• Optical analysis for few TMDC materials

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      https://www.ias.ac.in/article/fulltext/boms/038/07/1791-1796

    • Keywords

       

      Transition metal diachalcogenides; optical parameters; bandgap.

    • Abstract

       

      The transition metal dichalcogenides possess layered structure of Se-M-Se (M = Nb, Mo, Ta and W) sandwich interact with each other by van der Waal forces and can also provide sites for intercalation. Because of their technological importance, lubricants, catalysts, battery cathodes and electrodes in the photoelectrochemical solar cells, much attention has gone in the studies of growth of these materials in crystalline and nanocrystalline forms. In the present work we report the growth of NbSe2, MoSe2, TaSe2 and WSe2 single crystals and determine the optical bandgap using optical absorption. The optical absorption of as-grown crystals has been measured at room temperature near the fundamental absorption edge. Both direct and indirect transitions are involved in the absorption process. The indirect transition was found to be allowed with two phonons involved in the process. The direct and indirect energy gaps and phonon energies for all crystals have been estimated. The results obtained are discussed in detail.

    • Author Affiliations

       

      Mehul Dave1

      1. Natubhai V. Patel College of Pure and Applied Sciences, Vallabh Vidyanagar 388 120, India
    • Dates

       
  • Bulletin of Materials Science | News

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