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The versatility and flexibility of organic photoelectric materials endow organic photovoltaic cells fine function modulation and huge commercial potential.In this work,a new noncovalent fused-ring small molecule acceptor(SMA)BID-4F has been synthesized for high-efficient organic solar cells(OSCs).BID-4F consists of a diflurobenzothiadiazole(DFBT)core,ladder-like indacenodithiophene(IDT)spacers,and di-cyanoindanone electron-withdrawing end groups,which are supposed to be conformationally interlocked by noncovalent interactions,leading to good molecular planarity.In addition,compact solid state stack-ing was revealed by UV-vis-NIR absorption spectrum.The optimized PM6:BID-4F based device delivers an eminent power conversion efficiency(PCE)of 12.30％ with a high open-circuit voltage(Voc)of 0.92 V and a high fill factor(FF)of 74.3％.Most importantly,the PCE and FF are among one of the highest values reported for the OSCs based on the unfused-ring SMAs.Overall,our work demonstrates that the unfused ring central framework with high molecular planarity through noncovalent interactions provides a good strategy to construct highly efficient SMAs.