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

      D Kumar S Kumar

      Thin Films Volume 27 Issue 5 October 2004 pp 441-444

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/027/05/0441-0444

    • Keywords

       

      Chalcogenide glasses; Meyer–Neldel rule; conductivity pre-exponential factor.

    • Abstract

       

      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.

    • Author Affiliations

       

      D Kumar1 S Kumar1

      1. Department of Physics, Christ Church College, Kanpur 208 001, India

    • Dates

       
      Published
      October 2004
      Manuscript received
      9 October 2003
      Manuscript revised
      19 July 2004

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