論文

査読有り
2016年5月5日

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

Journal of Physical Chemistry C
  • Shunsuke Tanaka
  • ,
  • Kiyoshi Miyata
  • ,
  • Toshiki Sugimoto
  • ,
  • Kazuya Watanabe
  • ,
  • Takafumi Uemura
  • ,
  • Jun Takeya
  • ,
  • Yoshiyasu Matsumoto

120
15
開始ページ
7941
終了ページ
7948
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/acs.jpcc.5b12686

© 2016 American Chemical Society. 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.

Web of Science ® 被引用回数 : 13

リンク情報
DOI
https://doi.org/10.1021/acs.jpcc.5b12686
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000374811100005&DestApp=WOS_CPL
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84966297128&origin=inward
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84966297128&origin=inward
ID情報
  • DOI : 10.1021/acs.jpcc.5b12686
  • ISSN : 1932-7447
  • eISSN : 1932-7455
  • SCOPUS ID : 84966297128
  • Web of Science ID : WOS:000374811100005

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