Patent ID: 8278198

Claim:
A method of producing a Schottky diode comprising the steps of: preparing a semiconductor substrate; forming a first conductive type embedded oxide film and a first conductive type epitaxial layer on the semiconductor substrate; forming a first conductive type diffusion layer in the first conductive type epitaxial layer so that the first conductive type diffusion layer is connected to the first conductive type embedded oxide film; forming an insulation film on the first conductive type epitaxial layer; forming a second conductive type diffusion layer through ion implantation with the insulation film as a mask so that an electrical field concentration at an end portion of the Schottky diode is alleviated; forming a silicide layer (a metal layer) at an upper portion of the second conductive type diffusion layer; forming a contact in the insulation film so that the contact is connected to the first conductive type diffusion layer; and forming a wiring portion layer on the insulation film so that the wiring portion layer is connected to the contact, wherein said silicide layer is away from the first conductive type embedded oxide film by a first distance in a depth direction greater than a second distance between the silicide layer and the first conductive type diffusion layer in a horizontal direction, said first distance corresponds to a length between a center of the silicide layer in a plan view and a center of the first conductive type embedded oxide film in the plan view, and said second distance corresponds to a length between the center of the silicide layer and the first conductive type embedded oxide film.