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The spatially resolved photogeneration of excitons in bilayer organic solar cells (OSC) was simulated by a detailed optical model. A layering scheme involving up to six different ultrathin films on the substrate was taken into account, including the optical constants, interference effects and resulting standing waves. Thus a strong dependency of local exciton generation on the specific geometry and the wavelength was shown. To determine the distribution of the generated excitons the continuity equation was solved. By defining the quenching properties of cell interfaces the influence of interface exciton dissociation was demonstrated. With given exciton diffusion lengths the generation of charge carriers and the quantum efficiency of phthalocyanine‐C60 OSCs was calculated. The applicability of the model is discussed by comparison with experimental data. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Breyer et al. (2006) studied this question.
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