Two pairs of polymer donor materials based on indacenodithiophene (IDT) and indacenodithieno[3,2‐b]thiophene (IDTT) as the donor units are synthesized. Thiophene or selenophene is introduced as the π‐bridge units and electron‐deficient fluorine‐substituted quinoxaline is used as acceptor unit. Selenophene‐containing polymers PIDT‐DFQ‐Se and PIDTT‐DFQ‐Se show redshifted absorption and narrower bandgaps. Combined with IDTT donor unit, PIDTT‐DFQ‐Se shows the highest absorption coefficient. Both the IDTT unit and selenophene unit have positive effects on the hole mobilities, making PIDTT‐DFQ‐Se the highest one. The best power conversion efficiency of 7.4% is obtained from devices based on PIDTT‐DFQ‐Se:[6,6]‐phenyl C₇₁ butyric acid methyl ester (PC₇₁BM) with a J_sc of 12.6 mA cm⁻², a V_oc of 0.89 V, and a fill factor (FF) of 0.66.

中文翻译：

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Selenophene和扩展梯型供体单元对高效聚合物太阳能电池的协同效应

合成了两对基于茚并二噻吩（IDT）和茚并二噻吩并[3,2- b ]噻吩（IDTT）作为供体单元的聚合物供体材料。引入噻吩或亚硒基作为π桥单元，将缺电子的氟取代的喹喔啉用作受体单元。含硒烯的聚合物PIDT-DFQ-Se和PIDTT-DFQ-Se表现出红移的吸收和较窄的带隙。与IDTT供体单元结合使用，PIDTT-DFQ-Se表现出最高的吸收系数。IDTT单元和硒烯单元都对空穴迁移率产生积极影响，使PIDTT-DFQ-Se成为最高的空穴迁移率。使用基于PIDTT-DFQ-Se：[6,6]-苯基C ₇₁丁酸甲酯（PC ₇₁ BM）的设备可获得7.4％的最佳功率转换效率。J _sc为12.6 mA cm ^-2，V _oc为0.89 V，填充系数（FF）为0.66。