Enhancement of the Exciton Coherence Size in Organic Semiconductor by Alkyl Chain Substitution

Shunsuke Tanaka, Kiyoshi Miyata, Toshiki Sugimoto, Kazuya Watanabe, Takafumi Uemura, Jun Takeya, Yoshiyasu Matsumoto

研究成果: Contribution to journalArticle査読

13 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)7941-7948
ページ数8
ジャーナルJournal of Physical Chemistry C
120
15
DOI
出版ステータス出版済み - 5 5 2016
外部発表はい

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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