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

Yuto Uematsu, Takafumi Ishibe, Takaaki Mano, Akihiro Ohtake, Hideki T. Miyazaki, Takeshi Kasaya and Yoshiaki Nakamura ()
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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

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-023-44165-3

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