Halogenated thiophenes are generally used units for constructing organic semiconductor materials for photovoltaic applications. Here, we introduced thiophene, 2-bromothiophene, and 2-chlorothiophene units to the central core of quinoxaline-based acceptors and obtained three acceptors, Qx-H, Qx-Br, and Qx-Cl, respectively. Compared with Qx-H, Qx-Br and Qx-Cl showed enhanced absorption, down-shifted energy levels, improved crystallinity, and reduced energy disorder. The improved crystallinity significantly optimized the blend morphology, leading to efficient charge generation and transport and, therefore, less bimolecular recombination. Eventually, PM6:Qx-Br-based devices exhibited an outstanding power conversion efficiency of 17.42% with a high open-circuit voltage (V_OC) of 0.915 V. Furthermore, Y6 was introduced into the PM6:Qx-Br binary system to improve the light utilization, and the resulting ternary devices delivered a high PCE of 18.36%. This study demonstrated the great potential of halogenated thiophene substitution in quinoxaline-based acceptors for building high-performance organic solar cell acceptor materials.

卤化噻吩通常是用于构建用于光伏应用的有机半导体材料的单元。在这里，我们将噻吩、2-溴噻吩和 2-氯噻吩单元引入到基于喹喔啉的受体的中心核心，并分别获得了三个受体 Qx-H、Qx-Br 和 Qx-Cl。与Qx-H相比，Qx-Br和Qx-Cl表现出增强的吸收、下移的能级、改善的结晶度和减少的能量紊乱。改进的结晶度显着优化了共混物形态，导致有效的电荷产生和传输，因此减少了双分子重组。最终，基于 PM6:Qx-Br 的器件表现出 17.42% 的出色功率转换效率和高开路电压 ( V _OC) 为 0.915 V。此外，将 Y6 引入 PM6:Qx-Br 二元体系以提高光利用率，所得三元器件的 PCE 高达 18.36%。该研究证明了卤化噻吩取代喹喔啉基受体在构建高性能有机太阳能电池受体材料方面的巨大潜力。