Growth of TiSe2 Thin Films Using Chemical Vapor Transport

ORAL

Abstract

TiSe$_2$ is a member of transition metal dichalcogenide family of layered van-der-Waals materials that exhibits some distinctive electronic and optical properties due to the presence of excitonic condensate and strong electron-phonon coupling. This makes TiSe$_2$ a candidate for electronic, thermoelectric, and energy applications. We report on the growth of TiSe$_2$ thin films using chemical vapor transport with I$_2$ as a transport agent. Atomic force microscopy and transmission electron microscopy are used to determine the structure of grown films confirming single-crystalline layered structure of the films. Kelvin probe microscopy and resistivity measurement show transition into charge density wave state at temperatures below 180 K. Somewhat lower CDW transition temperature than in single crystals suggests carrier doping due to presence of intrinsic defects.

*This work was supported as part of the CCDM, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science under Award #DE-SC0012575.

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Authors

  • T. Polakovic

    • Dept. of Physics, Drexel University, Philadelphia, PA 19014

  • M. Bowen

    • Dept. of Physics, Drexel University, Philadelphia, PA 19014

  • M. Precner

    • Dept. of Physics, Drexel University, Philadelphia, PA 19014

  • J. Curtis

    • Dept. of Physics, Drexel University, Philadelphia, PA 19014

  • J. Rayer

    • Dept. of Physics, Drexel University, Philadelphia, PA 19014

  • S. Ciocys

    • Dept. of Physics, Drexel University, Philadelphia, PA 19014

  • E. Das Gupta

    • Dept. of Physics, Drexel University, Philadelphia, PA 19014

  • G. Karapetrov

    • Drexel University
    • Dept. of Physics, Drexel University, Philadelphia, PA 19104
    • Dept. of Physics, Drexel University, Philadelphia, PA 19014

  • Q. Qiao

    • Brookhaven National Laboratory and Dept. of Physics, Temple University, Philadelphia, PA 19122

  • Yimei Zhu

    • Brookhaven National Laboratory
    • Brookhaven National Laboratory, Upton, NY 11973
    • Brookhaven Natl Lab
    • BNL