Two non-fullerene small molecule acceptors (TFQ-F and TFQ-Cl) based on quinoxaline unit were designed and synthesized for efficient organic solar cells (OSCs). These two acceptors showed intense absorption up to 900 nm and high thermal stabilities with decomposition temperatures over 360 °C due to their fused-ring skeletons. TFQ-F and TFQ-Cl are the A-D-A′-D-A type acceptors (A/A′ for acceptor unit and D for donor unit). TFQ-F and TFQ-Cl have the same D-A′-D fragment, which was flanked with different ending groups. The effect of different ending groups on their photophysical properties, electrochemical behaviors, micro-structures and charge recombination properties of active layers, and device performance were investigated systematically. PM6 with the complementary absorption to the two acceptors was used as the donor material. The pristine PM6:TFQ-F blend films displayed the optimal morphologies as revealed by AFM and TEM measurement. Organic solar cells based on PM6:TFQ-Cl blend film showed high J_SC of 25.19 mA/cm² and PCE of 13.2%. The Voc, J_SC and PCE for PM6:TFQ-F film based device were 0.857 V, 23.70 mA/cm² and 13.51%, respectively. The dependence of V_OC/J_SC on various light intensities indicated that PM6:TFQ-F/Cl based device had low charge recombination.

设计并合成了两种基于喹喔啉单元的非富勒烯小分子受体（TFQ-F 和 TFQ-Cl），用于高效有机太阳能电池（OSC）。由于它们的稠环骨架，这两种受体表现出高达 900 nm 的强烈吸收和高热稳定性，分解温度超过 360 °C。TFQ-F 和 TFQ-Cl 是 ADA'-DA 型受体（A/A' 为受体单元，D 为供体单元）。TFQ-F 和 TFQ-Cl 具有相同的 DA'-D 片段，其两侧是不同的末端基团。系统地研究了不同端基对其光物理性能、电化学行为、活性层的微观结构和电荷复合性能以及器件性能的影响。对两个受体具有互补吸收的 PM6 用作供体材料。原始的 PM6：TFQ-F 混合薄膜显示出最佳形态，如 AFM 和 TEM 测量所示。基于 PM6:TFQ-Cl 混合薄膜的有机太阳能电池表现出高J _SC为 25.19 mA/cm ²，PCE 为 13.2%。PM6:TFQ-F 薄膜器件的V oc、J _SC和 PCE 分别为 0.857 V、23.70 mA/cm ²和 13.51%。V _OC / J _SC对各种光强的依赖性表明基于 PM6:TFQ-F/Cl 的器件具有低电荷复合。