Patent ID: 8357972

Claim:
A semiconductor power device, comprising: a substrate having a first conductivity type; a first semiconductor layer having a second conductivity type on the substrate; a second semiconductor layer having the second conductivity type on the first semiconductor layer; a third semiconductor layer having the second conductivity type on the second semiconductor layer; at least a recessed epitaxial structure having the first conductivity type embedded in the third semiconductor layer, wherein the recessed epitaxial structure is disposed in a cell region; a first vertical diffusion region having the first conductivity type in the third semiconductor layer, the first vertical diffusion region surrounding the recessed epitaxial structure; a source conductor disposed on the recessed epitaxial structure; and a trench isolation disposed within a junction termination region surrounding the cell region, wherein the trench isolation comprises a trench, a first insulating layer on an interior surface of the trench, and a conductive layer filled into the trench, and wherein the source conductor is electrically connected to the conductive layer.