Suppressing Intermediate-Phase Heterogeneity Enables Efficient and Stable CsPbI3 Solar Cells.
All-inorganic CsPbI3 perovskite solar cells are promising for durable photovoltaics owing to their superior resistance to thermal decomposition and halide segregation compared with hybrid counterparts. However, their photovoltaic performance remains hampered by poor crystalline quality arising from heterogeneous interm...