A new family of naphthalenediimide (NDI)-bithiophene-based random terpolymers (PNDI-Fu10, PNDI-Th10, and PNDI-Se10) was prepared by incorporating a small amount (10 mol%) of different chalcogenophene units, namely furan (Fu), thiophene (Th), and selenophene (Se), into a poly((N,N’-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl)-alt-5,5′-(2,2′-bithiophene)) (P(NDI2OD-T2)) backbone. The terpolymers all exhibited negligible optical property and frontier energy level differences. Interestingly, the blend film morphology and photovoltaic performance of all-polymer solar cells (all-PSCs), comprising a random terpolymer series as an acceptor and poly(6-fluoro-2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-dyl-alt-thiophene-2,5-diyl) (FTQ) as a donor, were strongly dependent on the type of chalcogenophene. Consequently, the all-PSCs revealed a clear variation in short-circuit current density (J_SC) and fill factor (FF) while retaining identical open-circuit voltages (V_OC). The greatest power-conversion efficiency of 5.88% with a high J_SC of 10.77 mA cm⁻² was observed for PNDI-Th10:FTQ because of a synergistic contribution from a more preferential π-face-on orientation and suppression of bimolecular/geminate recombination. This was confirmed by a detailed investigation on the morphology and charge dynamic structural properties. In addition to understanding their effects on photovoltaic characteristics, this study demonstrates that introducing a small amount of the chalcogenophenes into a well-performing polymer is a simple and effective method to improve J_SC values while maintaining V_OCs of the parent polymers.

中文翻译：

---

将不同硫属元素芴共聚单体掺入随机受体三元共聚物中对全聚合物太阳能电池的形态和性能的影响†

通过掺入少量（10 mol％）的不同硫属元素芴单元，即呋喃（Fu），制备了新的萘二甲酰亚胺（NDI）-联噻吩基无规三元共聚物家族（PNDI-Fu10，PNDI-Th10和PNDI-Se10）。 ，噻吩（Th）和亚硒基（Se）形成聚（（N，N'-双（2-辛基十二烷基）-萘-1,4,5,8-双（二​​甲叉酰亚胺）-2,6-二基） - ALT -5,5' - （2,2'-联噻吩））（P（NDI2OD-T2））主链。三元共聚物均显示出可忽略的光学性质和前沿能级差异。有趣的是，全聚合物太阳能电池（all-PSC）的共混膜形态和光伏性能，包括无规三元共聚物系列作为受体和聚（6-氟-2,3-双-（3-辛氧基氧基苯基）喹喔啉-5 ，8 dyl-中高音-噻吩-2,5-二基）（FTQ）作为供体，强烈依赖于硫属元素oph的类型。因此，全PSC在保持相同的开路电压（V _OC）的同时，短路电流密度（J _SC）和填充因数（FF）表现出明显的变化。最大的电源转换效率为5.88％，J _SC为10.77 mA cm ^-2观察到PNDI-Th10：FTQ是由于更优先的π面朝上取向和抑制双分子/双键重组产生的协同作用。通过对形态和电荷动态结构性质的详细研究证实了这一点。除了了解它们对光伏特性的影响外，这项研究还表明，向性能良好的聚合物中引入少量硫属元素化合物是一种简单有效的方法，可在保持母体聚合物的V _OC的同时提高J _SC值。