Abstract
In this work, we present a two‐dimensional electro‐optical model for the operation of bulk heterojunction (BHJ) organic solar cells with photonic crystal (PC) geometries. The model is applied to the test case of a one‐dimensional (1‐D) periodic PC device and a conventional planar control cell with poly[2‐methoxy‐5‐(3’,7’‐dimethyloctyloxy)‐p‐phenylene vinylene]:[6,6]‐phenyl C61‐butyric acid methyl ester (MDMO‐PPV:PCBM) as the photoactive BHJ material. From the optical model we demonstrate absorption enhancements of 16% for the PC device compared to the planar control cell. In terms of the electrical model, the non‐planar geometry of the PC significantly alters the internal electric field in the photoactive region, which causes a 5% reduction in the exciton dissociation probability and a significant 8.4‐fold increase in the bimolecular recombination rate. Investigations are also discussed which are currently being conducted to resolve these predictions with experiment.
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