Patent ID: 8518778

Claim:
A method of forming a semiconductor structure, comprising: providing a substrate of a first conductivity type, the substrate having a first area, a second area, and a third area, wherein the second area is disposed between the first area and the third area; forming an epitaxial layer of the first conductivity type on the substrate; forming a first gate and a second gate in the epitaxial layer, wherein the first gate is disposed in the epitaxial layer, partially in the first area and partially in the second area and the second gate is disposed in the epitaxial layer, partially in the second area and partially in the third area; forming a body layer of a second conductivity type in the epitaxial layer in the first area and the second area; forming a first doped region of the first conductivity type in the body layer in the first area; forming a dielectric layer on the substrate to expose a portion of the first doped region in the first area, at least the epitaxial layer in the third area and at least a portion of the second gate; removing a portion of the first doped region, a portion of the epitaxial layer and a portion of the second gate by using the dielectric layer as a mask, so as to form a first opening in the first doped region and in a portion of the body layer outside the first doped region in the first area, and a second opening in the epitaxial layer in the third area and in a portion of the second gate; filling a first metal layer in the first opening and the second opening; and forming a second metal layer on the substrate to cover the dielectric layer and the first metal layer.