Halide perovskite materials, which are emerging as some of the most promising candidates for photovoltaics, have been widely studied and have been certified as demonstrating a comparable efficiency to single-crystal silicon solar cells. However, their low stability poses a challenge for commercialization. External impediments, like moisture, heat, and UV light, can be addressed by strict encapsulation; nevertheless, ion migration remains. The migrated ions will bring in a growing number of charged defects and phase segregation to bulk perovskite; they will cause interfacial band doping and degradation of the carrier transport layer, which will greatly hinder carrier transportation. Those effects are the origins of perovskite intrinsic instability. Thus, a thorough understanding of the operational mechanism of ion migration is urgent for the fabrication of perovskite solar cells (PSCs) with improved stability. Here, we systemically summarize the factors governing ion migration in perovskite film and the associated impact on the performance of PSCs. Light illumination, organic cations, grain boundaries, residue lattice strain and moisture have been found to make ion migration easier. Strategies developed to suppress the ion migration are also interspersed in each section.

钙钛矿卤化物材料已成为光伏领域最有希望的候选材料，已经得到了广泛的研究，并被证明具有与单晶硅太阳能电池相当的效率。然而，它们的低稳定性对商业化提出了挑战。严格的封装可以解决外部障碍，例如湿气，热量和紫外线等。然而，离子迁移仍然存在。迁移的离子将带来越来越多的带电缺陷和相偏析，形成整体钙钛矿。它们会引起界面带的掺杂和载流子传输层的退化，这将大大阻碍载流子的传输。这些影响是钙钛矿固有不稳定性的根源。因此，对于制造具有改善稳定性的钙钛矿太阳能电池（PSC），对离子迁移的操作机理有一个透彻的了解是非常紧迫的。在这里，我们系统地总结了控制钙钛矿薄膜中离子迁移的因素以及对PSC性能的影响。已经发现光照明，有机阳离子，晶界，残留晶格应变和水分使离子迁移更容易。在每个部分中还散布了为抑制离子迁移而开发的策略。已发现残留晶格应变和水分使离子迁移更容易。在每个部分中还散布了为抑制离子迁移而开发的策略。已发现残留晶格应变和水分使离子迁移更容易。在每个部分中还散布了为抑制离子迁移而开发的策略。