Chem. Sci., 2026, Accepted Manuscript DOI: 10.1039/D6SC03304K, Edge Article Jiayi Liu, Yun Zhao, Liqing Zhan, Shuo Zhang, Haorui Tang, Rujun Ma, Xinwen Long, Lihui Zhou, Qifeng Zhu, Shuang Yang, Weihong Zhu, Yongzhen Wu The widely used poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) in tin-lead (Sn-Pb) mixed perovskite solar cells limits scalable fabrication and operational stability of all-perovskite tandem solar cells. The aqueous-based and acidic PEDOT:PSS can penetrate...