A new near‐IR absorbing nonfullerene acceptor (NFA), MPU4, is synthesized in three steps from an accessible selenophene–diketopyrrolopyrrole and rhodanine. The high planarity of the molecule and the extended conjugation determine that the new NFA presents a high optical absorption coefficient and a narrow bandgap. In thin films, MPU4 shows broad absorption in the visible and near‐IR regions from 550 to 930 nm. When blended with a phenothiazine‐based small‐molecule (SM) donor, SM1, the resulting additive‐free binary organic solar cell (OSC) exhibits an efficiency of 8.96% with a high open‐circuit voltage (V_oc) of 0.99 V and a short‐circuit current (J_sc) of 14.91 mA cm⁻² with a remarkably low energy loss (E_loss) of 0.42 eV. This efficiency is significantly higher (24%) than that achieved with an analogous device with a thiophene‐containing NFA (MPU1, 7.22%) instead of MPU4. Importantly, ternary solar cells prepared with SM1 as the donor and MPU4 and PC₇₁BM as acceptors afford, after solvent vapor annealing, an efficiency of 10.04% with a V_oc of 0.92 V, J_sc of 16.32 mA cm⁻², fill factor of 0.67, and E_loss of 0.49 eV. These results demonstrate the advantages of using selenophene instead of thiophene in SM OSCs.

中文翻译：

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三元有机太阳能电池，具有近红外吸收硒烯-二酮吡咯并吡咯基非富勒烯受体，效率高于10％

新的近红外吸收非富勒烯受体（NFA）MPU4是从可接触的硒烯-二酮吡咯并吡咯和罗丹宁分三步合成的。分子的高平面性和扩展的共轭确定了新的NFA具有较高的光吸收系数和较窄的带隙。在薄膜中，MPU4在550至930 nm的可见光和近红外区域显示出较宽的吸收率。与基于吩噻嗪的小分子（SM）供体SM1混合后，所得的无添加剂二元有机太阳能电池（OSC）的效率为8.96％，开路电压（V _oc）为0.99 V，短路电流（J _sc）为14.91 mA cm ^-2，且能量损耗（E_损耗）为0.42 eV。与使用含噻吩的NFA（MPU1，7.22％）而不是MPU4的类似设备相比，该效率要高得多（24％）。重要的是，在溶剂蒸汽退火之后，以SM1作为施主，MPU4和PC ₇₁ BM作为受主制备的三元太阳能电池，其效率为10.04％，V _oc为0.92 V，J _sc为16.32 mA cm ^-2，填充系数0.67的E_损耗和0.49 eV的E_损耗。这些结果证明了在SM OSC中使用硒烯代替噻吩的优势。