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Double thermoelectric power factor of a 2D electron system

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Title: Double thermoelectric power factor of a 2D electron system
Authors: Zhang, Yuqiao Browse this author
Feng, Bin Browse this author
Hayashi, Hiroyuki Browse this author
Chang, Cheng-Ping Browse this author
Sheu, Yu-Miin Browse this author
Tanaka, Isao Browse this author
Ikuhara, Yuichi Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Issue Date: 20-Jun-2018
Publisher: Nature Publishing Group
Journal Title: Nature communications
Volume: 9
Start Page: 2224
Publisher DOI: 10.1038/s41467-018-04660-4
Abstract: Two-dimensional electron systems have attracted attention as thermoelectric materials, which can directly convert waste heat into electricity. It has been theoretically predicted that thermoelectric power factor can be largely enhanced when the two-dimensional electron layer is far narrower than the de Broglie wavelength. Although many studies have been made, the effectiveness has not been experimentally clarified thus far. Here we experimentally clarify that an enhanced two-dimensionality is efficient to enhance thermoelectric power factor. We fabricated superlattices of [N unit cell SrTi1-xNbxO3 vertical bar 11 unit cell SrTiO3](10)-there are two different de Broglie wavelength in the SrTi1-xNbxO3 system. The maximum power factor of the superlattice composed of the longer de Broglie wavelength SrTi1-xNbxO3 exceeded similar to 5 mWm(-1) K-2, which doubles the value of optimized bulk SrTi1- xNbxO3. The present approach-use of longer de Broglie wavelength-is epoch-making and is fruitful to design good thermoelectric materials showing high power factor.
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 太田 裕道

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