Patent ID: 8637872

Claim:
A method of manufacturing a semiconductor device having, a substrate having a first conduction type made of SiC, a PN junction region where a second conduction type layer forms a PN junction with the semiconductor substrate and a Schottky junction region where a Schottky electrode is in Schottky contact with the semiconductor substrate, in one surface of the semiconductor substrate, comprising: a step of forming, on the semiconductor substrate, a PN junction layer having a second conduction type and an ohmic contact layer in ohmic contact with the PN junction layer in that order; an etching step of forming a mask which exposes the Schottky junction region and covers the PN junction region, on the ohmic contact layer, etching the ohmic contact layer, the PN junction layer, and a part of the substrate to form a convex portion having a trapezoidal shape in sectional view and including a second conduction type layer constituted by the PN junction layer and a part of the semiconductor substrate, and a contact layer constituted by the ohmic contact layer on the convex portion in the PN junction region, and removing the mask; and a step of forming the Schottky electrode which is provided continuously over the PN junction region and the Schottky junction region, covers the side surface of the convex portion and the contact layer, and is in Schottky contact with the semiconductor substrate in the Schottky junction region, wherein the etching step includes a step of, after etching the ohmic contact layer to expose the PN junction layer, dry-etching the PN junction layer until the semiconductor substrate is reached to form the convex portion, and then removing the ohmic contact layer, which remains in a region not overlapping the top portion of the convex portion in plan view, through wet etching.