Low temperature TE properties of BiSb with magnetic field

ORAL

Abstract

Thermoelectric (TE) technology plays an important role in converting the currently under-utilized thermal energy directly into electrical power from renewable and waste heat sources in an environmentally friendly manner. Recently, the study on high efficiency TE materials draws attentions of many research groups. Among different TE materials, solid solution alloy of BiSb, as known as the first topological insulator, has one of the best TE performance at low temperature range (20K\textasciitilde 220K). Starting from adding 7{\%} Sb, the semi-metallic bismuth will lose its overlapping between valence band and conduction band and becomes a narrow gap semi-conductor up to 22{\%} Sb. What's more, large enhancement in thermal power of BiSb in magnetic fields was observed, which can be explained based on the transverse-transverse thermo-galvanomagnetic effects. In our research, we studied the segregation effect which strongly affects the sample homogeneity and also built models to describe magneto-Seebeck and magneto-resistivity of BiSb, which could be a hopeful way to pursue higher TE performance.

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Authors

  • Sheng Gao

    University of Virginia

  • Jonathan Tan

    Duquesne University, Baker Hughes, Hampton University, Korea Research Institute of Standards and Science, Electronics and Telecommunications Research Institute, Texas Christian University, University of North Texas Health Science Center, Austin Peay State University, Virginia Military Institute, Pennsylvania State University, University of Virginia, Washington University, National Institute for Materials Science, Japan, Tokyo Metropolitan University, Japan, Univ of Kentucky, Argonne National Laboratory, Oak Ridge National Laboratory, Univ of Virginia, James Madison University, Department of Chemistry & Biochemistry, High Point University, Department of Chemistry, High Point University, Department of Physics, James Madison University, Department of Physics & Astronomy, Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, VA, Institute of Renewable Energy and Environment Technology, University of Bolton, Bolton, UK, Division of Materials Science and Engineering, Ames Laboratory, US Dept. of Energy, Ames, IA, Lehigh University, University of Pardubice, Universite de Rennes, Jan Dlugosz University, Translume, NSCL/FRIB, Duke University, University of Massachusetts - Amherst, University of St. Andrews, National Radio Astronomy Observatory, University of Florida, Yale University, None, Georgia College & State Univ, Georgia College & State University, National University of Sciences and Technology (NUST), Univ of Tennessee Space Inst, The University of Virginia, Chiang Mai University, DHA Suffa University, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic, Department of Physics and Astronomy, Austin Peay State University, Clarksville, TN, United States, George Mason University, Northern Virginia Community College, Department of Physics, University of Virginia, Istanbul University, Georgia College and State University, University of Houston, Western Kentucky Univ, James Madison University, Virginia Polytechnic Institute and State University, Pontifica Universidad Catolica de Chile, Trent University, Univ of Arizona, Ohio State University, NRAO, University of Virginia/NRAO