The design, synthesis, and characterization of two novel nonfullerene acceptors (M8 and M34) based on ladder‐type heteroheptacenes with different heterocycles are reported. Replacing the furan heterocycles with the thiophene heterocycles in the heteroheptacene backbone leads to a hypsochromically shifted absorption band and greatly improved carrier transport for the resulting nonfullerene acceptor (M34) although the π–π‐stacking distances are barely affected. Bulk‐heterojunction polymer solar cells fabricated from M34 and a wide band gap polymer (PM6) as the donor showed a best power conversion efficiency (PCE) of 15.24 % with an open circuit voltage (V_OC) of 0.91 V, much higher than a PCE of 4.21 % and a V_OC of 0.83 V for the counterparts based on M8:PM6. These results highlight the importance of key atoms in the construction of high‐performance nonfullerene acceptors.

中文翻译：

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非富勒烯受体具有不同杂环的阶梯型杂庚烯

报道了基于具有不同杂环的梯型杂庚烯的两个新颖的非富勒烯受体（M8和M34）的设计，合成和表征。在杂庚并骨架中用噻吩杂环取代呋喃杂环会导致色变转移吸收带，并大大改善了最终的富勒烯受体（M34）的载流子传输，尽管对π-π堆积距离的影响很小。由M34和宽带隙聚合物（PM6）作为供体的体-异质结聚合物太阳能电池显示出15.24％的最佳功率转换效率（PCE），开路电压（V _OC）为0.91 V，远高于a PCE为4.21％，_VOC基于M8：PM6的对应器件的0.83 V的最大电压。这些结果突出了关键原子在高性能非富勒烯受体构建中的重要性。