Constructing ternary organic solar cells (OSCs) has been the widely used and effective strategy to further enhance photovoltaic performance. Here, a novel perylene diimide (PDI) derivative, FPDI-2PDI, was developed by attaching two PDI chromophores to the bay-position of fused PDI dimer. The wide bandgap FPDI-2PDI was used as a guest electron acceptor in the classic PM6:Y6 system. The top-performing ternary device achieved simultaneously increased open-circuit voltage (V_oc) of 0.848 V, short-circuit current density (J_sc) of 27.47 mA cm^-2 and fill factor (FF) of 77.20%, yielding a significantly improved power conversion efficiency (PCE) of 18.00%, which is much higher than PCE of 16.63% of the control PM6:Y6 binary device. The incorporation of FPDI-2PDI is conducive to improving solar energy utilization, suppressing charge recombination, facilitating exciton dissociation and charge collection while enhancing the blend morphology, thus leading to increased photovoltaic performance in the corresponding ternary device. This work indicates that proper molecular design will make the PDI derivatives to be very competitive guest acceptors to construct high-efficiency ternary OSCs.

构建三元有机太阳能电池（OSC）已成为进一步提高光伏性能的广泛应用和有效策略。在这里，一种新型苝二酰亚胺 (PDI) 衍生物 FPDI-2PDI 是通过将两个 PDI发色团连接到融合 PDI 二聚体的海湾位置而开发的。宽带隙 FPDI-2PDI 被用作经典 PM6:Y6 系统中的客体电子受体。性能最佳的三元器件同时实现了 0.848 V 的开路电压 (V_oc27.47 mA cm^-2短路电流密度 (J_sc填充因子 (FF) 为 77.20%，功率转换效率 (PCE) 显着提高至 18.00%，远高于控制 PM6:Y6 二元器件的 16.63% PCE。FPDI-2PDI的加入有利于提高太阳能利用率，抑制电荷复合，促进激子解离和电荷收集，同时增强共混形态，从而提高相应三元器件的光伏性能。这项工作表明，适当的分子设计将使 PDI 衍生物成为非常有竞争力的客体受体，以构建高效的三元 OSC。