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Issue 41, 2012
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Effect of thermal annealing on exciton diffusion in a diketopyrrolopyrrole derivative

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Abstract

We show that the method we have developed for measuring the singlet exciton diffusion length in blends with [6,6]-phenyl-C61-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.

Graphical abstract: Effect of thermal annealing on exciton diffusion in a diketopyrrolopyrrole derivative

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Publication details

The article was received on 28 Apr 2012, accepted on 13 Jun 2012 and first published on 13 Jun 2012


Article type: Paper
DOI: 10.1039/C2CP41359K
Citation: Phys. Chem. Chem. Phys., 2012,14, 14196-14201
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    Effect of thermal annealing on exciton diffusion in a diketopyrrolopyrrole derivative

    O. V. Mikhnenko, J. Lin, Y. Shu, J. E. Anthony, P. W. M. Blom, T. Nguyen and M. A. Loi, Phys. Chem. Chem. Phys., 2012, 14, 14196
    DOI: 10.1039/C2CP41359K

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