Efficient Visible–Near‐Infrared Hybrid Perovskite:PbS Quantum Dot Photodetectors Fabricated Using an Antisolvent Additive Solution Process

Abstract Organometal lead‐halide perovskites demonstrate excellent photovoltaic performance in the visible (Vis) region. However, their lack of response in the near‐infrared (NIR) region limits their applications in broadband photodetectors. Herein, an efficient Vis–NIR perovskite photodetector (PePD) created by doping PbS quantum dots (QDs) in perovskite precursors via an antisolvent additive solution process is reported. By changing the volume of the antisolvent additive, perovskite hybrid films of MAPbI₃:PbS QDs with good crystallinity and uniform grain size are created. The resultant Vis–NIR PePD exhibits a specific detectivity of 10¹² and 10¹¹ Jones in the visible and NIR regions, respectively. These results suggest that the antisolvent additive solution process can disperse PbS QDs between perovskite grain boundaries and control the perovskite crystallinity and morphology, providing a simple method to broaden the spectral response range of PePDs.