Enhancement of the Exciton Coherence Size in Organic Semiconductor by Alkyl Chain Substitution
Photophysical properties of molecular aggregates are largely determined by exciton coherence size: a spatial extension of exciton delocalization. Increase in exciton coherence size can lead to fast energy transport as well as efficient charge separation. Here, we demonstrate that introducing alkyl c...
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| Published in: | Journal of physical chemistry. C Vol. 120; no. 15; pp. 7941 - 7948 |
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| Main Authors: | , , , , , , |
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American Chemical Society
21-04-2016
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| Abstract | Photophysical properties of molecular aggregates are largely determined by exciton coherence size: a spatial extension of exciton delocalization. Increase in exciton coherence size can lead to fast energy transport as well as efficient charge separation. Here, we demonstrate that introducing alkyl chains to organic molecules can enhance the exciton coherence size significantly. Focusing on the thin films of excellent hole transport materials, dinaphtho[2,3-b:2,3-f]thieno[3,2-b]thiophene (DNTT) and its alkyl-substituted derivative, we analyze the steady-state and picosecond time-resolved photoluminescence spectra of the films to estimate exciton coherence sizes. The alkyl substitution enhances the coherence size by a factor of 2–3, indicating that a long-range ordering in the molecular aggregates is achieved with the additional van der Waals interaction between saturated alkyl chains. The coherence sizes of both the films decrease with increasing temperature owing to thermal populations within the vibronic exciton manifolds. |
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| AbstractList | Photophysical properties of molecular aggregates are largely determined by exciton coherence size: a spatial extension of exciton delocalization. Increase in exciton coherence size can lead to fast energy transport as well as efficient charge separation. Here, we demonstrate that introducing alkyl chains to organic molecules can enhance the exciton coherence size significantly. Focusing on the thin films of excellent hole transport materials, dinaphtho[2,3-b:2,3-f]thieno[3,2-b]thiophene (DNTT) and its alkyl-substituted derivative, we analyze the steady-state and picosecond time-resolved photoluminescence spectra of the films to estimate exciton coherence sizes. The alkyl substitution enhances the coherence size by a factor of 2–3, indicating that a long-range ordering in the molecular aggregates is achieved with the additional van der Waals interaction between saturated alkyl chains. The coherence sizes of both the films decrease with increasing temperature owing to thermal populations within the vibronic exciton manifolds. |
| Author | Watanabe, Kazuya Takeya, Jun Miyata, Kiyoshi Uemura, Takafumi Tanaka, Shunsuke Sugimoto, Toshiki Matsumoto, Yoshiyasu |
| AuthorAffiliation | Kyoto University Department of Chemistry, Graduate School of Science The University of Tokyo Department of Advanced Materials Science, Graduate School of Frontier Sciences |
| AuthorAffiliation_xml | – name: Kyoto University – name: The University of Tokyo – name: Department of Chemistry, Graduate School of Science – name: Department of Advanced Materials Science, Graduate School of Frontier Sciences |
| Author_xml | – sequence: 1 givenname: Shunsuke surname: Tanaka fullname: Tanaka, Shunsuke – sequence: 2 givenname: Kiyoshi surname: Miyata fullname: Miyata, Kiyoshi – sequence: 3 givenname: Toshiki surname: Sugimoto fullname: Sugimoto, Toshiki – sequence: 4 givenname: Kazuya surname: Watanabe fullname: Watanabe, Kazuya email: kw@kuchem.kyoto-u.ac.jp – sequence: 5 givenname: Takafumi surname: Uemura fullname: Uemura, Takafumi – sequence: 6 givenname: Jun surname: Takeya fullname: Takeya, Jun – sequence: 7 givenname: Yoshiyasu surname: Matsumoto fullname: Matsumoto, Yoshiyasu email: matsumoto@kuchem.kyoto-u.ac.jp |
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| Title | Enhancement of the Exciton Coherence Size in Organic Semiconductor by Alkyl Chain Substitution |
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