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Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.40: Poster

Monday, March 14, 2011, 17:30–19:30, P2

Excitonic coupling in poly(3-hexylthiophene)s - molecular weight and polydispersity effects.Christina Scharsich1, Anna Köhler1, •René Kalbitz2, Dieter Neher2, Ruth Lohwasser3, Mukundan Thelakkat3, Michael Forster4, Sybille Allard4, and Ullrich Scherf41Universität Bayreuth, Experimentalphysik II, 95447 Bayreuth, Germany — 2Universität Potsdam, Physik weicher Materie, 14476 Potsdam-Golm, Germany — 3Universität Bayreuth, Makromolekulare Chemie I, 95447 Bayreuth, Germany — 4Universität Wuppertal, Makromolekulare Chemie, 42119 Wuppertal, Germany

The photophysical and electronic properties of regioregular poly(3-hexylthiophene) (P3HT) are of great interest for many applications in the field of organic semiconducting materials such as solar cells and field-effect transistors. Recent research has shown that the charge carrier mobility in P3HT depends not only on the molecular weight, but also on the conformation of the polymer backbone. This was attributed to differences in the intermolecular coupling that exists in weakly aggregated P3HT chains.

By means of absorption and photoluminescence measurements in solution in combination with a Franck-Condon analysis, we determine quantitatively how the coupling strength between the chains and the fraction of aggregated chains formed depend on molecular weight, polydispersity and solvent quality. We use these data to determine the chain conformation in solution. For thin films, we show that we can control the resulting film morphology by pre-aggregates formed in solution.

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