| 摘 要： | Since the world-record power conversion efficiency of 15.7% was achieved for organic solar cells(OSCs) in 2019, the newly developed non-fullerene acceptor(NFA) Y6 with an A-DA′D-A structure(A denotes an electron-accepting moiety, D denotes an electron-donating moiety) has attracted increasing attention. Subsequently, many new A-DA′D-A NFAs have been designed and synthesized, and the A-DA′D-A NFAs have played a significant role in the development of high-performance non-fullerene organic solar cells(NF-OSCs). Compared with the classical A-D-A-type acceptors, A-DA′D-A NFAs contain an electrondeficient core(such as benzothiadiazole(BT), benzotriazole(BTA), quinoxaline(Qx), or their derivatives) in the ladder-type fused rings to fine-tune the energy levels, broaden light absorption and achieve higher electron mobility of the NFAs. This review emphasizes the recent progress on these emerging A-DA′D-A(including Y-series) NFAs. The synthetic methods of DA′D-fused rings are introduced. The relationships between the chemical structure of the A-DA′D-A NFAs and the photovoltaic performance of the corresponding OSCs are summarized and discussed. Finally, issues and prospects for further improving photovoltaic performance of the OSCs are also proposed.
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