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

2009-07-15

arxiv.org/abs/0907.2559v1

Synth. Met. 159, 2345 (2009)

Physics

Condensed Matter

Materials Science

3 pages, 4 figures

Scientific paper

10.1016/j.synthmet.2009.07.014

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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