Pre-exponential factor in a-Se75In25-xPbx thin films

被引：9
|
作者：
Kumar, D [1 ]
Kumar, S [1 ]
机构：
[1] Christ Church Coll, Dept Phys, Kanpur 208001, Uttar Pradesh, India
来源：
BULLETIN OF MATERIALS SCIENCE | 2004年 / 27卷 / 05期
关键词：
chalcogenide glasses; Meyer-Neldel rule; conductivity pre-exponential factor;
D O I：
10.1007/BF02708561
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Temperature dependence of d.c. conductivity is studied in a-Se(75)ln(25-x)Pb(x), thin films where x is varied from 0-10. From these measurements, the values of the pre-exponential factor (sigma(0)) and activation energy (DeltaE) are calculated for each glassy alloy. An approximate linear dependence of In sigma(0) on AE is observed in this glassy system with good agreement between the expected and calculated sigma(0) values using Meyer-Neldel rule. Linear dependence of ln sigma(0) on DeltaE 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.
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页码：441 / 444
页数：4
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