Efficient Electrical Extraction of Nonlinear Response and Large Linear Dynamic Range Implementation in MoS2/BaTiO3 Hetero‐Integrated Photodetector

Abstract Conventional photodetectors overly pursue high light‐to‐electric conversion efficiency under weak light stimulation, while disregarding the saturated absorption‐induced blinding effect upon strong light, and achieving efficient photodetection covering a large power range remains a great challenge. In this work, MoS 2 /BaTiO 3 heterostructures are constructed through a low‐cost exfoliation and transfer method combined with spin‐coating. The photoresponse behaviors before and after assembling the BaTiO 3 nanoparticles onto the MoS 2 nanoflake are investigated, indicating that the high conductivity of MoS 2 and ferroelectricity of BaTiO 3 can complement each other to improve the photoresponse of the hetero‐integrated device, acquiring a high photoresponsivity of 17402 A W −1 under 0.2 nW irradiation, and a significant 570 µA photocurrent under 8 mW irradiation, realizing a large linear dynamic range index of 152 dB, which is at the top level among layered semiconductor‐based detectors. Moreover, strong power near‐infrared light can be up‐converted to the visible band through the nonlinear effect of BaTiO 3 , subsequently absorbed by the MoS 2 and contributing to the photocurrent, providing a solution to combat and alleviate the saturated absorption issue in photodetection. This work marks a significant advancement in achieving robust high‐performance photodetection by hetero‐integrating 2D materials with ferroelectrics.