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Search for high-mobility thermoelectric material with super-ionic conductivity and control of lattice disorder

Research Project

Project/Area Number 25620040
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Inorganic chemistry
Research InstitutionThe University of Tokyo

Principal Investigator

ISHIWATA Shintaro  東京大学, 工学(系)研究科(研究院), 准教授 (00525355)

Co-Investigator(Renkei-kenkyūsha) SAKAI Hiswaki  東京大学, 大学院工学系研究科, 助教 (20534598)
Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords熱電変換 / 層状遷移金属カルコゲナイド / ゼーベック効果 / 超イオン伝導 / 半金属 / 層状カルコゲナイド / ドメイン観察
Outline of Final Research Achievements

To search for a high-performance thermoelectric material showing low thermal conductivity as low as a glass in addition to high electronic conductivity, we studied the effect of controlling domain on thermoelectric properties and synthesized new compounds of layered transition-metal chalcogenides. First, we found that a polycrystalline sample of CuAgSe with superionic conductivity shows an enhanced power factor at low temperatures below 200 K by enlarging the size of domains. Second, we examined Nb-doping effect on 1T-MoTe2, which is known as a high-mobility semimetal, and found that the 10%-doped sample shows an improved figure of merit (ZT~0.02) at room temperature and that the 60%-doped sample crystallizes in new 3R polytype without inversion symmetry.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • Research Products

    (12 results)

All 2015 2014 2013 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results,  Acknowledgement Compliant: 1 results) Presentation (8 results) Book (1 results) Remarks (1 results)

  • [Journal Article] Rich structural phase diagram and thermoelectric properties of layered tellurides Mo1-xNbxTe22015

    • Author(s)
      K. Ikeura, H. Sakai, M. S. Bahramy, and S. Ishiwata
    • Journal Title

      APL Materials

      Volume: 3 Issue: 4

    • DOI

      10.1063/1.4913967

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Insulator-to-Superconductor Transition upon Electron Doping in a BiS2-Based Superconductor Sr1-xLaxFBiS22014

    • Author(s)
      H. Sakai, D. Kotajima, K. Saito, H. Wadati, Y. Wakisaka, M. Mizumaki, K. Nitta, Y. Tokura, S. Ishiwata
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 83 Issue: 1 Pages: 014709-014709

    • DOI

      10.7566/jpsj.83.014709

    • NAID

      210000132926

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Presentation] 遷移金属ダイカルコゲナイドMo1-xNbxTe2の多彩な構造相図と熱電特性2015

    • Author(s)
      池浦晃至,酒井英明,十倉好紀,石渡晋太郎
    • Organizer
      日本物理学会第70会年次大会
    • Place of Presentation
      東京、早稲田大学
    • Year and Date
      2015-03-21 – 2015-03-25
    • Related Report
      2014 Annual Research Report
  • [Presentation] 多層ディラック電子系EuMnBi2におけるEuスピンと強く結合した磁気輸送現象2015

    • Author(s)
      増田英俊,酒井英明,三宅厚志,徳永将史,十倉好紀,石渡晋太郎
    • Organizer
      日本物理学会第70会年次大会
    • Place of Presentation
      東京、早稲田大学
    • Year and Date
      2015-03-21 – 2015-03-25
    • Related Report
      2014 Annual Research Report
  • [Presentation] 遷移金属のジグザグ鎖構造を有する層状カルコゲナイドMTe2 (M=V, Nb, Ta)の化学置換効果2015

    • Author(s)
      上谷学,酒井英明,十倉好紀,石渡晋太郎
    • Organizer
      日本物理学会第70会年次大会
    • Place of Presentation
      東京、早稲田大学
    • Year and Date
      2015-03-21 – 2015-03-25
    • Related Report
      2014 Annual Research Report
  • [Presentation] ビスマス正方格子を持つ多層ディラック電子系(Sr, Ba)MBi2(M=Mn, Zn)における量子輸送現象2014

    • Author(s)
      増田英俊,酒井英明,E. A. Yelland,J. A. N. Bruin,I. Sheikin,十倉好紀, 石渡晋太郎
    • Organizer
      日本物理学会2014年秋季大会
    • Place of Presentation
      愛知、中部大学
    • Year and Date
      2014-09-07 – 2014-09-10
    • Related Report
      2014 Annual Research Report
  • [Presentation] Fermi Level Tuning of 3D Topological Insulator Bi2Te3 by Electrochemical Cu-Intercalation2014

    • Author(s)
      K. Saito, H. Sakai, Y. Tokura, S. Ishiwata
    • Organizer
      FIRST International Symposium on “Topological Quantum Technology”
    • Place of Presentation
      東京都、東京大学
    • Related Report
      2013 Research-status Report
  • [Presentation] トポロジカル絶縁体における電気化学的銅インターカレーションと化学ポテンシャル制御2014

    • Author(s)
      齋藤公佑,酒井英明,十倉好紀,石渡晋太郎
    • Organizer
      日本物理学会 第69回年次大会
    • Place of Presentation
      神奈川県、東海大学
    • Related Report
      2013 Research-status Report
  • [Presentation] 高移動度半金属β-CuAgSeの熱電特性2013

    • Author(s)
      石渡晋太郎,塩見雄毅,J. S. Lee,M. S. Bahramy,鈴木健士,打田正輝,有田亮太郎, 田口康二郎,十倉好紀
    • Organizer
      第十回日本熱電学会学術講演会(TSJ2013)
    • Place of Presentation
      愛知県、名古屋大学
    • Related Report
      2013 Research-status Report
  • [Presentation] Fermi level tuning of layered pnictogen chalcogenides by electrochemical Cu-intercalation2013

    • Author(s)
      K. Saito, H. Sakai, Y. Tokura, S. Ishiwata
    • Organizer
      FIRST-QS2C WS on "Emergent Phenomena of Correlated Materials
    • Place of Presentation
      東京都、品川インターシティーホール
    • Related Report
      2013 Research-status Report
  • [Book] Electronic Journal 別冊 2015 熱電変換材料&デバイス技術大全2014

    • Author(s)
      石渡晋太郎他
    • Total Pages
      108
    • Publisher
      電子ジャーナル
    • Related Report
      2013 Research-status Report
  • [Remarks] 石渡研究室ホームページ

    • URL

      http://www.qpec.t.u-tokyo.ac.jp/ishiwata_lab/publication.html

    • Related Report
      2014 Annual Research Report

URL: 

Published: 2014-07-25   Modified: 2019-07-29  

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