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Remarkable Dependence of the Final Charge Separation Efficiency on the Donor–Acceptor Interaction in Photoinduced Electron Transfer |
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| Authors: | Dr Tomohiro Higashino Tomoki Yamada Masanori Yamamoto Prof?Dr Akihiro Furube Prof?Dr Nikolai V Tkachenko Taku Miura Prof?Dr Yasuhiro Kobori Dr Ryota Jono Prof?Dr Koichi Yamashita Prof?Dr Hiroshi Imahori |
| Institution: | 1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo‐ku, Kyoto, 615–8510 (Japan);2. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1‐1‐1‐ Umezono, Tsukuba, Ibaraki 305–8568 (Japan);3. Present address: Institute of Technology and Science, Tokushima University, 2‐1, Minamijosanjima‐cho, Tokushima, 770–8506 (Japan);4. Department of Chemistry and Bioengineering, Tampere University of Technology, P.O.Box 541, 33101 Tampere (Finland);5. Department of Chemistry, Graduate School of Science, Kobe University, 1‐1 Rokkoudai‐cho, Nada‐ku, Kobe 657–8501 (Japan);6. PRESTO (Japan) Science and Technology Agency, Kawaguchi, Saitama 332‐0012 (Japan);7. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7‐3‐1, Hongo, Bunkyo‐ku, Tokyo 113–8656 (Japan);8. Institute for Integrated Cell‐Material Sciences (WPI‐iCeMS), Kyoto University, Nishikyo‐ku, Kyoto 615–8510 (Japan) |
| Abstract: | The unprecedented dependence of final charge separation efficiency as a function of donor–acceptor interaction in covalently‐linked molecules with a rectilinear rigid oligo‐p‐xylene bridge has been observed. Optimization of the donor–acceptor electronic coupling remarkably inhibits the undesirable rapid decay of the singlet charge‐separated state to the ground state, yielding the final long‐lived, triplet charge‐separated state with circa 100 % efficiency. This finding is extremely useful for the rational design of artificial photosynthesis and organic photovoltaic cells toward efficient solar energy conversion. |
| Keywords: | charge separation electron transfer electronic coupling exciplexes Marcus theory |