Thermopower measurements of single molecules for thermoelectric thermoelectric conversion devices

• Project/Area Number: 15K13673
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Functional solid state chemistry
• Research Institution: Osaka University
• Principal Investigator: TADA HIROKAZU 大阪大学, 基礎工学研究科, 教授 (40216974)
• Co-Investigator(Renkei-kenkyūsha): Ohto Tatshuhiko 大阪大学, 基礎工学研究科, 助教 (90717761) ; Tanaka Shoji 分子科学研究所, 安全衛生管理室, 助教 (20192635)
• Research Collaborator: Lee See Kei ; Ushirokita Hiroaki ; Nobusue Shunpei ; Yamada Ryo
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 単一分子 / 熱起電力 / ゼーベック係数 / 熱伝導度 / ナノコンタクト / 分子エレクトロニクス / 熱電変換

Outline of Final Research Achievements

Thermopower measurement was carried out for single molecule junctions of Au-oligothiophene-Au. The thermopower increased in proportion to the temperature difference between Au electrodes showing the positive Seebeck coefficient. It was found that holes are majority carriers in this junction. The in-plane thermal conductivity of polymer films was measured using an AC calorimetry method. It was found that the in-plane thermal conductivity was twice as high as that measured perpendicular to the plane by the 3 omega method. In order to prevent the over-evaluation of thermoelectric properties, the electric conductivity, Seebeck coefficient, and thermal conductivity of the specimen should be measured in the same direction.

Research Products

• [Int'l Joint Research] Seoul National University(韓国)
• [Int'l Joint Research] Seoul National University(韓国)
• [Journal Article] In-plane thermal conductivity measurement of conjugated polymer films by membrane-based ac calorimetry (2016)
  • Author(s): Hiroaki Ushirokita and Hirokazu Tada
  • Journal Title: Chemistry Letters Volume: 45 Issue: 7 Pages: 735-737
  • DOI: 10.1246/cl.160175
  • NAID: 130005252983
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Large-Sized Single Crystals of Layered Organic-Inorganic Hybrid Perovskite: Growth and Characterization (2017)
  • Author(s): HUONG MAI DUONG THI , Shunpei Nobusue , Hirokazu Tada
  • Organizer: 第64回応用物理学会春季学術講演会
  • Place of Presentation: パシフィコ横浜（神奈川県・横浜市）
  • Year and Date: 2017-03-14
  • Int'l Joint Research
• [Presentation] 層状有機-無機ハイブリッドペロブスカ イトの熱伝導特性 (2017)
  • Author(s): 信末 俊平, Duong Thi Mai Huong, 後北 寛明, 夛田 博一
  • Organizer: 第64回応用物理学会春季学術講演会
  • Place of Presentation: パシフィコ横浜（神奈川県・横浜市）
  • Year and Date: 2017-03-14
  • Int'l Joint Research
• [Presentation] Thermoelectric properties of pyridine and thiophene-based tripodal anchor units molecular junctions (2016)
  • Author(s): See Kei Lee, Yutaka Ie, Kazunari Tanaka, Aya Tashiro, Henrique Rosa Testai, Ryo Yamada, Yoshio Aso, Hirokazu Tada
  • Organizer: International Workshop on Molecular Architectonics
  • Place of Presentation: Shiretoko (Hokkaido, Shari)
  • Year and Date: 2016-08-03
  • Int'l Joint Research
• [Presentation] Recent Progress in Materials Design for Organic Thermoelectric Devices (2016)
  • Author(s): Shunpei Nobusue, Hiroaki Ushirokita, Hirokazu Tada
  • Organizer: 2016 CSOM-Molectronics Summer WORKSHOP
  • Place of Presentation: Seoul (Korea)
  • Year and Date: 2016-06-20
  • Int'l Joint Research
• [Presentation] Thermoelectric properties of single molecules (2016)
  • Author(s): Hirokazu Tada
  • Organizer: Workshop on Computational Nano-Materials Design and Realization for Energy-Saving and Energy-Creation Materials
  • Place of Presentation: Osaka University (Osaka, Toyonaka)
  • Year and Date: 2016-03-25
  • Int'l Joint Research
• [Presentation] 熱起電力測定による単分子接合の電子状態の解明 (2016)
  • Author(s): 山田 亮・Lee Seekei・田中 彰治・夛田 博一
  • Organizer: 日本化学会第９６春季年会
  • Place of Presentation: 同志社大学京田辺キャンパス（京都府・京田辺市）
  • Year and Date: 2016-03-24
• [Presentation] Probing spinterface in single molecular junctions by thermoelectric measurements (2015)
  • Author(s): Ryo Yamada, See Lee, Tatsuhiko Ohto, Hirokazu Tada
  • Organizer: Pacifichem 2015
  • Place of Presentation: Honolulu (USA)
  • Year and Date: 2015-12-15
  • Int'l Joint Research
• [Presentation] 三脚アンカー分子による単分子接合の伝導キャリア制御 (2015)
  • Author(s): Lee See Kei, 家 裕隆, 田中一成, 田代彩, Testai, Henrique Rosa, 山田 亮, 安蘇 芳雄, 夛田 博一
  • Organizer: 表面・界面スペクトロスコピー2015
  • Place of Presentation: 国立女性教育会館（埼玉県・比企郡）
  • Year and Date: 2015-11-27
• [Remarks] 大阪大学基礎工学研究科物質創成専攻未来物質領域夛田研究室
  • URL: http://molectronics.jp
• [Remarks] Tada Laboratory
  • URL: http://molectronics.jp/en/