• Air-exposure effect on the resistivity of thin bismuth films

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      https://www.ias.ac.in/article/fulltext/pram/017/06/0453-0459

    • Keywords

       

      Resistivity; grain boundary; oxidation; air-exposure; continuous films; discontinuous films

    • Abstract

       

      A survey of previous studies on vacuum deposited metal films shows that in high frequency measurements, explicit reference to the effect of air-exposure is not made. The present work on bismuth films (in-situ and air-exposed) at dc and rf frequencies, carried out mainly to study the air-exposure effect, shows that in-situdc and rf and exposed rf all show nearly the same resistivity for thick continuous films. But air-exposed dc film resistances, when compared to in-situdc resistances, show that the grain boundary reflection coefficient, Rgin Mayadas-Shatzkes model changes from 0·2 to 0·6. This is shown to be due to the grain boundary oxidation. The result is substantiated by rf measurements.

    • Author Affiliations

       

      S A Gangal1 R N Karekar1

      1. Department of Physics, University of Poona, Pune - 411 007, India
    • Dates

       
  • Pramana – Journal of Physics | News

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