Abstract We report the synthesis of novel low bandgap conjugated polymer P1 comprising thiazolothiazole, benzothiadiazole and thiophene units and investigation its photovoltaic properties in organic solar cells with [70]PCBM ([6,6]-phenyl-C71-butyric acid methyl ester) and high-performing non-fullerene IT-4F acceptor (9-bis(2-methylene-((3-(1,1-dicyanomethylene)-6,7-difluoro)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2’,3’-d’]-s-indaceno [1,2-b:5,6-b’]dithiophene). Polymer P1 showed promising results in both fullerene and non-fullerene organic solar cells. In particular, P1/IT-4F blends demonstrated enhanced charge carrier mobilities and suppressed trap-assisted recombination, which resulted in impressive short-circuit current densities and decent power conversion efficiency of 8.8 % in solar cells. The fullerene-based devices delivered efficiency of 8.2 % with remarkably high open-circuit voltages. The obtained results feature conjugated polymers based on thiazolothiazole as promising absorber materials for organic solar cells.

中文翻译：

---

用于高效富勒烯和非富勒烯有机太阳能电池的新型噻唑并噻唑基共轭聚合物的设计

摘要 我们报道了包含噻唑噻唑、苯并噻二唑和噻吩单元的新型低带隙共轭聚合物 P1 的合成，并研究了其在有机太阳能电池中的光伏性能，其中含有 [70]PCBM（[6,6]-苯基-C71-丁酸甲酯）和高性能非富勒烯 IT-4F 受体（9-双（2-亚甲基-（（3-（1,1-二氰基亚甲基）-6,7-二氟）-茚满酮））-5,5,11,11-四(4-己基苯基)-二噻吩并[2,3-d:2',3'-d']-s-茚并[1,2-b:5,6-b']二噻吩)。聚合物 P1 在富勒烯和非富勒烯有机太阳能电池中均显示出有希望的结果。特别是，P1/IT-4F 混合物表现出增强的电荷载流子迁移率和抑制陷阱辅助复合，从而在太阳能电池中产生了令人印象深刻的短路电流密度和 8.8% 的不错的功率转换效率。基于富勒烯的器件具有 8.2% 的效率和非常高的开路电压。所得结果表明基于噻唑并噻唑的共轭聚合物可作为有机太阳能电池的有前途的吸收材料。