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Studies on nonlocal excited-state dynamics in semiconductors via novel computational-chemistry techniques

Research Project

Project/Area Number 21K14591
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 32010:Fundamental physical chemistry-related
Research InstitutionKyoto University (2023)
Waseda University (2021-2022)

Principal Investigator

Uratani Hiroki  京都大学, 工学研究科, 特定助教 (50897296)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords励起状態 / 半導体 / ダイナミクス / 量子化学 / 計算化学
Outline of Research at the Start

励起状態の物質のダイナミクスは基礎応用両面から重要な対象である。半導体材料等においては、励起に伴う電子状態変化が数ナノメートル程度の空間的範囲にわたって広がる非局所的励起状態がしばしばみられる。
励起状態の計算化学的シミュレーションにおいては、計算に要する時間が系の大きさに対して急激に増大するという性質のため、非局所的励起状態を扱うことは困難であった。
本研究では、系の大きさに対する計算時間の増大を抑えた励起状態ダイナミクス計算手法を開発し、非局所的励起状態ダイナミクスのシミュレーションを現実的な時間で実行可能とすることを目指す。また、当該手法を半導体の動作機構解明や材料設計に応用する。

Outline of Final Research Achievements

Detailed analyses of photoexcited-state dynamics of chemical species such as molecules and solids are important from both fundamental and practical points of view. Quantum-chemitry-based computer simulations are powerful tools, but their computational cost has limited their applicability. In this study, we propose a novel approach called patchwork approximation, which reduces the computational cost by using the spatial locality of electronic hamiltonian. The proposed approach enabled computer simulations of photoexcited-state dynamics of large systems withing a reasonable computational cost. We applied the proposed approach to organic solar cells to analyze the detail of the charge separation process, which generates the plus and minus charges from the photoexcited state.

Academic Significance and Societal Importance of the Research Achievements

太陽電池や光触媒に代表される光エネルギー利用は人類にとって重要な課題であるものの、エネルギーの利用効率をはじめ、解決すべき課題は多い。これらの課題を解決するには、光照射下における物質の振舞いの詳細な観察と理解に基づく、合理的な物質設計が必要不可欠である。本研究により、実際の太陽電池や光触媒等に近いモデルを用いた計算機シミュレーションが現実的な時間で実行できるようになった。これを応用することで、光エネルギーを電力や化学エネルギーに変換する過程を、これまで以上にミクロな視点で理解することが可能となる。これにより、効率的な光エネルギー利用に向けた物質設計の指針を提供できるものと期待される。

Report

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

    (15 results)

All 2024 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (11 results) (of which Int'l Joint Research: 5 results,  Invited: 5 results)

  • [Journal Article] Neutral-to-ionic photoinduced phase transition of tetrathiafulvalene-p-chloranil by electronic and vibrational excitation: A real-time nuclear-electronic dynamics simulation study2023

    • Author(s)
      Hanada Tatsuki、Uratani Hiroki、Nakai Hiromi
    • Journal Title

      The Journal of Chemical Physics

      Volume: 159 Issue: 5 Pages: 054101-054101

    • DOI

      10.1063/5.0159424

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Born-Oppenheimer molecular dynamics study on collective protein dynamics invoked by ultrafast photoisomerization of retinal chromophore in bacteriorhodopsin2023

    • Author(s)
      Nakai Hiromi、Uratani Hiroki、Morioka Toshiki、Ono Junichi
    • Journal Title

      Chemical Physics Letters

      Volume: 830 Pages: 140818-140818

    • DOI

      10.1016/j.cplett.2023.140818

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nanoscale and Real-Time Nuclear-Electronic Dynamics Simulation Study of Charge Transfer at the Donor-Acceptor Interface in Organic Photovoltaics2023

    • Author(s)
      Hiroki Uratani and Hiromi Nakai
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 14 Issue: 9 Pages: 2292-2300

    • DOI

      10.1021/acs.jpclett.2c03808

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Scalable Ehrenfest Molecular Dynamics Exploiting the Locality of Density-Functional Tight-Binding Hamiltonian2021

    • Author(s)
      Hiroki Uratani and Hiromi Nakai
    • Journal Title

      The Journal of Chemical Theory and Computation

      Volume: 17 Issue: 12 Pages: 7384-7396

    • DOI

      10.1021/acs.jctc.1c00950

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] 動的エキシトン観察手段としての実時間シミュレーション:有機太陽電池における電荷分離過程を例に2024

    • Author(s)
      浦谷 浩輝
    • Organizer
      日本化学会春季年会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 有機薄膜太陽電池におけるエキシトン解離過程の実時間シミュレーションと可視化2024

    • Author(s)
      浦谷 浩輝
    • Organizer
      ISSPワークショップ「デバイス活用で臨む有機伝導体の未来」
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Kinetics of thermally activated delayed fluorescence in amorphous aggregates: effects of structural disorder2023

    • Author(s)
      Hiroki Uratani, Katsuyuki Shizu, and Hironori Kaji
    • Organizer
      TACC2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 有機薄膜太陽電池におけるエキシトン解離過程の非断熱量子分子動力学シミュレーション2023

    • Author(s)
      浦谷 浩輝
    • Organizer
      光化学討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Development of a nanoscale excited-state nuclear-electronic dynamics simulation method and application to charge transfer in organic solar cells2023

    • Author(s)
      Hiroki Uratani and Hiromi Nakai
    • Organizer
      The Asia Pacific Association of Theoretical and Computational Chemistry (APATCC-10)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Simulating Dynamic Excitons Via Quantum Molecular Dynamics: A Case Study in Lead Halide Perovskites2022

    • Author(s)
      Hiroki Uratani
    • Organizer
      241st Electrochemical Society (ECS) Meeting
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Reduced-scaling nonadiabatic molecular dynamics techniques in the framework of density-functional tight binding2022

    • Author(s)
      Hiroki Uratani and Hiromi Nakai
    • Organizer
      World Association of Theoretical and Computational Chemists (WATOC) 2020
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Toward excited-state molecular dynamics analyses of metal oxide photocatalysts: computational method developments and applications2022

    • Author(s)
      Hiroki Uratani
    • Organizer
      分子科学研究所研究会「金属酸化物:表面と薄膜の構造化学」
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 非局在化した励起状態を扱えるスケーラブルなEhrenfest動力学手法の開発2022

    • Author(s)
      浦谷 浩輝、中井 浩巳
    • Organizer
      第24回理論化学討論会
    • Related Report
      2022 Research-status Report
  • [Presentation] 分割統治型励起状態計算に基づく非断熱分子動力学法:凝縮系における無輻射失活過程への展開2021

    • Author(s)
      浦谷 浩輝, 森岡 俊貴, 吉川 武司, 中井 浩巳
    • Organizer
      第23回理論化学討論会
    • Related Report
      2021 Research-status Report
  • [Presentation] Large-scale excited-state nonadiabatic molecular dynamics simulations with divide-and-conquer approach2021

    • Author(s)
      Hiroki Uratani, Toshiki Morioka, Takeshi Yoshikawa, and Hiromi Nakai
    • Organizer
      第36回化学反応討論会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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