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- W3005897239 abstract "Abstract Organic photovoltaics based on non-fullerene acceptors (NFAs) show record efficiency of 16 to 17% and increased photovoltage owing to the low driving force for interfacial charge-transfer. However, the low driving force potentially slows down charge generation, leading to a tradeoff between voltage and current. Here, we disentangle the intrinsic charge-transfer rates from morphology-dependent exciton diffusion for a series of polymer:NFA systems. Moreover, we establish the influence of the interfacial energetics on the electron and hole transfer rates separately. We demonstrate that charge-transfer timescales remain at a few hundred femtoseconds even at near-zero driving force, which is consistent with the rates predicted by Marcus theory in the normal region, at moderate electronic coupling and at low re-organization energy. Thus, in the design of highly efficient devices, the energy offset at the donor:acceptor interface can be minimized without jeopardizing the charge-transfer rate and without concerns about a current-voltage tradeoff." @default.
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- W3005897239 date "2020-02-11" @default.
- W3005897239 modified "2023-10-18" @default.
- W3005897239 title "Sub-picosecond charge-transfer at near-zero driving force in polymer:non-fullerene acceptor blends and bilayers" @default.
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- W3005897239 doi "https://doi.org/10.1038/s41467-020-14549-w" @default.
- W3005897239 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7012859" @default.
- W3005897239 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32047157" @default.
- W3005897239 hasPublicationYear "2020" @default.
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