Polaron Recombination in Pristine and Annealed Bulk Heterojunction Solar Cells

Details Polaron Recombination in Pristine and Annealed Bulk Heterojunction Solar Cells Polaron Recombination in Pristine and Annealed Bulk Heterojunction Solar Cells

2008-10-02

arxiv.org/abs/0810.0542v2

Appl. Phys. Lett. 93, 163303 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1063/1.3005593

We determined the dominant polaron recombination loss mechanism in pristine and annealed polythiophene:fullerene blend solar cells by applying the photo-induced charge extraction by linearly increasing voltage (photo-CELIV) 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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