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• W4313679605 abstract "Non-fullerene acceptors (NFAs) have enabled power conversion efficiencies exceeding 19% in organic solar cells (OSCs). However, the open-circuit voltage of OSCs remains low relative to their optical gap due to excessive non-radiative recombination, and this now limits performance. Here, we consider an important aspect of OSC design, namely management of the triplet exciton population formed after non-geminate charge recombination. By comparing the blends PM6:Y11 and PM6:Y6, we show that the greater crystallinity of the NFA domains in PM6:Y11 leads to a higher rate of triplet-triplet annihilation (TTA). We attribute this to the four times larger ground state dipole moment of Y11 versus Y6, which improves the long range NFA out-of-plane ordering. Since TTA converts a fraction of the non-emissive triplet states into bright singlet states, it has the potential to reduce non-radiative voltage losses. Through a kinetic analysis of the recombination processes under 1-Sun illumination, we provide a framework for determining the conditions under which TTA may improve OSC performance. If these could be satisfied, TTA has the potential to reduce non-radiative voltage losses by up to several tens of mV and could thus improve OSC performance." @default.
• W4313679605 created "2023-01-08" @default.
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• W4313679605 date "2023-01-05" @default.
• W4313679605 modified "2023-10-18" @default.
• W4313679605 title "Understanding the Role of Triplet-triplet Annihilation in Non-fullerene Acceptor Organic Solar Cells" @default.
• W4313679605 doi "https://doi.org/10.48550/arxiv.2301.02112" @default.
• W4313679605 hasPublicationYear "2023" @default.
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