Nongeminate recombination in organic bulk heterojunction solar cells: Contribution of exciton–polaron interaction |
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| Authors: | J?drzej Szmytkowski |
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| Institution: | 1. Department of Chemistry, University of Florida, Gainesville, Florida 32611–7200, USA;2. Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Narutowicza 11/12, 80‐233 Gdańsk, Poland |
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| Abstract: | A new model to explain nongeminate recombination in organic bulk heterojunction solar cells is presented. We suggest that the annihilation of excitons on charge carriers at the interface between donor and acceptor phases competes with the bimolecular recombination of Coulombically bound electron–hole pairs. The exciton–polaron interaction gives visible contribution to the reduction of Langevin recombination. An analytical formula, which describes the reduction prefactor, has been derived. We demonstrate that exciton–charge carrier interactions cause an increase of the recombination order. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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| Keywords: | organic solar cells charge carrier recombination exciton− polaron interaction heterojunctions |
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