Thermal conductivity clarification of parallel plate structured material with nanometer sized period - Toward realization of high ZT thermoelectric materials -
Project/Area Number |
17H01314
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Research Category |
Grant-in-Aid for Scientific Research (A)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Inorganic materials/Physical properties
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Research Institution | Hokkaido University |
Principal Investigator |
Ohta Hiromichi 北海道大学, 電子科学研究所, 教授 (80372530)
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Project Period (FY) |
2017-04-01 – 2021-03-31
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Project Status |
Completed (Fiscal Year 2020)
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Budget Amount *help |
¥45,630,000 (Direct Cost: ¥35,100,000、Indirect Cost: ¥10,530,000)
Fiscal Year 2020: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥32,890,000 (Direct Cost: ¥25,300,000、Indirect Cost: ¥7,590,000)
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Keywords | 熱伝導率 / ナノ周期平行平板構造 / 熱電変換 / 性能指数 / 超格子 / 単結晶薄膜 / 層状コバルト酸化物 / 高ZT熱電材料 |
Outline of Final Research Achievements |
In thermoelectric conversion technology that converts heat into electricity, metal oxides (thermally and chemically stable, harmless) are attractive thermoelectric material candidates, but because of their high thermal conductivity, there is a problem that their efficiency is lower than the conventional thermoelectric materials. In this study, in order to experimentally elucidate the effect of the nanoperiodic parallel plate structure on the thermal conductivity, single crystal thin films of metal oxides having a layered structure were prepared, and the thermal conductivity in the directions orthogonal to and parallel to the layer was precisely measured. 1) InGaO3(ZnO)m: It was found that the thermal conductivity of the nanoperiodic parallel plate structure in the plane perpendicular direction is lower than the thermal conductivity of polycrystals. 2) Layered cobalt oxide thin film: It was found that Ba1/3CoO2 thin film shows the highest room temperature figure of merit (ZT = 0.11).
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Academic Significance and Societal Importance of the Research Achievements |
ナノ周期平行平板構造の面直方向の熱伝導率が、多結晶の熱伝導率よりも低いという、常識を覆す発見は、熱伝導率が低い酸化物を設計するための大きな指針を与えるものである。また、室温熱電変換性能指数(ZT = 0.11)を示すBa1/3CoO2薄膜については、一般に、性能指数ZTは高温になるほど上昇することから,安定で実用的な熱電変換材料の実現が期待され、将来,工場,火力発電所,自動車やコンピュータなどからの廃熱を電気に変えて有効利用する技術に繋がるものである。
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Report
(5 results)
Research Products
(281 results)
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[Journal Article] Low thermal conductivity of SrTiO3-LaTiO3 and SrTiO3-SrNbO3 thermoelectric oxide solid solutions2021
Author(s)
Yuqiao Zhang*, Hai Jun Cho, Kenyu Sugo, Masashi Mikami, Sungmin Woo, Myung-Chul Jung, Yao-Hua Zhuang, Bin Feng, Yu-Miin Sheu*, Woosuck Shin, Woo Seok Choi, Myung Joon Han, Yuichi Ikuhara, and Hiromichi Ohta*
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Journal Title
Journal of the American Ceramic Society
Volume: -
Pages: -
DOI
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Peer Reviewed / Int'l Joint Research
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[Journal Article] Phase Instability amid Dimensional Crossover in Artificial Oxide Crystal2020
Author(s)
Seung Gyo Jeong, Taewon Min, Sungmin Woo, Jiwoong Kim, Yu-Qiao Zhang, Seong Won Cho, Jaeseok Son, Young-Min Kim, Jung Hoon Han, Sungkyun Park, Hu Young Jeong, Hiromichi Ohta, Suyoun Lee, Tae Won Noh, Jaekwang Lee*, Woo Seok Choi*
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Journal Title
Phys. Rev. Lett.
Volume: 124
Pages: 026401-1-6
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Peer Reviewed / Int'l Joint Research
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[Journal Article] Ferroelectric oxide thin film with an out-of-plane electrical conductivity2019
Author(s)
Tingting Yao, Yixiao Jiang, Chunlin Chen*, Xuexi Yan, Ang Tao, Lixin Yang, Chuihong Li, Kenyu Sugo, Hiromichi Ohta, Hengqiang Ye, Yuichi Ikuhara, Xiuliang Ma*
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Journal Title
Nano Lett.
