Patent ID: 8890280

Claim:
A semiconductor device, comprising: a semiconductor substrate, a semiconductor drift region on said semiconductor substrate, the semiconductor drift region comprising semiconductor regions of a first conduction type and semiconductor regions of a second conduction type, the semiconductor regions of the first conduction type and the semiconductor regions of the second conduction type being alternately arranged to form a superjunction structure, wherein the semiconductor regions of the second conduction type formed by shallow angle ion implantation have a width smaller than or equal to that of the semiconductor regions of the first conduction type; a high-K dielectric on said semiconductor substrate, which is contacted with and enclosed by said semiconductor regions of the second conduction type; an active region on said semiconductor drift region, which includes a well region of a first conduction type, a source region of a second conduction type and the body contact region of a first conduction type, wherein said source region and body contact region are on the top part of said well region; and a trench gate structure on said high-K dielectric, comprising a gate dielectric and a conductive material enclosed by said gate dielectric, said trench gate structure being enclosed by said active region and being adjacent to said source region, wherein said trench gate structure extends from an upper surface to a bottom of the active region.