On thermoelectric properties of SnSe and SnSe2 single crystals

ORAL

Abstract

Thermolelectric materials can serve for conversion between thermal and electrical energy. In the search for new thermoelectric materials, layered SnSe and SnSe2 are promising candidates. We have successfully synthesized SnSe and SnSe2 single crystals by the modified Bridgman method and studied their thermoelectric properties: thermopower (S), thermal conductivity (κ), and electrical conductivity (σ) in the temperature range between 2 K and 400 K. Compared to SnSe2 at 300 K, we find that SnSe exhibits higher electrical conductivity, higher thermopower, and lower thermal conductivity, thus resulting in the higher figure of merit. Hall effect measurements reveals that the Hall mobility in SnSe is an order higher than that in SnSe2, advancing its thermoelectric performance.

*This work was partially supported by the Department of Energy through the grant DE-SC0024501.

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Presenters

  • Abhinna Rajbanshi

    • 1SmartState Center for Experimental Nanoscale Physics, Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208, USA

Authors

  • Abhinna Rajbanshi

    • 1SmartState Center for Experimental Nanoscale Physics, Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208, USA

  • Daniel Duong

    • SmartState Center for Experimental Nanoscale Physics, Department of Physics and Astronomy, University of South Carolina, SC 29208, USA

  • Rongying Jin

    • University of South Carolina
    • SmartState Center for Experimental Nanoscale Physics, Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208, USA

  • Eklavya Thareja

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA
    • Louisiana State University
    • Louisiana State University, University of South Florida

  • William A Shelton

    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA