Two wide bandgap conjugated polymers (PTCO8 and PTCO1) with different side chains, composed of alkylcarbonyl-substituted thiophene (TOC) as the electron-withdrawing unit and two-dimension benzodithiophene (BDT) as the electron-donating unit, are developed for non-fullerene polymer solar cells (PSCs). Relative to non-carbonyl-substituted control polymer PTC8, PTCO8 and PTCO1 exhibit a red-shifted absorption and deeper-lying highest occupied molecular orbital (HOMO) level. When blended with ITIC, the as-cast PTCO1-based devices yield a power conversion efficiency of up to 9.33% with an open-circuit voltage of 0.95 V, a short-circuit current density of 16.91 mA cm^-2, and a fill factor of 57.9%, outperforming those of PTC8-based devices (4.04%) and PTCO8-based devices (5.91%). This work demonstrates that the carbonyl group is a promising electron-deficient moiety to construct wide-bandgap polymers for non-fullerene PSCs. Adjusting the length of side chains is a feasible strategy to improve PSC performance further.

研发了两种具有不同侧链的宽带隙共轭聚合物（PTCO8和PTCO1），由烷基羰基取代的噻吩（TOC）作为吸电子单元和二维苯并二噻吩（BDT）作为给电子单元，富勒烯聚合物太阳能电池（PSC）。相对于非羰基取代的对照聚合物PTC8，PTCO8和PTCO1表现出红移吸收和更深的最高占据分子轨道（HOMO）水平。当与ITIC混合使用时，基于PTCO1的铸态器件在开路电压为0.95 V，短路电流密度为16.91 mA cm ^{-2的情况下，}功率转换效率高达9.33％。，填充率为57.9％，优于基于PTC8的设备（4.04％）和基于PTCO8的设备（5.91％）。这项工作表明，羰基是一种有前途的电子缺陷部分，可用于构建非富勒烯PSC的宽带隙聚合物。调整侧链的长度是进一步提高PSC性能的可行策略。