The power conversion efficiency (PCE) of tin perovskite solar cells is impeded by the extremely poor resistance to oxidation and high density of intrinsic Sn vacancies. Herein, we grow a 2D-quasi-2D-3D Sn perovskite film using removable pseudohalogen NH₄SCN as a structure regulator. This hierarchy structure remarkably enhances air stability resulting from the parallel growth of 2D PEA₂SnI₄ as the surface layer. We then explore the hierarchy structure perovskite films in planar structural solar cells, which generate a PCE up to 9.41%. The device retains 90% of its initial performance for almost 600 hr. Our results suggest that adding removable NH₄SCN in a perovskite precursor can significantly improve the stability and photovoltaic performance of Sn perovskite. This finding provides a powerful strategy to manipulate the structure of low-dimensional perovskite in order to enhance the performance of perovskite solar cells.

钙钛矿型太阳能电池的功率转换效率（PCE）由于极差的抗氧化性和固有锡空位的高密度而受到阻碍。在这里，我们使用可移除的拟卤素NH ₄ SCN作为结构调节剂来生长2D-准2D-3D Sn钙钛矿薄膜。这种分层结构显着增强了由于2D PEA ₂ SnI ₄作为表面层的平行生长而导致的空气稳定性。然后，我们探索了平面结构太阳能电池中的钙钛矿膜的分层结构，该膜产生的PCE高达9.41％。该设备可将其初始性能的90％保留近600个小时。我们的结果表明，添加可去除的NH ₄钙钛矿前体中的SCN可以显着提高Sn钙钛矿的稳定性和光伏性能。该发现提供了一种有效的策略来操纵低维钙钛矿的结构，以增强钙钛矿太阳能电池的性能。