Abstract: In this work,1,1’-sulfonyl bis（2-methyl-1H-imidazole）was doped into the light absorption layer of inverted structure perovskite solar cells with a band gap of ～1.68 eV,resulting in improved film quality and device performance. Space charge limited current（SCLC）testing results reveal that the defect density of doped perovskite films decreases significantly,while the steady-state photoluminescence（PL）analysis demonstrates that non-radiative recombination is significantly inhibited. The open-circuit voltage reaches 1.17 V and the photoelectric conversion efficiency achieves 21.42%. The unpackaged device can still maintain 96% of the initial efficiency,and the stability is significantly improved after being stored in nitrogen environment for 1000 hours.