A tandem organic solar cell (OSC) is a valid structure to widen the photon response range and suppress the transmission loss and thermalization loss. In the past few years, the development of low‐bandgap materials with broad absorption in long‐wavelength region for back subcells has attracted considerable attention. However, wide‐bandgap materials for front cells that have both high short‐circuit current density (J_SC) and open‐circuit voltage (V_OC) are scarce. In this work, a new fluorine‐substituted wide‐bandgap small molecule nonfullerene acceptor TfIF‐4FIC is reported, which has an optical bandgap of 1.61 eV. When PBDB‐T‐2F is selected as the donor, the device offers an extremely high V_OC of 0.98 V, a high J_SC of 17.6 mA cm⁻², and a power conversion efficiency of 13.1%. This is the best performing acceptor with such a wide bandgap. More importantly, the energy loss in this combination is 0.63 eV. These properties ensure that PBDB‐T‐2F:TfIF‐4FIC is an ideal candidate for the fabrication of tandem OSCs. When PBDB‐T‐2F:TfIF‐4FIC and PTB7‐Th:PCDTBT:IEICO‐4F are used as the front cell and the back cell to construct tandem solar cells, a PCE of 15% is obtained, which is one of best results reported to date in the field of organic solar cells.

中文翻译：

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基于新型高效，宽带隙非富勒烯受体，低能量损失的15％效率串联有机太阳能电池

串联有机太阳能电池（OSC）是扩大光子响应范围并抑制传输损耗和热损耗的有效结构。在过去的几年中，低能隙材料在长波长区域具有广泛的吸收能力，用于后背子电池的开发引起了人们的广泛关注。但是，用于前电池的具有高短路电流密度（J _SC）和开路电压（V _OC）的宽带隙材料稀缺。在这项工作中，报道了一种新的氟取代的宽带隙小分子非富勒烯受体TfIF-4FIC，其光学带隙为1.61 eV。当PBDB-T-2F被选择作为供体，该装置提供了一个非常高的V _OC为0.98V，高的J _SC为17.6 mA cm ^-2，功率转换效率为13.1％。在如此宽的带隙下，这是表现最佳的受体。更重要的是，此组合中的能量损失为0.63 eV。这些特性确保PBDB‐T‐2F：TfIF‐4FIC是制造串联OSC的理想选择。当将PBDB‐T‐2F：TfIF‐4FIC和PTB7‐Th：PCDTBT：IEICO‐4F用作构造串联太阳能电池的前电池和后电池时，获得的PCE为15％，这是最好的结果之一迄今为止，在有机太阳能电池领域已有报道。