▎ 摘　　要

NOVELTY - The detector has a substrate (10), a first electrode (20), a second electrode (30), a first graphene layer (40), a black phosphorus film layer (50), a molybdenum disulfide layer (60), and a second graphene layer (70). The first electrode and the second electrode are set on a surface of one side of the substrate. A channel structure is formed between the first electrode and the second electrode. The first graphene Layer, the black phosphorus film layer, the molybdenum disulfide layer and the second graphene layer are sequentially stacked in the channel structure. The first electrode and the second electrode are in contact with the first graphene layer and the second graphene layer. A material of the substrate comprises polyethylene terephthalate, polyethylene naphthalate and polydimethylsiloxane. A material of the first electrode and the second electrode comprises gold, silver, platinum, copper, chromium, and titanium. USE - Fast photoelectric detector based on graphene/black phosphorus/molybdenum disulfide/graphene heterojunction. Can also be used for ray measurement and detection, industrial automatic control, photometry in visible light and near infrared bands, optical fiber communication, infrared remote sensing, measurement and diagnostic instruments. ADVANTAGE - The photodetector can achieve a wide-band optical response, and the response speed of the photodetector is significantly improved. The response speed can reach the microsecond level, high sensitivity, and broaden its application range. The method for preparing a fast photodetector is simple, easy to operate, and can respond quickly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing fast photodetector based on graphene/black phosphorus/molybdenum disulfide/graphene heterojunction. DESCRIPTION OF DRAWING(S) - The drawing shows the schematic diagram of a fast photoelectric detector based on a graphene/black phosphorus/molybdenum disulfide/graphene heterojunction. Substrate (10) First electrode (20) Second electrode (30) First graphene layer (40) Black phosphorus film layer (50) Molybdenum disulfide layer (60) Second graphene layer (70)