¹  S Kumar¹ 

[1] Department of Physics, Christ Church College, Kanpur 208 001, India$$Department of Physics, Christ Church College, Kanpur 208 001, IndiaDepartment of Physics, Christ Church College, Kanpur 208 001, India$$

关键词: Chalcogenide glasses;    Meyerâ€�?�Neldel rule;    conductivity pre-exponential factor.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Temperature dependence of d.c. conductivity is studied in ð‘�?-Se⁷⁵In_{25â€�?�ð�?��?}Pb_ð‘�? thin films where ð‘�? is varied from 0â€�??10. From these measurements, the values of the pre-exponential factor (𝜎₀) and activation energy (𝛥ð�?) are calculated for each glassy alloy. An approximate linear dependence of ln 𝜎₀ on 𝛥ð�? is observed in this glassy system with good agreement between the expected and calculated 𝜎₀ values using Meyerâ€�?�Neldel rule. Linear dependence of ln𝜎₀ on 𝛥ð�? 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.

【 授权许可】

Unknown