Cai Yunhao, Xie Cong, Li Qian, Liu Chunhui, Gao Jiaxin, Jee Min Hun, Qiao Jiawei, Li Yun, Song Jiali, Hao Xiaotao, Woo Han Young, Tang Zheng, Zhou Yinhua, Zhang Chunfeng, Huang Hui, Sun Yanming
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
School of Chemistry, Beihang University, Beijing, 100191, P. R. China.
Adv Mater. 2023 Feb;35(8):e2208165. doi: 10.1002/adma.202208165. Epub 2022 Dec 20.
Although all-polymer solar cells (all-PSCs) show great commercialization prospects, their power conversion efficiencies (PCEs) still fall behind their small molecule acceptor-based counterparts. In all-polymer blends, the optimized morphology and high molecular ordering are difficult to achieve since there is troublesome competition between the crystallinity of the polymer donor and acceptor during the film-formation process. Therefore, it is challenging to improve the performance of all-PSCs. Herein, a ternary strategy is adopted to modulate the morphology and the molecular crystallinity of an all-polymer blend, in which PM6:PY-82 is selected as the host blend and PY-DT is employed as a guest component. Benefiting from the favorable miscibility of the two acceptors and the higher regularity of PY-DT, the ternary matrix features a well-defined fibrillar morphology and improved molecular ordering. Consequently, the champion PM6:PY-82:PY-DT device produces a record-high PCE of 18.03%, with simultaneously improved open-circuit voltage, short-circuit current and fill factor in comparison with the binary devices. High-performance large-area (1 cm ) and thick-film (300 nm) all-PSCs are also successfully fabricated with PCEs of 16.35% and 15.70%, respectively.Moreover, 16.5 cm organic solar module affords an encouraging PCE of 13.84% when using the non-halogenated solvent , showing the great potential of "Lab-to-Fab" transition of all-PSCs.
尽管全聚合物太阳能电池（all-PSC）展现出巨大的商业化前景，但其功率转换效率（PCE）仍落后于基于小分子受体的同类电池。在全聚合物共混物中，由于在成膜过程中聚合物给体和受体的结晶度之间存在棘手的竞争，难以实现优化的形态和高分子有序性。因此，提高全聚合物太阳能电池的性能具有挑战性。在此，采用三元策略来调节全聚合物共混物的形态和分子结晶度，其中选择PM6:PY-82作为主体共混物，并采用PY-DT作为客体组分。受益于两种受体良好的混溶性以及PY-DT更高的规整性，三元基质具有明确的纤维状形态和改善的分子有序性。因此，最佳的PM6:PY-82:PY-DT器件产生了创纪录的18.03%的高PCE，与二元器件相比，同时提高了开路电压、短路电流和填充因子。还成功制备了高性能大面积（1平方厘米）和厚膜（300纳米）的全聚合物太阳能电池，其PCE分别为16.35%和15.70%。此外，当使用非卤化溶剂时，16.5平方厘米的有机太阳能模块提供了令人鼓舞的13.84%的PCE，显示了全聚合物太阳能电池“从实验室到工厂”转变的巨大潜力。
