Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)
Publication date: 5th February 2015
The purpose of the present work is to investigate: (i) how the kinetics of non-geminate recombination in organic solar cells is affected by the details of the morphology of the active layer; and (ii) how energetic disorder alters this kinetics within various morphologies. The morphologies we considered range from a bilayer with a flat interface to a bilayer with a rough interface and bulk heterojunctions with coarse and fine intercalated domains of donor and acceptor molecules. We used a three-dimensional reaction-diffusion lattice model with the charge carrier hopping rate described by the Miller-Abrahams formalism. In order to study the effect of energetic disorder on the recombination we considered: (i) a Gaussian density of states; (ii) an exponential density of states; and (iii) a composite density of states which has been found in many instances to better explain the energetic disorder in organic systems, represented by a superposition of a Gaussian distribution and an exponential distribution. The results of our Monte Carlo simulations reveal that while the morphology of the active layer can strongly influence the charge-carrier lifetime, it does not affect the general dependence of the non-geminate recombination rate on charge carrier concentration (recombination order). At the same time, the density of states defines the recombination order and has a strong effect on the charge-carrier lifetime.
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