fig2
![Challenges and modification strategies of air-processed all-inorganic CsPbX<sub>3</sub> perovskite films for efficient photovoltaics](https://image.oaes.cc/667f445f-5645-4820-a7a1-aee30a4ed493/em30136.fig.2.jpg)
Figure 2. (A) Schemes of the 3D cubic CsPbX3 perovskite structure. (B) Crystal structure of CsPbI3 perovskite with different phases and their relative phase transitions. Copyright from Ref[13]. (C) Morphologies of CsPbI3 films prepared under different RH conditions before and after annealing. Copyright from Ref[20].