High-sensitivity, high-speed, broadband mid- infrared photodetector enabled by a van der Waals heterostructure with a vertical transport channel

The document describes the design and performance of a high-sensitivity, high-speed, and broadband mid-infrared photodetector based on a graphene/black phosphorus/molybdenum disulfide/graphene (Gr/BP/MoS2/Gr) vertical heterostructure. The key advantages of the vertical device design include: Vertical transport channel: The minimized vertical channel length of tens of nanometers prevents recombination-induced charge carrier losses during transport, leading to high external quantum efficiency. Graphene electrodes: The use of transparent graphene electrodes enables spatial overlap of the junction region with the electrodes, establishing a vertical channel without impeding the transmission of incident light. The high carrier mobility of graphene ensures swift extraction of charge carriers to the external circuit.