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.
@article{arxiv.0810.0542,
title = {Polaron Recombination in Pristine and Annealed Bulk Heterojunction Solar Cells},
author = {C. Deibel and A. Baumann and V. Dyakonov},
journal= {arXiv preprint arXiv:0810.0542},
year = {2008}
}