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Thermoelectric Figure of Merit Enhancement in Bi2Te3-Coated Bi Composites

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Abstract

This study examines the thermoelectric behavior of composites containing hydrothermally processed tellurium-coated bismuth particles of various sizes. Since only a very thin layer of Bi2Te3 forms on the particle surface, the high-pressure compacted composite is still dominated by bismuth as the main ingredient (∼96% Bi). Thermoelectric figure of merit ZT values are derived from measurements of thermal conductivity, electrical resistivity, and Seebeck coefficient. As expected, a ZT value almost three times higher than that of bismuth is found. This enhancement appears to be caused mainly by lowered thermal conductivity due to the significant number of grain boundaries, short phonon mean free path in the coating layers, and lattice mismatch.

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Authors and Affiliations

  1. Department of Physics, National Taiwan University, Taipei, 106, Taiwan

    T. W. Lan

  2. Institute of Physics, Academia Sinica, Taipei, 115, Taiwan

    T. W. Lan, J. C. Ho & Y. Y. Chen

  3. Taiwan International Graduate Program, Academia Sinica, Taipei, 115, Taiwan

    T. W. Lan

  4. Institute of Chemistry, Academia Sinica, Taipei, 115, Taiwan

    Y. C. Chen & S. G. Shyu

  5. Graduate Institute of Applied Physics, National Chengchi University, Taipei, 116, Taiwan

    Y. Y. Chen

Authors
  1. T. W. Lan
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  2. Y. C. Chen
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  3. J. C. Ho
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  4. S. G. Shyu
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  5. Y. Y. Chen
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Corresponding authors

Correspondence to S. G. Shyu or Y. Y. Chen.

Additional information

J.C. Ho—Visiting from Wichita State University, Wichita, KS, USA.

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Lan, T.W., Chen, Y.C., Ho, J.C. et al. Thermoelectric Figure of Merit Enhancement in Bi2Te3-Coated Bi Composites. J. Electron. Mater. 41, 2326–2330 (2012). https://doi.org/10.1007/s11664-012-2154-y

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  • DOI: https://doi.org/10.1007/s11664-012-2154-y

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