Photodetectors based on two-dimensional MoS2 and its assembled heterostructures

Photodetectors are finding various potential applications in sensing and detection, information communication, light-emitting diode, optical modulators, ultrafast laser, etc. Molybdenum disulfide (MoS₂) has sparked great interest given its unique crystal phase, flexible preparation, structural stability, and regulable photoelectronic features. Therefore, the MoS₂-based photodetector is demonstrated to be an excellent device fabrication platform to explore underlying sensitive detection, broadband optical detection, high-speed response, low-power consumption, two-dimensional integrated circuit, and its synergetic mechanism, which is also proved to be an excellent candidate for next-generation optoelectronics. This review summarizes the structural, optical, and transport features of MoS₂. Then the working mechanisms and figures of merit are explored for the MoS₂ detector. Further, the detector modulation strategies are introduced in detail about layer-number engineering and chemical doping engineering. Afterward, the recent heterostructure assembling strategies (MoS₂/nD, n=0,1,2,3) of detector architectures are classified based on flexible van der Waals assembling. Finally, the future direction of MoS₂ photodetectors is discussed, which can be delivered as a feasible guideline in two-dimensional photodetector and integrated circuit fields.