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The highest‐efficiency organic photovoltaic (OPV)‐based solar cells, made from blends of electron‐donating and electron‐accepting organic semiconductors, are often characterized by strongly reduced (non‐Langevin) bimolecular recombination. Although the origins of the reduced recombination are debated, mechanisms related to the charge‐transfer (CT) state and free‐carrier encounter dynamics controlled...
It is commonly thought that inhomogeneities in the bulk heterojunction thickness of donor:acceptor organic solar cells are a major efficiency‐limiting factor in scaling to modules. This is primarily related to degradation of the charge collection efficiency associated with the thicker segments of the active layer and/or loss of fill factor from thin segments where shorting occurs. We study the former...
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