Enhancement of Seebeck Coefficient and Thermoelectric Efficiency in Mn-doped SnTe Under Compression

POSTER

Abstract

SnTe is known for its high thermoelectric performance and serves as a lead-free analog with a rocksalt structure similar to PbTe. Mn doping in SnTe further reduces thermal conductivity [1,2]. A significant increase in thermopower was previously reported in pristine SnTe under high pressure, which correlates with a known pressure-induced structural phase transition [3]. We further investigated Mn-doped SnTe using a large-volume Paris-Edinburgh press to compare it with the parent compound. Our study revealed a substantial increase in the Seebeck coefficient and figure of merit (ZT). The figure of merit rises dramatically up to 5 GPa, where a structural phase transition occurs. These results highlight the fundamental relationship between structure and thermoelectric properties and suggest that pressure is an effective tool for tuning them.

References

[1]. Guodong Tanbg., etal., Nature 15, 9133 (2024)

[2]. Liu et al., Inorganic Chem., 63, 5389 (2024)

[3]. Baker et al., J.Phy.Chem.Lett., 12, 1046 (2021)

*Portions of this work were performed at HPCAT (Sector 16) and Advanced Photon Source (APS) at Argonne National Laboratory. HPCAT operation is supported by DOE-NNSA's Office of Experimental Sciences under Award DE-NA0001974, DOE-BES under Award DE-FG02-99ER45775, and partial instrumentation funding from NSF. DOE-BES supports APS under Contract DE-AC02-06CH11357. CDAC is supported by DOE-NNSA (DE-NA0003975).

Publication: Enhancement of Seebeck Coefficient and Thermoelectric Efficiency in Mn-doped SnTe Under Compression, Ravhi Kumar, Jason Baker, Changyong Park, Curtis Kenney-Benson, Jaspreet Singh, Vineet Kumar Sharma, Venkatakrishnan Kanchana, Sebastien Lebegue, Ganapathy Vaitheeswaran, Russell Hemley, Andrew Cornelius and Nenad Velisavljevic (Under preparation)

Presenters

  • Ravhi S Kumar

    • University of Illinois at Chicago

Authors

  • Ravhi S Kumar

    • University of Illinois at Chicago

  • Jason L Baker

    • Lawrence Livermore National Laboratory

  • Changyong Park

    • Argonne National Laboratory
    • HPCAT, X-ray Science Division, Argonne National Laboratory
    • HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • Curtis Kenney-Benson

    • Argonne National Laboratory
    • HPCAT, X-ray Science Division, Argonne National Laboratory

  • Jaspreet Singh

    • Departmenet of Physics, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, India

  • Vineet Kumar Sharma

    • Departmenet of Physics, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, India

  • Kanchana Venkatakrishnan

    • Departmenet of Physics, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, India

  • Sébastien Lebègue

    • LEMTA UMR CNRS 7563, 54500 Vandoeuvre-lès-Nancy, France

  • Vaitheeswaran Ganapathy

    • School of Physics, University of Hyderabad, Gachibowli, Hyderabad 500046, India

  • Russell J Hemley

    • University of Illinois at Chicago

  • Andrew Lorn Cornelius

    • University of Nevada, Las Vegas

  • Nenad Velisavljevic

    • Lawrence Livermore National Laboratory