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First principles simulation study on dissociation process between electron and hole in organic photocell

Research Project

Project/Area Number 15K05403
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Physical chemistry
Research InstitutionKobe University (2018)
Institute of Physical and Chemical Research (2015-2017)

Principal Investigator

Shimazaki Tomomi  神戸大学, 科学技術イノベーション研究科, 特命講師 (40551544)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords有機薄膜太陽電池 / 励起子分離 / hot CT state / デバイスシミュレーション / エネルギー変換効率 / バルクヘテロジャンクション / 励起子解離 / メゾスコピック / 電化分離過程 / 変換効率 / シミュレーション / 第一原理計算 / バンド構造 / バンドオフセット / 励起子分離過程
Outline of Final Research Achievements

Organic devices based on blends of conjugated polymers and fullerene derivative have been gathering much attention as promising photovoltaic applications, because of their low production costs, thin and light structures, flexibilities, designs, and so on. However, the power conversion efficiency of organic photocells still remains low compared with inorganic devices. In order to improve their performance, we need to more deeply investigate the mechanism to generate electric currents from photons. For that purpose, we studied the theoretical method to calculate the charge separation process with the hot CT state effect. We integrate the CT state mechanism into the diode model, and calculate several device properties of organic photocell device, such as short circuit current, open circuit voltage, and power conversion efficiency. Our study showed that the hot CT state gives strong influences on the device performance.

Academic Significance and Societal Importance of the Research Achievements

本研究プロジェクトでは、hot state を扱うことができる励起子分離過程の理論的手法を開発した。この手法に基づいたシミュレーションにより、有機薄膜太陽電池中で励起子が効率よく解離するには、アクセプター領域のデバイスの次元性とバンドオフセットが重要な働きをしていることが判明した。また、励起子分離過程に加えて、光吸収過程や励起子拡散過程も合わせて考慮することが出来る方法論を構築し、有機薄膜太陽電池デバイス全体のシミュレータを実施した。このようなシミュレーションにより有機薄膜太陽電池のデバイス動作が明らかとなった。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (8 results)

All 2018 2017 2016 2015

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results,  Acknowledgement Compliant: 3 results) Presentation (1 results) (of which Invited: 1 results)

  • [Journal Article] Theoretical study on mesoscopic-size impurity effects in the charge separation process of organic photocells2018

    • Author(s)
      Shimazaki Tomomi、Tashiro Motomichi、Nakajima Takahito
    • Journal Title

      Physical Chemistry Chemical Physics

      Volume: 20 Issue: 21 Pages: 14846-14854

    • DOI

      10.1039/c7cp08125a

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Theoretical Study on Hot Charge-Transfer States and Dimensional Effects of Organic Photocells based on the Ideal Diode Model2017

    • Author(s)
      T. Shimazaki and T. Nakajima
    • Journal Title

      Phys. Chem. Chem. Phys

      Volume: 19 Issue: 19 Pages: 12517-12526

    • DOI

      10.1039/c7cp01455d

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Group molecular orbital approach to solve the Huzinaga subsystem self-consistent- field equations2017

    • Author(s)
      T. Shimazaki, K. Kitaura, D. G. Fedorov, and T. Nakajima
    • Journal Title

      J. Chem. Phys

      Volume: 146 Issue: 8 Pages: 084109-084109

    • DOI

      10.1063/1.4976646

    • Related Report
      2017 Research-status Report 2016 Research-status Report
    • Peer Reviewed
  • [Journal Article] PubChemQC Project: A Large-Scale First-Principles Electronic Structure Database for Data-Driven Chemistry2017

    • Author(s)
      M. Nakata and T. Shimazaki
    • Journal Title

      J. Chem. Inf. Model

      Volume: 57 Issue: 6 Pages: 1300-1308

    • DOI

      10.1021/acs.jcim.7b00083

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Theoretical study on the cooperative exciton dissociation process based on dimensional and hot charge-transfer state effects in an organic photocell2016

    • Author(s)
      T. Shimazaki and T. Nakajima
    • Journal Title

      J. Chem. Phys.

      Volume: 144 Issue: 23 Pages: 234-234

    • DOI

      10.1063/1.4953905

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Application of the dielectric-dependent screened exchange potential approach to organic photocell materials2016

    • Author(s)
      T. Shimazaki and T. Nakajima
    • Journal Title

      Phys. Chem. Chem. Phys.

      Volume: 18 Issue: 39 Pages: 27554-27554

    • DOI

      10.1039/c6cp04863c

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Gaussian-based range-separation approach on Hartree Fock exchange interaction and second-order perturbation theory2015

    • Author(s)
      Tomomi Shimazaki and Takahito Nakajima
    • Journal Title

      Chemical Physics Letters

      Volume: 634 Pages: 83-87

    • DOI

      10.1016/j.cplett.2015.12.069

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Theoretical study of exciton dissociation through hot charge transfer states in organic polymer photocell2016

    • Author(s)
      Tomomi Shimazaki and Takahiato Nakajima
    • Organizer
      EMM meeting on Polymer
    • Place of Presentation
      Hong-Kong
    • Year and Date
      2016-01-12
    • Related Report
      2015 Research-status Report
    • Invited

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Published: 2015-04-16   Modified: 2020-03-30  

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