Effect of thermal annealing on exciton diffusion in a diketopyrrolopyrrole derivative

Oleksandr V. Mikhnenko, Jason Lin, Ying Shu, John E. Anthony, Paul W.M. Blom, Thuc Quyen Nguyen, Maria Antonietta Loi

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

We show that the method we have developed for measuring the singlet exciton diffusion length in blends with [6,6]-phenyl-C 61-butyric acid methyl ester (PCBM) can be applied not only to polymeric materials, but also to small molecule organic semiconductors. Small organic molecules have a large potential for molecular re-organization upon thermal annealing. Here we show that the exciton diffusion length is decreased upon annealing from 9 to 3 nm in a thin film of a diketopyrrolopyrrole derivative. Such a variation is attributed to exciton delocalization effects in the crystalline domains that are formed during the annealing process as well as to the exciton quenching at grain boundaries.

Original languageEnglish
Pages (from-to)14196-14201
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume14
Issue number41
DOIs
StatePublished - Nov 7 2012

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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