Dependence of exciton diffusion length on crystalline order in conjugated polymers

Myungsun Sim, Jisoo Shin, Chiyeoung Shim, Min Kim, Sae Byeok Jo, Joo Hyun Kim, Kilwon Cho

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)


Exciton diffusion in organic semiconductors is crucial to the performance of organic solar cells. Here, we measured the exciton diffusion length in poly(3-hexylthiophene) (P3HT) as a function of the crystalline order using spectrally resolved photoluminescence quenching (SR-PLQ) techniques. The crystalline order in the P3HT films, characterized according to the mean crystal size and normalized crystallinity, was varied by changes in thermal treatment temperatures. The exciton diffusion length increased from 3 to 7 nm as the mean crystal size increased more than twice and the crystallinity increased by a factor of 6. A higher crystalline order improved the spectral overlap and reduced the distance between chromophores, enhancing Förster-mediated exciton diffusion. The higher crystalline order also lengthened the conjugated segments and reduced the energetic disorder, producing favorable condition for exciton hopping.

Original languageEnglish
Pages (from-to)760-766
Number of pages7
JournalJournal of Physical Chemistry C
Issue number2
Publication statusPublished - 2014 Jan 16
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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