Volatile Additive‐Mediated Crystallization Modulation of CsPbI 2 Br Perovskite Films for Efficient and Stable Solar Cells
All‐inorganic CsPbI 2 Br perovskite is a promising absorber for efficient solar cells due to its excellent thermal stability and suitable bandgap. However, uncontrolled crystallization during solution processing often leads to high defect densities and severe non‐radiative recombination, limiting device performan...