▎ 摘　　要

NOVELTY - The photodetector (100) has a two-dimensional (2D) material layer (145) on the first graphene layer, the 2D material layer including a light absorption layer (150) and a barrier layer (140) having a larger bandgap than the light absorption layer. A second graphene layer (130) is set on the 2D material layer. A first electrode (170) is set on the first graphene layer. A second electrode (180) is set on the second graphene layer. USE - Photodetector for use as light-receiving device in optical communication network, and precise measuring system. ADVANTAGE - The barrier layer having the larger bandgap energy than the light absorption layer may prevent or reduce a flow of a dark current that may be generated even if there is no light. The doping process enables a reduction in a sheet resistance without a decrease in transmittancy of the first graphene layer. The optical characteristic of the first graphene layer is secured, and an electric characteristic resistance is improved. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of manufacturing a photodetector. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a photodetector. Photodetector (100) Second graphene layer (130) Barrier layer (140) Material layer (145) Light absorption layer (150) First electrode (170) Second electrode (180)