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Title	en Double thermoelectric power factor of a 2D electron system
Creator	en Zhang, Yuqiao en Feng, Bin en Hayashi, Hiroyuki en Chang, Cheng-Ping en Sheu, Yu-Miin en Tanaka, Isao en Ikuhara, Yuichi en Ohta, Hiromichi NRID 1000080372530
Accessrights	open access
Rights	https://creativecommons.org/licenses/by/4.0/ en Creative Commons Attribution 4.0 International
Subject	NDC 549
Description	Abstract en 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.
Publisher	en Nature Publishing Group
Date	Issued2018-06-20
Language	eng
Resource Type	journal article
Version Type	VoR
Identifier	HDL http://hdl.handle.net/2115/71160
Relation	isIdenticalTo DOI https://doi.org/10.1038/s41467-018-04660-4
Journal	PISSN 2041-1723 en Nature communications Volume Number9 Page Start2224
File	fulltext s41467-018-04660-4.pdf 1.09 MB (application/pdf) Issued2018-06-20
Oaidate	2023-07-26