Fabrication and Thermoelectric Properties of Oxide Superlattices with Two-dimensional Electron Gas
Project/Area Number |
18686054
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Research Category |
Grant-in-Aid for Young Scientists (A)
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Allocation Type | Single-year Grants |
Research Field |
Inorganic materials/Physical properties
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Research Institution | Nagoya University |
Principal Investigator |
OHTA Hiromichi Nagoya University, 大学院・工学研究科, 准教授 (80372530)
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Project Period (FY) |
2006 – 2008
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Project Status |
Completed (Fiscal Year 2008)
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Budget Amount *help |
¥30,550,000 (Direct Cost: ¥23,500,000、Indirect Cost: ¥7,050,000)
Fiscal Year 2008: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2007: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2006: ¥26,780,000 (Direct Cost: ¥20,600,000、Indirect Cost: ¥6,180,000)
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Keywords | 熱電変換 / 二次元電子ガス / チタン酸ストロンチウム / 人工超格子 |
Research Abstract |
人工宝石として知られ、毒性がなく、融点が高いSrTiO_3を用いた熱電変換材料を創製した。精密な超薄膜技術により、電子を生成させた厚さ0.4nmの金属SrTiO_3:Nb層と、絶縁性SrTiO_3からなるサンドイッチ構造を作製することで、二次元平面に高濃度の伝導電子(1021cm^<-3>)を溜め込んだ結果、熱起電力が同濃度の電子を生成させたバルクSrTiO_3の約5倍と大きく、熱電変換性能指数ZT(=[熱起電力]×[熱起電力]×[導電率]×[温度]÷[熱伝導率])が既存重金属材料の約2倍になることを見出した。
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Report
(4 results)
Research Products
(93 results)
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[Journal Article]2008
Author(s)
Hiromichi Ohta
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Journal Title
phys. stat. sol. (b) 245
Pages: 2363-2363
Related Report
Peer Reviewed
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[Journal Article]2008
Author(s)
H. Ohta, Y. Mune, K. Koumoto, T. Mizoguchi, and Y. Ikuhara
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Journal Title
Thin Solid Films 516
Pages: 5916-5916
Related Report
Peer Reviewed
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[Journal Article]2007
Author(s)
H. Ohta
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Journal Title
Materials Today 10
Pages: 44-44
Related Report
Peer Reviewed
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[Journal Article] Giant Thermoelectric Seebeck coefficient of a Two-dimensional Electron Gas in SrTiO_32007
Author(s)
H.Ohta, S-W.Kim, Y.Mune, T.Mizoguchi, K.Nomura, S.Ohta, T.Nomura, Y.Nakanishi, Y.Ikuhara, M.Hirano, H.Hosono, K.Koumoto
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Journal Title
Nature Materials 6
Pages: 129-129
Related Report
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[Presentation]2008
Author(s)
太田裕道
Organizer
応用物理学会東海支部第12回基礎セミナー
Place of Presentation
名古屋大学(名古屋)
Year and Date
2008-03-07
Related Report
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[Presentation]2008
Author(s)
Hiromichi Ohta
Organizer
Villa Conference on Complex Oxide Heterostructures
Place of Presentation
Orange Tree Villa, Clermont, FL
Related Report
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[Presentation]2007
Author(s)
Hiromichi Ohta
Organizer
PacRim7
Place of Presentation
Shanghai(China)
Year and Date
2007-11-13
Related Report
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[Presentation]2007
Author(s)
太田裕道
Organizer
第4回日本熱電学会
Place of Presentation
大阪大学(大阪)
Year and Date
2007-08-30
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