Abstract
Asymmetry has been demonstrated an effective approach in recent years to tune the structural and energetic orders of non-fullerene electron acceptors (NFAs) to prepare efficient organic solar cells (OSCs). In this article, five asymmetric NFAs, namely C9BTP-BO-ThCl-2F, C9BTP-BO-Cl-2F, C9BTP-BO-2Cl-2F, C7BTP-BO-2Cl-2F and C5BTP-BO-2Cl-2F possessing varied asymmetric end-groups and alkyl chains are synthesized to tune the charge transport networks formed within these NFAs. We found that the enhanced planarity in the asymmetric NFA can facilitate closer π-π stacking distance in either the A-to-A or A-to-D type NFA dimers, whilst the larger dipole moment can promote the formation of three-dimensional (3D) charge transport networks among NFAs. Taking those advantages, C7BTP-BO-2Cl-2F exhibit a compact 3D honeycomb network with a high packing coefficient of 72.1% and molecular packing density of 0.48 g/cm3, contributing to a superior power conversion efficiency of 18.0% when employing PM6 as the donor, with an open-circuit voltage of 0.85 V, short-circuit current of 26.7 mA cm−2 and fill factor of 79.3%. Our work provides guidelines in engineering the end group and side chains of asymmetric NFAs to achieve compact charge transport networks for high efficiency OSCs.
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This work was supported by the National Natural Science Foundation of China (52073221, 52273196).
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Realizing compact three dimensional charge transport networks of asymmetric electron acceptors for efficient organic solar cells
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Cai, J., Fu, Y., Guo, C. et al. Realizing compact three-dimensional charge transport networks of asymmetric electron acceptors for efficient organic solar cells. Sci. China Chem. 66, 508–517 (2023). https://doi.org/10.1007/s11426-022-1429-x
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DOI: https://doi.org/10.1007/s11426-022-1429-x