Patent ID: 8586434

Claim:
A method of manufacturing a semiconductor device, comprising: forming a first n− type epitaxial layer by performing a first epitaxial growth on a first surface of an n+ type silicon carbide substrate; forming a photosensitive layer pattern on the first n− type epitaxial layer; etching the first n− type epitaxial layer by using the photosensitive layer pattern as a mask to form a first trench to form a trench; forming a buffer layer on the first n− type epitaxial layer after the photosensitive layer pattern is removed; etching the buffer layer to form a trench passivation layer in the first trench; forming an n− type epitaxial layer by performing a second epitaxial growth on the first n− type epitaxial layer other than a portion on which the trench passivation layer is formed; and forming a p type epitaxial layer by performing a third epitaxial growth on the n-type epitaxial layer other than the portion on which the trench passivation layer is formed; wherein the forming of the n− type epitaxial layer includes forming a first trench extension portion consecutively extending from the first trench to form the trench; and wherein the forming of the p type epitaxial layer includes forming a second trench extension portion consecutively extending from the first trench extension portion to form the trench.