Chem. Commun., 2025, Accepted Manuscript DOI: 10.1039/D5CC05388A, Communication Shuai Xu, Yanqiang Hu, Xiangqian Cui, Yirui Wang, Jingxian Fu, Guoliang Sun, Yiqiong Zhang, Yipu Wang, Minmin Wang, Yanfeng Tang Yb(TFSI)3 is employed as a post-treatment additive for perovskite films in HTM-free carbon-electrode perovskite solar cells (C-PSCs) to achieve multiple functions, including passivating surface defects, optimizing interfacial energy levels, and...