▎ 摘　　要

NOVELTY - The detector (100) has a two-dimensional material layer (1) that includes a first region (1a) and a second region (1b) arranged along a first direction (X). First electrode portion (2a) and second electrode portion (2b) are spaced apart from each other in the first direction and are electrically connected to each other. A boundary (40) between the first and second ferroelectric material layers (4a, 4b) intersects the first direction. Each of the ferroelectric material layers is composed of a pyroelectric material. The ferroelectric material layers are provided so that the voltage change caused in the first region differs from a voltage change caused in the second region when irradiated with electromagnetic waves. The two-dimensional material layer contains any material selected from the group consisting of transition metal dichalcogenide, graphene, black phosphorus, silicene, germanene, graphene nanoribbons and borophene. USE - Electromagnetic wave detector for detecting light and radio waves as electromagnetic waves. Uses include but are not limited to X-rays, UV light, near-infrared light, terahertz waves, and microwaves. ADVANTAGE - Since the charge extraction efficiency is improved by the optical bias effect, the sensitivity of the electromagnetic wave detector is improved. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an electromagnetic wave detector array. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the electromagnetic wave detector. 1Material layer 1aFirst region 1bSecond region 2aFirst electrode portion 2bSecond electrode portion 4a, 4bFerroelectric material layers 40Ferroelectric material layer boundary 100Electromagnetic wave detector XFirst direction