Recent progress and challenges based on two-dimensional material photodetectors

Abstract Two-dimensional (2D) materials have excellent electronic and optoelectronic properties, such as ultrafast charge transport and tunable photon absorption. These 2D materials include topological semimetal graphene, semiconductor material black phosphorus, transition-metal dichalcogenides, etc. Studying the ultra-high optical response speed and sensitivity, broadband spectrum and other excellent performance photodetectors are the goals of continuous pursuit and challenge. 2D material photodetectors have become a research hotspot due to the special propert-ies of 2D materials including flexible tuning, no dangling bonds, high mobility, and many more. Herein, the electronic and optoelectronic properties of 2D materials and the quality factors of the photodetector are introduced. Then, the 2D material-based photodetectors with a detection wavelength from visible light to the terahertz band are summarized systematically. Finally, the prospects and challenges of 2D material-based photodetectors are discussed briefly.