Tin-lead （Sn-Pb） mixed perovskites are extensively investigated in near-infrared （NIR） photodetectors （PDs） owing to their excellent photoelectric performance. However， achieving high-performance Sn-Pb mixed PDs remains challenging， primarily because of the rapid crystallization and the susceptibility of Sn²⁺ to oxidation. To address these issues， this study introduces the multifunctional molecules 2，3-difluorobenzenamine （DBM） to modulate the crystallization of Sn-Pb mixed perovskites and retard the oxidation of Sn²⁺， thereby significantly enhancing film quality. Compared with the pristine film， Sn-Pb mixed perovskite films modulated by DBM molecules exhibit a highly homogeneous morphology， reduced roughness and defect density. The self-powered NIR PDs fabricated with the improved films have a spectral response range from 300 to 1100 nm， a peak responsivity of 0.51 A W^-1， a specific detectivity as high as 2.46 × 10¹¹ Jones within the NIR region （780 to 1100 nm）， a linear dynamic range exceeding 152 dB， and ultrafast rise/fall time of 123/464 ns. Thanks to the outstanding performance of PDs， the fabricated 5 × 5 PDs array demonstrates superior imaging ability in the NIR region up to 980 nm. This work advances the development of Sn-Pb mixed perovskites for NIR detection and paves the way for their commercialization.

tin-lead mixed perovskites;near-infrared photodetectors;imaging array;oxidation;crystallization modulation