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 language | English |
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Pages (from-to) | 14196-14201 |
Number of pages | 6 |
Journal | Physical Chemistry Chemical Physics |
Volume | 14 |
Issue number | 41 |
DOIs | |
State | Published - Nov 7 2012 |
ASJC Scopus subject areas
- Physics and Astronomy (all)
- Physical and Theoretical Chemistry