▎ 摘　　要

NOVELTY - The photodetector has a substrate (1), a source electrode (2), a drain electrode (3), a two-dimensional P-type semiconductor sheet (4), a two-dimensional N-type semiconductor sheet (6) and a graphene sheet (5) provided on the substrate. A graphene sheet is arranged between the two-dimensional P-type semiconductor sheet and the two-dimensional N-type semiconductor sheet and is passed between the two-dimensional P-type semiconductor sheet and the two-dimensional N-type semiconductor sheet. One end of the two-dimensional P-type semiconductor sheet is away from the graphene sheet and is electrically connected to the source electrode. One end of the two-dimensional N-type semiconductor sheet is away from the graphene sheet and is electrically connected to the drain electrode. USE - Photodetector. ADVANTAGE - The photodetector effectively improves the wide-band light absorption efficiency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of photoelectric detector. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the photodetector. Substrate (1) Source electrode (2) Drain electrode (3) Two-dimensional P-type semiconductor sheet (4) Graphene sheet (5) Two-dimensional N-type semiconductor sheet (6)