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Polaron Recombination In Pristine And Annealed Bulk Heterojunction Solar Cells

C. Deibel, A. Baumann, A. Wagenpfahl, V. Dyakonov
Published 2009 · Physics

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The major loss mechanism of photogenerated polarons was investigated in P3HT:PCBM solar cells by the photo-CELIV technique. For pristine and annealed devices, we find that the experimental data can be explained by a bimolecular recombination rate reduced by a factor of about ten (pristine) and 25 (annealed) as compared to Langevin theory. Aided by a macroscopic device model, we discuss the implications of the lowered loss rate on the characteristics of polymer:fullerene solar cells.

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