Herein, efficient organic solar cells (OSCs) are realized with the ternary blend of a medium band gap donor (poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)‐benzo[1,2‐b:4,5‐b′]dithiophene))‐alt‐(5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo[1′,2′‐c:4′,5′‐c′]dithiophene‐4,8‐dione)] (PBDB‐T)) with a low band gap acceptor (2,2′‐((2Z,2′Z)‐(((2,5‐difluoro‐1,4‐phenylene)bis(4,4‐bis(2‐ethylhexyl)‐4H‐cyclopenta[2,1‐b:3,4‐b′]dithiophene‐6,2‐diyl))bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (HF‐PCIC)) and a near‐infrared acceptor (2,2′‐((2Z,2′Z)‐(((4,4,9,9‐tetrakis(4‐hexylphenyl)‐4,9‐dihydro‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene‐2,7‐diyl)bis(4‐((2‐ethylhexyl)oxy)thiophene‐5,2‐diyl))bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (IEICO‐4F)). It is shown that the introduction of IEICO‐4F third component into PBDB‐T:HF‐PCIC blend increases the short‐circuit current density (J _sc) of the ternary OSC to 23.46 mA cm⁻², with a 44% increment over those of binary devices. The significant current improvement originates from the broadened absorption range and the active layer morphology optimization through the introduction of IEICO‐4F component. Furthermore, the energy loss of the ternary cells (0.59 eV) is much decreased over that of the binary cells (0.80 eV) due to the reduction of both radiative recombination from the absorption below the band gap and nonradiative recombination upon the addition of IEICO‐4F. Therefore, the power conversion efficiency increases dramatically from 8.82% for the binary cells to 11.20% for the ternary cells. This work provides good examples for simultaneously achieving both significant current enhancement and energy loss mitigation in OSCs, which would lead to the further construction of highly efficient ternary OSCs.

中文翻译：

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近红外光敏形态改性剂可显着改善三元有机太阳能电池的电流并减少能量损失

本文中，高效的有机太阳能电池（OSC）是通过中等带隙供体（聚[（2,6-（4,8-双（5-（2-乙基己基）噻吩-2-基）-苯并[1,2-b:4,5-b']二噻吩))-alt-(5,5-(1',3'-二-2-噻吩基-5',7'-双(2-乙基己基) )苯并[1′,2′-c:4′,5′-c′]二噻吩-4,8-​​二酮)](PBDB-T))与低带隙受体(2,2′-((2Z ,2′Z)-(((2,5-二氟-1,4-亚苯基)双(4,4-双(2-乙基己基)-4H-环戊基[2,1-b:3,4-b′ ]二噻吩-6,2-二基））双（亚甲基））双（5,6-二氟-3-氧代-2,3-二氢-1H-茚-2,1-二亚基））二丙二腈（HF-PCIC） ）和近红外受体（2,2′-（（2Z,2′Z）-（（（4,4,9,9-四（4-己基苯基）-4,9-二氢-s-茚二苯）[ 1,2-b:5,6-b']二噻吩-2,7-二基)双(4-((2-乙基己基)氧基)噻吩-5,2-二基))双(亚甲基))双(5 ,6-二氟-3-氧代-2,3-二氢-1H-茚-2,1-二亚基））二丙二腈（IEICO-4F））。结果表明，将IEICO-4F第三组分引入到PBDB-T中:HF-PCIC混合物将三元OSC的短路电流密度( J _{sc )提高到23.46 mA cm} ^-2，比二元器件增加了44%。电流的显着改善源于通过引入 IEICO-4F 组件而拓宽的吸收范围和活性层形态优化。此外，三元电池（0.59 eV）的能量损失比二元电池（0.80 eV）大大减少，因为添加 IEICO‐ 后，带隙以下吸收的辐射复合和非辐射复合都减少了。 4F. 因此，功率转换效率从二元电池的8.82%显着提高到三元电池的11.20%。这项工作为同时实现 OSC 中显着的电流增强和能量损失减轻提供了很好的例子，这将导致高效三元 OSC 的进一步构建。