Patent ID: 7768091

Claim:
A diamond ultraviolet sensor having a light-receiving sensitivity to ultraviolet light of a wavelength of 260 nm or less, comprising: a photoconductive type or a Schottky type light sensing device to detect light irradiated to a light-receiving unit by the change in electrical resistance of a light-receiving unit material or the change in light induced current, comprising: a diamond (100) or (111) plane single crystalline substrate, a diamond semiconductor epitaxially grown film formed on the diamond (100) or (111) plane single crystalline substrate, the diamond semiconductor epitaxially grown film having a surface obtained by removing a surface conductive layer by an oxidation treatment of a hydrogen-terminated surface or the diamond semiconductor epitaxially grown film, a rectifier electrode formed on the surface of the diamond semiconductor epitaxially grown film, the rectifier electrode being of a single layer containing no Au, and comprising at least one carbide compound selected from the group consisting of TiC, ZrC, HfC, VC, NbC, TaC, CrC, MoC, and WC, and an ohmic electrode formed on the surface of the diamond semiconductor epitaxially grown film, the ohmic electrode being of a two-layered laminate structure using no Au, comprising: a first layer of a single metal to form a solid solution with a carbide or carbon in the vicinity of a bonding interface between the diamond semiconductor epitaxially grown film and the ohmic electrode by reaction with the diamond through a heat treatment, and a second layer comprising at least one carbide compound selected from the group consisting of TiC, ZrC, HfC, VC, NbC, TaC, CrC, MoC, and WC, wherein the first layer and the second layer are processed by the heat treatment.