Patent ID: 7361955
Filing Date: 2008-04-22
Classification: H01L

Abstract:
1. A high-voltage metal-oxide-semiconductor (MOS) device, comprising: a semiconductor substrate of a first conductivity type; a drift ion well of a second conductivity type formed in said semiconductor substrate; a first isolation region formed in said drift ion well; a gate electrode formed on said semiconductor substrate and covering a portion of said first isolation region; a drain doping region of said second conductivity type disposed adjacent to said first isolation region on an opposite side to said gate electrode; a second isolation region formed in said drift ion well, said second isolation region being disposed adjacent to said drain doping region, wherein said second isolation region does not contact with any conductive layer; and a first dummy diffusion region of said second conductivity type in said drift ion well, said dummy diffusion region being disposed at a side of said second isolation region opposite to said drain doping region.