Volume: 20
Pages: 1047-1053
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Peer Reviewed / Int'l Joint Research
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[Journal Article] Formation of environmentally stable hole-doped graphene films with instantaneous and high-density carrier doping via a boron-based oxidant2019
Author(s)
Kaito Kanahashi, Naoki Tanaka, Yoshiaki Shoji, Mina Maruyama, Il Jeon, Kenji Kawahara, Masatou Ishihara, Masataka Hasegawa, Hiromichi Ohta, Hiroki Ago, Yutaka Matsuo, Susumu Okada, Takanori Fukushima, Taishi Takenobu
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Journal Title
npj 2D Materials and Applications
Volume: 3
Pages: 1-7
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Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Thermal conductivity tensor of NbO22019
Author(s)
Hai Jun Cho*, Gowoon Kim, Takaki Onozato, Hyoungjeen Jeen, Hiromichi Ohta
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Journal Title
International Journal of Heat and Mass Transfer
Volume: 137
Pages: 263-267
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Peer Reviewed / Int'l Joint Research
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[Journal Article] Extremely light carrier effective mass in a distorted simple metal oxide2018
Author(s)
Gowoon Kim, Yu-Qiao Zhang, Taewon Min, Hoyoung Suh, Jae Hyuck Jang, Hyeonjun Kong, Joonhyuk Lee, Jaekwang Lee, Tae-Yeol Jeon, Inwon Lee, Jinhyung Cho, Hiromichi Ohta, Hyoungjeen Jeen
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Journal Title
Advanced Electronic Materials
Volume: 5
Pages: 1800504-1-5
DOI
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Peer Reviewed / Int'l Joint Research
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[Journal Article] Directing oxygen vacancy channels in SrFeO2.5 epitaxial thin films2018
Author(s)
Amit Khare, Jaekwang Lee, Jaeseoung Park, Gi-Yeop Kim, Si-Young Choi, Takayoshi Katase, Seulki Roh, Tae Sup Yoo, Jungseek Hwang, Hiromichi Ohta, Junwoo Son, Woo Seok Choi
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Journal Title
ACS Appl. Mater. Interfaces
Volume: 10
Pages: 4831-4837
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Peer Reviewed / Int'l Joint Research
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[Journal Article] Topotactic Metal-Insulator Transition in Epitaxial SrFeOx Thin Films2017
Author(s)
Amit Khare, Dongwon Shin, Taesup Yoo, Minu Kim, Tae Dong Kang, Jaekwang Lee, Seulki Roh, Jungseek Hwang, Sung Wng Kim, Tae Won Noh, Hiromichi Ohta, Woo Seok Choi
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Journal Title
Adv. Mater.
Volume: 29
Pages: 1606566-1-9
DOI
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Peer Reviewed / Int'l Joint Research
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[Presentation] Branching of Electrical and Thermal Conductivities in La- and Nb-substituted SrTiO32020
Author(s)
Y. Zhang, H.J. Cho, K. Sugo, M. Mikami, S. Woo, M.-C. Jung, Y.-H. Zhuang, B. Feng, Y.-M. Sheu, W. Shin, W.S. Choi, M.J. Han, Y. Ikuhara, and H. Ohta
Organizer
Virtual Conference on Thermoelectrics (VCT 2020)
Related Report
Int'l Joint Research
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[Presentation] High and Low Thermal Conductivity Phase Boundary in SrTiO3-SrNbO3 Solid-Solution System2019
Author(s)
Yuqiao Zhang, Hai Jun Cho, Kenyu Sugo, Masashi Mikami, Sungmin Woo, Myung-Chul Jung, Woosuck Shin, Woo Seok Choi, Myung Joon Han, Hiromichi Ohta
Organizer
2019 MRS Fall Meeting & Exhibit, Boston
Related Report
Int'l Joint Research
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[Presentation] Zero contribution of conduction electrons in the thermal conductivity of a metallic conductor2019
Author(s)
Y. Zhang, H.J. Cho, K. Sugo, M. Mikami, S. Woo, M.-C. Jung, Y.H. Zhuang, Y-M. Sheu, W. Shin, W.S. Choi, M.J. Han, H. Ohta
Organizer
The 3rd Workshop on Functional Materials Science
Related Report
Int'l Joint Research
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[Presentation] Orientation dependent physical properties of epitaxial NbO2 thin films2018
Author(s)
Gowoon Kim, Yu-Qiao Zang, Taewon Min, Hoyoung Suh, Jae Hyuck Jang, Hyeonjun Kong, Joonhyuk Lee, Jaekwang Lee, Tae-Yeol Jeon, Inwon Lee, Jinhyung Cho, Hiromichi Ohta, Hyoungjeen Jeen
Organizer
2018 KSP Spring Meeting
Related Report
Int'l Joint Research
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[Presentation] A facile path for electron hopping in NbO22018
Author(s)
G. Kim, Y. Zhang, T. Min, H. Seo, J. Jang, H. Kong, J-H. Lee, J-K. Lee, T.Y. Jeon, I. Lee, J.H. Cho, H. Ohta, H. Jeen
Organizer
The 2nd Workshop on Functional Materials Science, Busan
Related Report
Int'l Joint Research
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[Presentation] Facile path for electron hopping in epitaxial NbO2 thin films2018
Author(s)
Gowoon Kim, Yu-Qiao Zang, Taewon Min, Hoyoung Seo, Jaehyuck Jang, Hyeonjun Kong, Joonhyuk Lee, Jaekwang Lee, Tae-Yeol Jeon, Inwon Lee, JinHyung Cho, Hiromichi Ohta, Hyoungjeen Jeen
Organizer
the International Conference on Electronic Materials and Nanotechnology for Green Environment (ENGE 2018)
Related Report
Int'l Joint Research
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[Presentation] Extremely light carrier effective mass in a distorted simple metal oxide, NbO22018
Author(s)
Gowoon Kim, Yu-Qiao Zhang, Taewon Min, Hoyoung Suh, Jae Hyuck Jang, Hyeonjun Kong, Joonhuyk Lee, Jaekwang Lee, Tae-Yeol Jeon, Inwon Lee, Jinhyung Cho, Hiromichi Ohta, Hyoungjeen Jeen
Organizer
The 19th RIES-HOKUDAI International Symposium 組[So]
Related Report
Int'l Joint Research
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