Guiding vertical growth and improving the buried interface of Pb-Sn perovskite films with 2D perovskite seeds for efficient narrow-bandgap perovskite solar cells and tandems

Jianxiong Yang, Zelin Wang, Xiaojia Zhao, Weiyin Gao, Gang Xing, Xiaobo Wang, Liangxu Wang, Changbo Li, Yuyi Wang, Yumin Ren, Wenjun Liu, Fan Yang, Jiaxiang Sun, He Dong, Lingfeng Chao, Yipeng Zhou, Yonghua Chen, Zhongbin Wu, Chenxin Ran, Wei Huang