Dresden 2009 – wissenschaftliches Programm

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.44: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

Exciton dynamics in a hybrid TiO2-polymer bilayer structure — •Beate Reinhold, Sylvia Paul, and Dieter Neher — Universität Potsdam, Institut für Physik und Astronomie, Physik weicher Materie

Exciton diffusion plays an important role for the performance of polymeric optoelectronic devices like organic light emitting diodes and polymer based solar cells. Therefore, understanding the exciton transport processes is a key parameter to improve device performance and to develop new interface architectures. Here, we present our results of spectroscopic investigations on bilayer structures consisting of a soluble PPV derivative as the electron donor and an acceptor layer formed from nanocrystalline TiO2. From these experiments, the exciton diffusion length and the probability for exciton dissociation at the heterojunction are determined. The results are discussed with regard to the morphology of the bilayer structure and the energetic conditions at the heterojunction.