Reply to Comment on 'Interface state recombination in organic solar cells'

The Comment by Deibel and Wagenpfahl concerning recombination in organic bulk heterojunction solar cells is discussed. A simple transport and recombination model supports our previous conclusion that the bias dependence of the cell photocurrent correctly identifies the recombination kinetics, and that at low illumination intensity the recombination is first order. The analysis suggests that the two points of view may be reconciled. The experimental evidence for bimolecular recombination and some general aspects of recombination are discussed.