With suitable band gap (E_g ∼1.7 eV), superb optoelectronic properties, and thermal stability, CsPbI₃ has been widely acknowledged as a competitive candidate for photovoltaic devices. However, the spontaneous phase transition to a non-perovskite phase limits its further application. Mighty efforts and advances have been made to stabilize the perovskite structure of CsPbI₃ and improve power conversion efficiency of perovskite solar cells. In this review, we give insights regarding the origin of the instability of CsPbI₃ from intrinsic assessment to external stimulation and review the strategies and progress to improve the stability of CsPbI₃ perovskite structure and devices from the following aspects: (1) ionic incorporation, (2) regulating surface energy, (3) incorporating low-dimensional perovskites, and (4) surface termination. Finally, we give a brief outlook on the challenges and opportunities of all-inorganic CsPbI₃ perovskite.

凭借合适的带隙（E _g ∼1.7 eV）、优异的光电性能和热稳定性，CsPbI ₃已被广泛认为是光伏器件的竞争候选者。然而，向非钙钛矿相的自发相变限制了它的进一步应用。_{为了稳定 CsPbI 3}的钙钛矿结构并提高钙钛矿太阳能电池的功率转换效率，人们做出了巨大的努力和进步。_{在这篇综述中，我们从内在评估到外部刺激给出了关于 CsPbI 3}不稳定性起源的见解，并回顾了提高 CsPbI ₃稳定性的策略和进展钙钛矿结构和器件从以下几个方面：（1）离子掺入，（2）调节表面能，（3）掺入低维钙钛矿，以及（4）表面终止。最后，我们简要展望了全无机 CsPbI ₃钙钛矿的挑战和机遇。