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- W4353040037 abstract "Abstract Bimolecular charge recombination is one of the most important loss processes in organic solar cells. However, the bimolecular recombination rate in solar cells based on novel non-fullerene acceptors is mostly unclear. Moreover, the origin of the reduced-Langevin recombination rate in bulk heterojunction solar cells in general is still poorly understood. Here, we investigate the bimolecular recombination rate and charge transport in a series of high-performance organic solar cells based on non-fullerene acceptors. From steady-state dark injection measurements and drift–diffusion simulations of the current–voltage characteristics under illumination, Langevin reduction factors of up to over two orders of magnitude are observed. The reduced recombination is essential for the high fill factors of these solar cells. The Langevin reduction factors are observed to correlate with the quadrupole moment of the acceptors, which is responsible for band bending at the donor–acceptor interface, forming a barrier for charge recombination. Overall these results therefore show that suppressed bimolecular recombination is essential for the performance of organic solar cells and provide design rules for novel materials." @default.
- W4353040037 created "2023-03-23" @default.
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- W4353040037 date "2023-03-22" @default.
- W4353040037 modified "2023-10-10" @default.
- W4353040037 title "Reduced bimolecular charge recombination in efficient organic solar cells comprising non-fullerene acceptors" @default.
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- W4353040037 doi "https://doi.org/10.1038/s41598-023-31929-6" @default.
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