Enhancing the Intrinsic Stability of Nonfullerene Acceptors through Dimerization via Ring-locking Strategy
Yaxin He , Ji Wan , Xianglang Sun , Jie Min , Zhong’an Li
Chinese Journal of Chemistry ›› 2025, Vol. 43 ›› Issue (6) : 641 -649.
Enhancing the Intrinsic Stability of Nonfullerene Acceptors through Dimerization via Ring-locking Strategy
The power conversion efficiencies (PCEs) of non-fullerene acceptor (NFA)-based organic solar cells (OSCs) have undergone an exciting development in recent years, but the poor intrinsic stability of exocyclic ethylene bridges in NFAs poses a significant challenge to their commercialization. In this work, we propose a new pyran-locking strategy that can stabilize the exocyclic ethylene bridge connecting the strong electron-deficient 2-(3-oxo-2, 3-dihydroinden-1-ylidene)malononitrile end group, based on which two dimerized NFAs (ITBIC-F and TBTBIC-F) with an A-D-π-A-π-D-A structure have been successfully synthesized with significantly improved chemical and photochemical stabilities in comparison with traditional NFAs without the ring-locked structure. The ITBIC-F and TBTBIC-F -based OSCs not only achieve promising PCEs of 13.03% and 10.01%, respectively, but also show good device stability; the ITBIC-F-based unencapsulated devices can retain 75% and 62% of their initial PCEs, respectively, under continuous heat (85°C) and light irradiation (LED, 100 mW·cm –2) in a nitrogen atmosphere.
Organic solar cells / Electron acceptors / Intrinsic stability / Ring-locking strategy / Photovoltaic properties
2024 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
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