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Enhancement of the Thermoelectric Performance of Si-Ge Nanocomposites Containing a Small Amount of Au and Optimization of Boron Doping

  • Topical Collection: International Conference on Thermoelectrics 2019
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Abstract

In the present work, Si65-xGe31Au4Bx (x = 1, 2, 3, and 4) nanocomposites were synthesized by ball milling and spark plasma sintering to investigate the boron concentration dependence of thermoelectric properties. The electrical resistivity observed for samples made at 2 ≤ x ≤ 4 was almost constant over a wide temperature from 300 K to 1000 K, indicating the strongest scattering limit with disordering. All samples possessed the large Seebeck coefficient, mainly, B-1% and B-3% doped sample shows the significant Seebeck coefficient exceeding 450 μVK−1, which was presumably attributed to a sharp peak in the electronic density of states near the valence band edge. As a result, the largest power factor of 2.1 mWm−1K−2 was observed at x = 3. In addition, the lowest thermal conductivity less than 1.3 Wm−1K−1 was observed for x = 2,3, and 4. The significant power factor, together with low thermal conductivity naturally led to obtain high ZT value of 1.63 at 973 K. This value is much higher than that of previously reported other Si-Ge based nanocomposites.

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Authors and Affiliations

  1. Research Center for Smart Energy Technology, Toyota Technological Institute, Nagoya, 468-8511, Japan

    Omprakash Muthusamy, Swapnil Ghodke, Saurabh Singh, Kévin Delime-Codrin, Masaharu Matsunami & Tsunehiro Takeuchi

  2. Sumitomo Electric Industries, Ltd, Hyogo, 664-0016, Japan

    Shunsuke Nishino, Masahiro Adachi & Yoshiyuki Yamamoto

  3. CREST, Japan Science and Technology Agency, Tokyo, 102-0076, Japan

    Tsunehiro Takeuchi

  4. Institute of Innovation for Future Society, Nagoya University, Nagoya, 464-8603, Japan

    Tsunehiro Takeuchi

  5. Graduate School of Science and Technology, Shizuoka University, Hamamatsu, 432-8011, Japan

    Santhanakrishnan Harish & Masaru Shimomura

Authors
  1. Omprakash Muthusamy
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  2. Swapnil Ghodke
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  3. Saurabh Singh
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  4. Kévin Delime-Codrin
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  5. Shunsuke Nishino
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  6. Masahiro Adachi
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  7. Yoshiyuki Yamamoto
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  8. Masaharu Matsunami
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  9. Santhanakrishnan Harish
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  10. Masaru Shimomura
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  11. Tsunehiro Takeuchi
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Correspondence to Omprakash Muthusamy.

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Muthusamy, O., Ghodke, S., Singh, S. et al. Enhancement of the Thermoelectric Performance of Si-Ge Nanocomposites Containing a Small Amount of Au and Optimization of Boron Doping. J. Electron. Mater. 49, 2813–2824 (2020). https://doi.org/10.1007/s11664-019-07857-5

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  • DOI: https://doi.org/10.1007/s11664-019-07857-5

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