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タイトル: Double thermoelectric power factor of a 2D electron system
著者: Zhang, Yuqiao
Feng, Bin
Hayashi, Hiroyuki
Chang, Cheng-Ping
Sheu, Yu-Miin
Tanaka, Isao
Ikuhara, Yuichi
Ohta, Hiromichi
著者名の別形: 張, 雨橋
林, 博之
田中, 功
幾原, 雄一
太田, 裕道
キーワード: Electronic properties and materials
Surfaces, interfaces and thin films
Thermoelectric devices and materials
Thermoelectrics
Two-dimensional materials
発行日: 20-Jun-2018
出版者: Springer Nature
誌名: Nature Communications
巻: 9
論文番号: 2224
抄録: 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−xNb x O3|11 unit cell SrTiO3]10—there are two different de Broglie wavelength in the SrTi1−xNb x O3 system. The maximum power factor of the superlattice composed of the longer de Broglie wavelength SrTi1−xNb x O3 exceeded ∼5 mW m−1 K−2, which doubles the value of optimized bulk SrTi1−xNb x O3. The present approach—use of longer de Broglie wavelength—is epoch-making and is fruitful to design good thermoelectric materials showing high power factor.
記述: 電子をギュッと閉じ込めて熱電材料の性能を倍増 --熱電材料を高性能化する理論を実証--. 京都大学プレスリリース. 2018-07-10.
著作権等: © The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
URI: http://hdl.handle.net/2433/232619
DOI(出版社版): 10.1038/s41467-018-04660-4
PubMed ID: 29925840
関連リンク: http://www.kyoto-u.ac.jp/ja/research/research_results/2018/180620_1.html
出現コレクション:学術雑誌掲載論文等

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