Crystal Growth Regulation of α‐FAPbI3 Perovskite Films for High‐Efficiency Solar Cells with Long‐Term Stability

The two‐step sequentially deposition strategy has been widely used to produce high‐performance FAPbI3‐based solar cells. However, due to the rapid reaction between PbI2 and FAI, a dense perovskite film forms on top of the PbI2 layer immediately and blocks the FAI diffusion into the bottom of the PbI...

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