Organometal lead halides perovskites are promising solar cells material due to their outstanding properties such as tuneable bandgap, impressive tolerance to defects, long exciton diffusion length, high carrier mobility and absorption coefficient. Up to now, the organometal lead halides based solar cells (PSCs) have demonstrated impressive power conversion efficiency reaching 25.2% (not stabilised). However, their operating life-times are limited due to degradation of the organic components under some environmental conditions. Therefore, researchers have focused their interest on the all inorganic perovskite; especially on the caesium lead triiodide perovskite (CsPbI₃) which exhibits a better compositional and chemical stability. Nevertheless, the phase instability of the black phase of this material constitutes its main limitation for its use in the solar cell devices production. This review aims to present the most impactful research giving insights on the factors that may cause the instability of all-inorganic lead halide perovskite materials, as well as the instability of the whole device. In addition to deposition methods, the composition, structure and optical properties of inorganic perovskite materials have also been presented. Furthermore, this review highlights the different strategies used in order to improve the phase stability of caesium lead halide perovskite material through either engineering on the material structure or the fabrication method.

有机金属卤化铅钙钛矿因其出色的性能（如可调节的带隙，对缺陷的出色耐受性，长的激子扩散长度，高的载流子迁移率和吸收系数）而成为有前途的太阳能电池材料。到目前为止，基于有机金属卤化铅的太阳能电池（PSC）已显示出令人印象深刻的功率转换效率，达到25.2％（未稳定）。然而，由于有机组分在某些环境条件下的降解，它们的使用寿命受到限制。因此，研究人员将注意力集中在所有无机钙钛矿上。尤其是在三碘化钙铯钙钛矿上（CsPbI ₃），具有更好的成分和化学稳定性。然而，该材料的黑相的相不稳定性构成了其在太阳能电池器件生产中的使用的主要限制。这篇综述的目的是提出最具影响力的研究，对可能导致全无机卤化铅钙钛矿材料不稳定以及整个设备不稳定的因素进行深入分析。除沉积方法外，还提出了无机钙钛矿材料的组成，结构和光学性质。此外，本综述重点介绍了通过对材料结构进行工程设计或制造方法来改善卤化铯铯钙钛矿材料的相稳定性所使用的不同策略。