Dresden 2009 – scientific programme

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.6: Poster

Thursday, March 26, 2009, 16:30–19:00, P1A

Influence of image force effects on the recombination in organic bulk heterojunction solar cells — •Jȩdrzej Szmytkowski — Institut für Angewandte Physik, Universität Karlsruhe (TH), Karlsruhe, Germany

It has been recently reported that an experimental bimolecular recombination coefficient in PCBM:P3HT blend solar cells is about four orders of magnitude lower than the Langevin recombination coefficient. This effect is not sufficiently explained. We present a theoretical model based on the electrical polarization effects, which is able to explain the observed discrepancies between experiment and theory. The interface recombination of one sign charge carriers located in a material with lower permittivity competes with the bimolecular recombination of electrons and holes, leading to the reduction of bimolecular recombination. We have derived an analytical formula which describes the interface recombination coefficient.