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Elucidation of correlation of heat and charge transports in molecular materials based on the phonon

Research Project

Project/Area Number 20K15353
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 35030:Organic functional materials-related
Research InstitutionMaizuru National College of Technology

Principal Investigator

Kojima Hirotaka  舞鶴工業高等専門学校, その他部局等, 准教授 (70713634)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords分子動力学計算 / 非平衡計算 / 熱輸送 / フォノン解析 / 有機熱電材料 / 電荷輸送
Outline of Research at the Start

近年、研究が進められている有機熱電変換材料において、分子振動すなわちフォノンが熱伝導率などの熱的特性だけでなく、ゼーベック係数などの熱電特性にも重要な役割を果たしている可能性が示唆される。本研究では、量子化学計算などの静的な解析に加えて、フォノンに着目した動的な解析について、種々の計算化学的手法を組み合わせて実施し、フォノンの群速度や緩和時間等の解析により、熱伝導や電気伝導に寄与するフォノンのみを抽出し、分子ごとにその特性と分子構造とを照らし合わせることで、構造物性相関を得る。最終的には、分子構造の階層からフォノンエンジニアリングを指向した、新たな熱電材料の設計指針を得る計画である。

Outline of Final Research Achievements

In organic thermoelectric materials, which have been investigated in recent years, quantum chemical calculations and molecular vibration analysis were carried out on molecular vibrations and phonons that are important for thermal and thermoelectric properties. In order to identify phonons that contribute to thermal and electrical conduction and the structure-property relationship, non-equilibrium molecular dynamics calculations were performed, and the heat transmittion inside the materials was observed by applying temperature differences to organic materials and composite materials modeled on a computer. Some preferable results such as temperature distribution including thermal conductivity estimated by the amount of heat flowing in and out of the material and parameters for evaluating the thermal properties were obtained by analyzing the trajectory.

Academic Significance and Societal Importance of the Research Achievements

次世代のエネルギー材料である熱電材料などとして期待される一方で,有機物における熱的性質や電気的性質との関係性などはこれまで十分に理解されていなかった。そこで複数の化学計算の手法を駆使し,熱や電気の伝導に関わる分子の振動についての解析を行った。コンピュータ上に分子構造モデルを作成し,モデルに温度差を印加しながら計算機シミュレーションを行うことで,分子の振動の解析やモデル内の温度分布や熱の伝わり方を観測し,流出入する熱量を基にして熱の伝導性を見積もるなど,熱電材料の性質の評価において有益ないくつかの結果が得られた。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (10 results)

All 2024 2023 2022 2021 2020

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Giant Seebeck effect over 0.1?V K<sup>?1</sup> ? is this an intrinsic phenomenon in organic semiconductors?2024

    • Author(s)
      Nakamura Masakazu、Kojima Hirotaka、Abe Ryo、Cho Yongyoon、Hayashi Shotaro、Hiramoto Masahiro
    • Journal Title

      Faraday Discussions

      Volume: 250 Pages: 361-376

    • DOI

      10.1039/d3fd00127j

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Giant seebeck effect in an undoped single crystal of 2,5,8-triphenylbenzo[1,2-<i>b</i>:3,4-<i>b</i>':5,6-<i>b</i>'']trifuran2023

    • Author(s)
      Okayama Katsunari、Kojima Hirotaka、Kawauchi Toshiki、Yamagishi Masakazu、Nakamura Masakazu、Tsuji Hayato
    • Journal Title

      Chemistry Letters

      Volume: 53 Issue: 2

    • DOI

      10.1093/chemle/upad054

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Early Stage Growth Process of Dinaphtho[2,3‐b:2',3'‐f]thieno[3,2‐b]thiophene (DNTT) Thin Film2023

    • Author(s)
      Hiroshiba Nobuya、Kawano Yuta、Ongko Richard、Matsubara Ryosuke、Kubono Atsushi、Kojima Hirotaka、Koike Kazuto
    • Journal Title

      physica status solidi (a)

      Volume: 220 Issue: 24 Pages: 2300252-2300252

    • DOI

      10.1002/pssa.202300252

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Broadband infrared absorption spectroscopy of low-frequency inter-molecular vibrations in crystalline poly(L-lactide)2023

    • Author(s)
      Hiroshiba Nobuya、Akiraka Mitsuru、Kojima Hirotaka、Ohnishi Satoshi、Ebata Atsushi、Tsuji Hideto、Tanaka Saburo、Koike Kazuto、Ariyoshi Seiichiro
    • Journal Title

      Physica B: Condensed Matter

      Volume: 649 Pages: 414488-414488

    • DOI

      10.1016/j.physb.2022.414488

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evaluating Computational Shortcuts in Supercell-Based Phonon Calculations of Molecular Crystals: The Instructive Case of Naphthalene2020

    • Author(s)
      Kamencek Tomas、Wieser Sandro、Kojima Hirotaka、Bedoya-Martinez Natalia、Durholt Johannes P.、Schmid Rochus、Zojer Egbert
    • Journal Title

      Journal of Chemical Theory and Computation

      Volume: 16 Issue: 4 Pages: 2716-2735

    • DOI

      10.1021/acs.jctc.0c00119

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] ジナフトチエノチオフェン(DNTT)薄膜の成長過程と構造評価2023

    • Author(s)
      廣芝伸哉,河野裕太,オンコリチャード,小池一歩,松原亮介,久保野敦史,小島広孝
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] 計算化学的にみた有機機能分子の熱輸送・電荷輸送2022

    • Author(s)
      小島広孝
    • Organizer
      第2回分子エレクトロニクス若手研究会
    • Related Report
      2022 Research-status Report
  • [Presentation] 有機半導体が示す奇異の熱電特性の解明を目指して:振電相互作用に関する計算化学的考察2021

    • Author(s)
      小島広孝
    • Organizer
      電気学会電子材料研究会「フレキシブル素子応用に向けた新規薄膜電子材料の合成と評価」
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Evaluating Computational Shortcuts in Supercell-Based Phonon Calculations of Molecular Crystals: The Instructive Case of Naphthalene2021

    • Author(s)
      Tomas Kamencek, Sandro Wieser, Hirotaka Kojima, Natalia Bedoya-Martinez, Johannes P. Durholt, Rochus Schmid, Egbert Zojer
    • Organizer
      APS March Meeting 2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] π共役曲面をもつジベンゾクリセンにおける巨大ゼーベック効果2020

    • Author(s)
      川内暁貴,小嶋晃平,阿部竜,小島広孝,辨天宏明,辻 勇人,大井綾子,山岸正和,中村雅一
    • Organizer
      第81回応用物理学会秋季学術講演会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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