▎ 摘　　要

NOVELTY - Blocking impurity band detector comprises a substrate (11), a switching electrode (12) and at least one receiving unit (13). The substrate has a first surface (111) and a second surface (112) opposite to each other. The receiving unit extends from the first surface toward the second surface. The receiving unit is arranged in array on the first surface. The receiving unit is configured to receive radiation and generate the current corresponding to the received radiation. Each of the receiving units comprises a contact. The switching electrode is located at one side of the contact part towards the first surface. The material of the switching electrode includes graphene. USE - The blocking impurity band detector is used for detection system. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for: a method for preparing blocking impurity band detector. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the blocking impurity band detector used for detection system. 11Substrate 12Switching electrode 13Receiving unit 14Total electrode 15Passivation layer 16Etching isolation part 17Unit electrode 111First surface 112Second surface 151first through hole 1312Second contact part