Polaron recombination in pristine and annealed bulk heterojunction solar cells

Deibel, C.; Baumann, A.; Dyakonov, V.
October 2008
Applied Physics Letters;10/20/2008, Vol. 93 Issue 16, p163303
Academic Journal
We determined the dominant polaron recombination loss mechanism in pristine and annealed polythiophene:fullerene blend solar cells by applying the photoinduced charge extraction by linearly increasing voltage method in dependence on temperature. In pristine samples, we find a strongly temperature-dependent bimolecular polaron recombination rate, which is reduced as compared to the Langevin theory. For the annealed sample, we observe a polaron decay rate which follows a third order of carrier concentration almost temperature independently.


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