Highly crystalline conjugated polymers represent a key material for producing high‐performance thick‐active‐layer polymer solar cells (PSCs). However, despite their potential, a limited number of crystalline polymers are used in PSCs because of the lack of highly coplanar acceptor building blocks and insufficient light absorptivity (α < 10⁵) of most donor (D)–acceptor (A)‐type polymers. This study reports a series of novel 3,7‐di(thiophen‐2‐yl)‐1,5‐naphthyridine‐2,6‐dione (NTDT) acceptor‐based conjugated polymers, PNTDT‐2T, PNTDT‐TT, and PNTDT‐2F2T, synthesized with 2,2′‐bithiophene (2T), thieno[3,2‐b]thiophene (TT), and 3,3′‐difluoro‐2,2′‐bithiophene (2F2T) donor units, respectively. PNTDT‐2F2T exhibits superior polymer crystallinity and a much higher absorption coefficient than those of PNTDT‐2T or PNTDT‐TT because of adequate matching between highly coplanar A (NTDT) and D (2F2T) building blocks. A bulk heterojunction solar cell based on PNTDT‐2F2T exhibits a power conversion efficiency of up to 9.63%, with a high short circuit current of 18.80 mA cm⁻² and fill factor of 0.70, when a thick active layer (>200 nm) is used, without postfabrication hot processing. The findings demonstrate that the polymer crystallinity and absorption coefficient can be effectively controlled by selecting appropriate D and A building blocks, and that NTDT is a novel and versatile A building block for highly efficient thick‐active‐layer PSCs.

中文翻译：

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设计基于1,5-萘啶-2,6-二酮的共轭聚合物，以提高结晶度和光吸收能力，以实现9.63％效率的聚合物太阳能电池

高结晶共轭聚合物是生产高性能厚活性层聚合物太阳能电池（PSC）的关键材料。但是，尽管它们具有潜力，但由于大多数供体（D）-受体（A）型聚合物缺乏高度共面的受体结构单元以及光吸收率（α<10 ⁵）不充分，因此在PSC中使用了数量有限的结晶聚合物。 。这项研究报告了一系列新型的3,7-二（噻吩-2-基）-1,5-萘啶-2-6-二酮（NTDT）受体共轭聚合物，PNTDT-2T，PNTDT-TT和PNTDT -2F2T，由2,2'-联噻吩（2T）合成，thieno [3,2- b]噻吩（TT）和3,3'-difluoro-2,2'-bithiophene（2F2T）供体单元。与PNTDT-2T或PNTDT-TT相比，PNTDT-2F2T具有更好的聚合物结晶度和更高的吸收系数，这是由于高度共面的A（NTDT）和D（2F2T）构件之间的充分匹配。基于PNTDT-2F2T的大体积异质结太阳能电池表现出高达9.63％的功率转换效率，并具有18.80 mA cm ^-2的高短路电流当使用厚有源层（> 200 nm）且未进行后制造热处理时，填充系数为0.70。研究结果表明，可以通过选择合适的D和A结构单元来有效控制聚合物的结晶度和吸收系数，并且NTDT是高效稠密活性层PSC的新型多功能A结构单元。