Iodide migration causes degradation of the perovskite solar cells. Here, we observe the direct migration of iodide into the hole-transport layer in a device. We demonstrate that ultrathin room temperature atomic layer-deposited Al₂O₃ on the perovskite surface very effectively hinders the migration. The perovskite-Al₂O₃ interface enables charge transfer across the Al₂O₃ layer in the solar cells, without causing any drastic changes in the properties of the perovskite absorber. Furthermore, it helps to preserve the initial properties of the perovskite film during exposure to light and air under real operating conditions, and thus, improves the stability of the solar cells. The ultrathin Al₂O₃ layer deposited at room temperature significantly increases the lifetime of the perovskite solar cells, and we hope this may be a step toward the mass production of stable devices.

碘化物迁移导致钙钛矿太阳能电池退化。在这里，我们观察到碘化物直接迁移到器件的空穴传输层中。我们证明钙钛矿表面超薄室温原子层沉积的Al ₂ O ₃非常有效地阻碍了迁移。钙钛矿-Al ₂ O ₃界面可实现跨Al ₂ O _3的电荷转移不会使钙钛矿吸收剂的性能发生任何剧烈变化。此外，它有助于在实际操作条件下在暴露于光和空气的过程中保持钙钛矿膜的初始性能，从而改善了太阳能电池的稳定性。在室温下沉积的超薄Al ₂ O ₃层显着增加了钙钛矿太阳能电池的寿命，我们希望这可能是迈向稳定器件大规模生产的一步。