Proving 200% efficient charge generation via singlet exciton fission

• Project/Area Number: 16K13669
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: The University of Tokushima
• Principal Investigator: Furube Akihiro 徳島大学, 大学院社会産業理工学研究部(理工学域), 教授 (30357933)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 有機太陽電池 / 励起子分裂 / 過渡吸収分光 / 電荷分離 / 有機分子性結晶 / フェムト秒分光 / 反応ダイナミクス / シングレットフィッション / 光物性 / 太陽光発電 / 有機導体 / 高性能レーザー / ナノ材料

Outline of Final Research Achievements

We investigated whether singlet exciton fission process in organic solid, where a triplet excitons pair is generated, can be applied to a solar cell with quantum efficiency of 200% from the elucidation of the primary reaction process. For rubrene single crystals, exciton fission occurs with a time constant of 10 ps. Here, tin oxide nanoparticles were studied as a substitute for fullerene, which is a common electron acceptor. We succeeded in producing a mixed system of microcrystals of rubrene and tin oxide nanoparticles. As a result of transient absorption spectroscopy, singlet fission was observed, but there was no process of charge separation of triplet excitons after that. This is because the diffusion length of triplet excitons is small. Conference presentation was made on this finding. Also, the exciton fission process of other molecular systems was elucidated and the result was published.

Research Products

• [Journal Article] Synthesis, crystal structure, and photophysical properties of 2,9-disubstituted peropyrene derivatives (2017)
  • Author(s): K. Uchida, T. Kubo, D. Yamanaka, A. Furube, H. Matsuzaki, R. Nishii, Y. Sakagami, A. Abulikemu, K. Kamada
  • Journal Title: Can. J. Chem. Volume: - Issue: 4 Pages: 432-444
  • DOI: 10.1139/cjc-2016-0569
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Transient absorption study of singlet excitons in crystalline peropyrene derivatives: examination of singlet fission process (2017)
  • Author(s): Akihiro Furube, Daiki Yamanaka, Shinichiro Yanagiya, Hiroyuki Matsuzaki, Kazuyuki Uchida, Takashi Kubo
  • Organizer: 231th ECS Meeting
  • Invited
• [Presentation] フェムト秒過渡吸収分光法によるヘマタイト光アノードの電荷分離機構の解明 (2017)
  • Author(s): 岡﨑 理宏, 古部 昭広, Chen Yen-Jhih, Chen Liang-Yih
  • Organizer: 光化学討論会
• [Presentation] Singlet exciton fission and interfacial charge transfer in organic crystals revealed by transient absorption spectroscopy: primary process of singlet fission solar cell (2017)
  • Author(s): Akihiro Furube
  • Organizer: SPIE NANOPHOTONICS AUSTRALASIA
  • Invited
• [Presentation] 過渡吸収測定によるペロピレン誘導体結晶におけるシングレットフィッション過程の検討 (2017)
  • Author(s): 山中大樹、柳谷伸一郎、古部昭広、松﨑弘幸、内田一幸、久保孝史
  • Organizer: 応用物理学会春期学術講演会
  • Place of Presentation: パシフィコ横浜（神奈川県横浜市）
• [Presentation] 時間分解分光測定によるペロピレン誘導体結晶におけるシングレットフィッションの検討 (2016)
  • Author(s): 山中大樹、柳谷伸一郎、古部昭広、松﨑弘幸、内田一幸、久保孝史
  • Organizer: 光化学討論会
  • Place of Presentation: 東京大学（東京都目黒区）
• [Presentation] TIME-RESOLVED SPECTROSCOPIC STUDY OF SINGLET EXCITONS IN CRYSTALLINE PEROPYRENE DERIVATIVES: INVESTIGATION OF SINGLET FISSION PROCESS (2016)
  • Author(s): Daiki Yamanaka, Shinichiro Yanagiya, Akihiro Furube, Hiroyuki Matsuzaki, Kazuyuki Uchida, Takashi Kubo
  • Organizer: 2016 International Symposium for Young Chemical Engineers
  • Place of Presentation: 台北（台湾）
  • Int'l Joint Research