▎ 摘　　要

NOVELTY - The fast photodetector has a first electrode (20) and a second electrode (30) that are spaced apart on one surface of the substrate. A channel structure is formed between the first electrode and the second electrode. A first graphene layer (40), a molybdenum disulfide layer (50), and a second graphene layer (60) are sequentially stacked in the channel structure. The first electrode and the second electrode are in contact connection with the first graphene layer and the second graphene layer, respectively. The thickness of the first graphene layer is 0.3nm-15nm. The thickness of the molybdenum disulfide layer is 0.6nm-25nm. The thickness of the second graphene layer is 0.3 nm to 15 nm. USE - Fast photodetector based on graphene/molybdenum disulfide/graphene heterojunction. ADVANTAGE - The response speed of the photodetector is significantly improved, and the response speed is set to reach the millisecond level, which is beneficial to the wide application of photodetectors. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a fast photodetector based on graphene/molybdenum disulfide/graphene heterojunction. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a fast photodetector based on graphene/molybdenum disulfide/graphene heterojunction. First electrode (20) Second electrode (30) First graphene layer (40) Molybdenum disulfide layer (50) Second graphene layer (60)