• Crystal growth, electrical and photophysical properties of Tl2S layered single crystals

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      https://www.ias.ac.in/article/fulltext/pram/072/05/0871-0885

    • Keywords

       

      Thallium chalcogenides; crystalline solids; electrical conduction; photosensitivity.

    • Abstract

       

      The Tl2S compound was prepared in a single crystal form using a special local technique, and the obtained crystals were analysed by X-ray diffraction. For the resultant crystals, the electrical properties (electrical conductivity and Hall effect) and steady-state photoconductivity were elucidated in this work. The electrical measurements extend from 170 to 430 K, where it was found that $\sigma_{\perp} = 8.82 \times 10^{−5}$ Sm-1 when current flow direction makes right angle to the cleavage plane of the crystals. In the same range of temperatures, it was found that $\sigma_{\parallel} = 4.73 \times 10^{−5}$ Sm-1 when the current flow is parallel to the cleavage plane. In line with the investigated range of temperatures, the widths of the band gaps were calculated and discussed as also the results of the electrical conductivity and Hall effect measurements. In addition, the anisotropy of the electrical conductivity $(\sigma_{\perp} / \sigma_{\parallel})$ for the obtained crystals was also studied in this work. Finally the photosensitivity was calculated for different levels of illumination as a result of the photoconductivity measurements, which showed that the recombination process in Tl2S single crystals is a monomolecular process.

    • Author Affiliations

       

      A M Badr1 H A Elshaikh1 I M Ashraf1

      1. Physics Department, Faculty of Science (Aswan), South Valley University, Egypt
    • Dates

       
  • Pramana – Journal of Physics | News

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