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Developing all‐perovskite tandem solar cells is an effective approach to extend the limit of power conversion efficiency. However, fast preparation of large‐area and high‐quality narrow‐bandgap Sn‐based perovskite films still remains a major challenge in fabricating all‐perovskite tandem modules. Here high‐crystalline and compact narrow‐bandgap perovskite films with an area over 100 cm2 are well prepared...