@article{BartesaghiPerezKniepertetal.2015,
  author    = {Davide Bartesaghi and Irene del Carmen Perez and Juliane Kniepert and Steffen Roland and Mathieu Turbiez and Dieter Neher and L. Jan Anton Koster},
  title     = {Competition between recombination and extraction of free charges determines the fill factor of organic solar cells},
  journal   = {Nature Communications},
  volume    = {6},
  doi       = {10.1038/ncomms8083},
  year      = {2015},
}