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Near-Infrared Electron Acceptors with Cyano-Substituted 2‑(3-Oxo-2,3-dihydroinden-1-ylidene)malononitrile End-Groups for Organic Solar Cells

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journal contribution
posted on 2023-05-17, 16:04 authored by Mingqun Yang, Xiaoxin Tan, Bingyan Yin, Seoyoung Kim, Shuting Pang, Zhili Chen, Xiaoru Yang, Changduk Yang, Zhitian Liu, Chunhui Duan
Near-infrared (NIR) electron acceptors are critical components for constructing organic solar cells (OSCs). Herein, we report a set of A-DA′D-A-type electron acceptors with end-groups of cyano-substituted 2-(3-oxo-2,3-dihydro­inden-1-ylidene)­malono­nitrile (CN-IC), which possesses the strongest electron-withdrawing ability among the end-groups reported to date. An optical bandgap as low as 1.29 eV was obtained for the electron acceptors with CN-IC end-groups, which is decreased by 0.12 eV with respect to that of the reference electron acceptor. Meanwhile, deep-lying frontier molecular orbital energy levels were maintained in these electron acceptors. These advantages endow the electron acceptors with a broad light-harvesting range and the capacity to match prevalent polymer donors. Consequently, OSCs with a power conversion efficiency of 18.1% were obtained. These results suggest the huge potential of CN-IC in constructing NIR electron acceptors.

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