Xueying Yang, Zhongliang Yan, Shibo Wang, Pengfei Fu, Chunyan Deng, Guang Yang, Yu Lou, Zhaojin Wang, Miao Zeng, You Chen, Zhicong Zhou, Xinyu Ye, Xiaokang Sun, Chengwei Shan, Yuanmiao Sun, Aung Ko Ko Kyaw, Hanlin Hu, Zhifang Shi, Zaiwei Wang, Xinbo Yang, Xiaohong Zhang, Gang Li, Yang Bai, Hui-Ming Cheng
We report a preemptive stabilization strategy for wide-bandgap perovskites, where K + suppresses Br-rich nucleation thermodynamically and synergizes with SCN − to form a 2D phase at grain boundaries, enabling efficient and stable tandem solar cells.