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Charge separation by photoexcitation in semicrystalline polymeric semiconductors: An intrinsic or extrinsic mechanism?

We probe charge photogeneration and subsequent recombination dynamics in neat regioregular poly(3-hexylthiophene) films over six decades in time by means of time-resolved photoluminescence spectroscopy. Exciton dissociation at 10K occurs extrinsically at interfaces between molecularly ordered and disordered domains. Polaron pairs thus produced recombine by tunnelling with distributed rates governed by the distribution of electron-hole radii. Quantum-chemical calculations suggest that hot-exciton dissociation at such interfaces results from a high charge-transfer character.

preprint2011arXivOpen access
Francis PaquinGianluca LatiniMaciej SakowiczPaul-Ludovic KarsentiLinjun WangDavid BeljonneNatalie StingelinCarlos Silva
cond-mat.mtrl-sciphysics.chem-ph
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Open access8 authors2 topics
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Francis PaquinGianluca LatiniMaciej SakowiczPaul-Ludovic KarsentiLinjun WangDavid BeljonneNatalie StingelinCarlos Silva

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