Organic-inorganic hybrid perovskite solar cells (PSCs) have attracted extensive concern since its power conversion efficiency (PCE) has rapidly risen up to 25.2％ in the past decade (https://www.nrel.gov/pv/assets/pdfs/best-research-cellefficiencies.20200218.pdf).Such a rapid development benefits from the inherent advantages of perovskite materials, such as high absorption coefficient, high charge mobility, adjustable bandgap, etc [1].However, the defects are inevitably formed during the fabrication process of perovskite film by the low-temperature solution-processing method.Studies revealed the methylammonium cation (MA+) with high volatility under heating condition is prone to escape from perovskite lattice [2,3].And the presence of the relatively low activation energy for iodide migration results in the defects formation [4,5].Finally, the generation of undercoordinated Pb vacancies [6] or Pb-I antisite defects [7] on the surface and grain boundaries (GBs) of perovskite films makes perovskite films more sensitive to moisture and oxygen, then accelerating the damage of PSCs.Thus,passivating the defects on the surface and GBs is crucial for the fabrication of efficient and stable PSCs.