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

• Published in: Laser & photonics reviews 2024-11, Vol.18 (11), p.n/a
• Main Authors: Guan, Heyuan, Liu, Fengli, He, Zhigang, Xie, Hanrong, Xie, Manyan, Fang, Ziliang, Yang, Mingxu, Chen, Bingyu, Liang, Xijie, Li, Fang, Wei, Yuming, Yang, Tiefeng, Lu, Huihui
• Format: Article
• Language: English
• Subjects: Absorption; Barium titanates; BaTiO3; Dynamic range; Electrons; Ferroelectric gating; Ferroelectric materials; Ferroelectricity; Heterostructures; Irradiation; Molybdenum disulfide; MoS2; Near infrared radiation; Nonlinear response; nonlinear upconversion; photodetector; Photoelectric effect; Photoelectric emission; Photometers; Two dimensional materials
• ISSN: 1863-8880; 1863-8899
• DOI: 10.1002/lpor.202400445

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, MoS2/BaTiO3 heterostructures are constructed through a low‐cost exfoliation and transfer method combined with spin‐coating. The photoresponse behaviors before and after assembling the BaTiO3 nanoparticles onto the MoS2 nanoflake are investigated, indicating that the high conductivity of MoS2 and ferroelectricity of BaTiO3 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 BaTiO3, subsequently absorbed by the MoS2 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. The MoS2/BaTiO3 device presents complementary integration advantages, not only achieves high photoresponsivity of 17402 A W−1, large linear dynamic range of 152 dB, and large current (≈1 mA) operation, but is also capable of nonlinear upconversion photoresponse. This work marks important progress in utilizing the nonlinear effect of ferroelectrics to solve the saturated absorption‐induced blinding issue in photodetection.