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Perovskite semiconductor thin films that can be processed from solution have received tremendous research attention due to their great potential for photovoltaic applications.The record certified power conversion efficiency(PCE)of perovskite solar cells(PSCs)has reached an impressive level of 25.2％(https://www.nrel.gov/pv/cell-efficiency.html),which already surpasses those of tradi-tional inorganic thin-film solar cells.