Patent ID: 7588958

Claim:
A manufacturing method of a Schottky barrier diode including (i) a first electrode which is a metal layer forming a Schottky contact with a first surface of a semiconductor layer of a first conductivity type and (ii) a second electrode forming an ohmic contact with a second surface of the semiconductor layer, the manufacturing method comprising: a guard ring formation step of forming a ring-like guard ring of a second conductivity type within the semiconductor layer, so that a part of the guard ring is exposed on the first surface of the semiconductor layer, the second conductivity type having a different charge carrier from the first conductivity type; a buried layer formation step of burying a first buried layer of the second conductivity type within the semiconductor layer so that a periphery of the first buried layer is surrounded by the guard ring without being in contact with the guard ring; and a first electrode formation step of forming the first electrode so as to be in contact with the exposed part of the guard ring; wherein in the guard ring formation step, the guard ring is formed so as to have a certain depth from the first surface of the semiconductor layer of the first conductivity type, and in the buried layer formation step, the first buried layer is formed so as to have a depth that is substantially the same as the certain depth so that the first buried layer is surrounded by the guard ring.