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Near-Infrared Acceptors with Imide-Containing End Groups for Organic Solar Cells.

Shiling ShiShimin ZhangZhongyuan XueXiang YaoGuangcong ZhangJiaxing GaoYanru LiXueyang TuShengnan ZhangChan ZhangZhongwei LiuZheng TangHongliang ZhongWeiwei LiZhuping Fei
Published in: ACS applied materials & interfaces (2023)
Near-infrared electron acceptors for organic solar cells (OSCs) mostly contain electron-withdrawing 2-(3-oxo-2,3-dihydro-1 H -inden-1-ylidene)malononitrile (IC) end groups, which can be modified by but limited to phenyl, thienyl, and naphthyl units with halogenated, methyl, and methyloxy substitution. In this work, we employed an imide-containing unit to construct a new IC end group, based on which a series of new electron acceptors were synthesized. The strong electron-deficient nature of imide units enables the new acceptors to show efficient intramolecular charge transfer and hence red-shifted absorption spectra compared to their IC counterparts. These new electron acceptors were applied to OSCs, providing efficiencies of over 17% with a low voltage loss of 0.52 eV. These results demonstrate that the new imide-containing end groups are promising fragments for the construction of near-infrared electron acceptors for high-performance OSCs.
Keyphrases
  • solar cells
  • ionic liquid
  • electron microscopy