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3 September 2008 Implications of a reduced polaron recombination on polymer: fullerene solar cells
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Studying polymer:fullerene solar cells, we find that the bimolecular recombination is much lower than the anticipated Langevin recombination. In our study, we investigate the performance of annealed P3HT:PCBM bulk heterojunction solar cells by current-voltage characterisation, and complement these measurements with photo-CELIV experiments. We find that at room temperature the bimolecular recombination rate is reduced by a factor of about 50 as compared to the Langevin rate. We discuss the implications of this reduction on the solar cell performance, using a one-dimensional numeric simulator to analyse the experimental results, and compare the reduced recombination rates with the Langevin rates.
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Carsten Deibel, Alexander Wagenpfahl, Andreas Baumann, and Vladimir Dyakonov "Implications of a reduced polaron recombination on polymer: fullerene solar cells", Proc. SPIE 7052, Organic Photovoltaics IX, 70520N (3 September 2008);

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