Patent ID: 7838931

Claim:
A high voltage semiconductor device integrated with a Schottky diode, comprising: a first device comprising: a semiconductor substrate; a first type doped-body region in a first region of the semiconductor substrate; a second type doped-drift region in a second region of the semiconductor substrate with a junction between the second type doped-drift region and the first type doped-body region; an isolation region disposed on the semiconductor substrate defining an active region; a dielectric layer disposed on the semiconductor substrate with one end extending overlying part of the isolation region and the other end exposing a portion of the first type doped-body region; a first electrode disposed on the exposed portion of the first type doped-body region; a second type heavily doped region disposed in the second type doped-drift region and contacted with a second end of the isolation region; a second electrode disposed on the second type heavily doped region; and a third electrode disposed on the dielectric layer; and a second device comprising: a second type doped-drift region formed in a third region and a fourth region of the semiconductor substrate; a first electrode disposed on the second type doped-drift region in the third region of the semiconductor substrate; a second type heavily doped region formed in the second type doped-drift region in the fourth region of the semiconductor substrate; and a second electrode disposed on the second type heavily doped region, wherein the first type doped-body region is a ring shape doped region, and at the central region of the ring shape doped region, the isolation region defines the second type heavily doped region, wherein the ring shape doped region has two openings of the second type doped-drift regions.