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Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system

Author

Listed:
  • Yuto Uematsu

    (Osaka University)

  • Takafumi Ishibe

    (Osaka University)

  • Takaaki Mano

    (National Institute for Materials Science)

  • Akihiro Ohtake

    (National Institute for Materials Science)

  • Hideki T. Miyazaki

    (National Institute for Materials Science)

  • Takeshi Kasaya

    (National Institute for Materials Science)

  • Yoshiaki Nakamura

    (Osaka University)

Abstract

Toward drastic enhancement of thermoelectric power factor, quantum confinement effect proposed by Hicks and Dresselhaus has intrigued a lot of researchers. There has been much effort to increase power factor using step-like density-of-states in two-dimensional electron gas (2DEG) system. Here, we pay attention to another effect caused by confining electrons spatially along one-dimensional direction: multiplied 2DEG effect, where multiple discrete subbands contribute to electrical conduction, resulting in high Seebeck coefficient. The power factor of multiple 2DEG in GaAs reaches the ultrahigh value of ~100 μWcm−1 K−2 at 300 K. We evaluate the enhancement rate defined as power factor of 2DEG divided by that of three-dimensional bulk. The experimental enhancement rate relative to the theoretical one of conventional 2DEG reaches anomalously high (~4) in multiple 2DEG compared with those in various conventional 2DEG systems (~1). This proposed methodology for power factor enhancement opens the next era of thermoelectric research.

Suggested Citation

  • Yuto Uematsu & Takafumi Ishibe & Takaaki Mano & Akihiro Ohtake & Hideki T. Miyazaki & Takeshi Kasaya & Yoshiaki Nakamura, 2024. "Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44165-3
    DOI: 10.1038/s41467-023-44165-3
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    References listed on IDEAS

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    1. Allon I. Hochbaum & Renkun Chen & Raul Diaz Delgado & Wenjie Liang & Erik C. Garnett & Mark Najarian & Arun Majumdar & Peidong Yang, 2008. "Enhanced thermoelectric performance of rough silicon nanowires," Nature, Nature, vol. 451(7175), pages 163-167, January.
    2. Yanzhong Pei & Xiaoya Shi & Aaron LaLonde & Heng Wang & Lidong Chen & G. Jeffrey Snyder, 2011. "Convergence of electronic bands for high performance bulk thermoelectrics," Nature, Nature, vol. 473(7345), pages 66-69, May.
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