Homogeneously‐Dimensionalizing Perovskite Surface by Dual‐Mechano‐Chemical Regulation for Efficient Solar Cells

Br solar cell displays enhanced efficiency of 15.29% and elevated performance retention rate under dark storage over 1000 h, high temperature over 500 h as well as persistent operation over 200 h. This work provides a multidimensional surface engineering strategy for high-efficiency and stable perovskite-based photoelectric device, benefiting the large-scale fabrication in the future.