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- W4327573041 abstract "Abstract 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 by the size of donor and acceptor domains are proposed as underlying factors. Here, a novel photoluminescence‐based probe is reported to accurately quantify the donor–acceptor domain size in OPV blends. Specifically, the domain size is measured in high‐efficiency non‐fullerene acceptor (NFA) systems and a comparative conventional fullerene system. It is found that the NFA‐based blends form larger domains but that the expected reductions in bimolecular recombination attributed to the enhanced domain sizes are too small to account for the observed reduction factors. Further, it is shown that the reduction of bimolecular recombination is correlated to enhanced exciton dynamics within the NFA domains. This indicates that the processes responsible for efficient exciton transport also enable strongly non‐Langevin recombination in high‐efficiency NFA‐based solar cells with low‐energy offsets." @default.
- W4327573041 created "2023-03-17" @default.
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- W4327573041 date "2023-05-01" @default.
- W4327573041 modified "2023-10-05" @default.
- W4327573041 title "Efficient Nanoscale Exciton Transport in Non‐Fullerene Organic Solar Cells Enables Reduced Bimolecular Recombination of Free Charges" @default.
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- W4327573041 doi "https://doi.org/10.1002/adma.202211174" @default.
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