Band-shape engineering of thermoelectric materials for high thermoelectric efficiency
| Project/Area Number |
17K14108
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Applied materials
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| Research Institution | Osaka University |
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Principal Investigator |
Usui Hidetomo 大阪大学, 理学研究科, 招へい研究員 (10722902)
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | 熱電効果 / 第一原理計算 / バンド構造 / 物性理論 / 再生可能エネルギー / 廃熱利用 |
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| Outline of Final Research Achievements |
The thermoelectric effect is a direct conversion of heat to electricity or vice versa. In this study, we instigated new thermoelectric materials by means of band-shape engineering, which means that shape of electronic band structures is modified by substituting constituent elements of compounds in order to enhance thermoelectric efficiency. We found that LaOAsSe2, in which As and Se are hypothetically substituted with Bi and S of LaOBiS2, can exhibit large thermoelectric performance with the dimensionless figure of merit ZT > 2.
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| Academic Significance and Societal Importance of the Research Achievements |
熱電効果の性能向上を目指した研究で、エネルギーバンドと呼ばれる電子状態を示す構造の形状を変化させることで高性能化を目指すという研究はこれまでほとんどなかった。本研究では、元素置換によりバンド構造の形状を制御できることを示し、仮想物質ではあるが、大きな熱電性能を生み出しうる物質を理論的に発見することが出来た。本研究により熱電物質開発の新しい指針を提案できたことから、既存の指針と組み合わせることで高性能物質開発の幅が広がることが期待される。
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Report
(3 results)
Research Products
(22 results)
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[Journal Article] Retreat from Stress: Rattling in a Planar Coordination2018
Author(s)
Koichiro Suekuni, Chul Ho Lee, Hiromi I. Tanaka, Eiji Nishibori, Atsushi Nakamura, Hidetaka Kasai, Hidetomo Usui, Masayuki Ochi, Takumi Hasegawa, Mitsutaka Nakamura, Seiko Ohira‐Kawamura, Tatsuya Kikuchi, Koji Kaneko, Hirotaka Nishiate, Katsuaki Hashikuni, Yasufumi Kosaka, Kazuhiko Kuroki, Toshiro Takabatake, 他1名
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Journal Title
Advanced Materials
Volume: 30
Issue: 13
Pages: 1706230-1706230
DOI
Related Report
Peer Reviewed
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[Journal Article] Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe2017
Author(s)
Takanobu Nagayama, Kensei Terashima, Takanori Wakita, Hirokazu Fujiwara, Tetsushi Fukura, Yuko Yano, Kanta Ono, Hiroshi Kumigashira, Osamu Ogiso, Aichi Yamashita, Yoshihiko Takano, Hitoshi Mori, Hidetomo Usui, Masayuki Ochi, Kazuhiko Kuroki, Yuji Muraoka, Takayoshi Yokoya
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Journal Title
Japanese Journal of Applied Physics
Volume: 57
Issue: 1
Pages: 010301-010301
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research
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