• Grain size dependent optical band gap of CdI2 films

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      https://www.ias.ac.in/article/fulltext/boms/024/03/0297-0300

    • Keywords

       

      Optical properties; thin films; halides.

    • Abstract

       

      The thermally evaporated stoichiometric CdI2 films show good 𝑐-axis alignment normal to substrate plane for film thickness up to 200 nm. The optical absorption data indicate an allowed direct interband transition across a gap of 3.6 eV in confirmation with earlier band structure calculations. However, part of the absorption data near band edge can be fitted to an indirect band gap of 3 eV. The dependence of band gap on film thickness (> 200 nm) can be explained qualitatively in terms of decreasing grain boundary barrier height with grain size.

    • Author Affiliations

       

      Pankaj Tyagi1 A G Vedeshwar1

      1. Department of Physics and Astrophysics, University of Delhi, Delhi 110 007, India
    • Dates

       
  • Bulletin of Materials Science | News

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