Patent ID: 6534829
Filing Date: 2003-03-18
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate of a first conductivity type; a source region of a second conductivity type, the source region being formed in the semiconductor substrate; a drain region of the second conductivity type, the drain region being formed in the semiconductor substrate; a channel region provided between the source and drain regions; and a gate electrode formed over the channel region, wherein the device further comprises: a buried region of the first conductivity type, at least part of the buried region being included in the drain region; a heavily doped region of the second conductivity type, the heavily doped region being provided in the inner part of the drain region, and at least between a surface of the semiconductor substrate and the buried region, the concentration of a dopant of the second conductivity type in the heavy doped region being higher than that of the dopant of the second conductivity type in the drain region; and a doped region of the first conductivity type, which is formed around the drain region, wherein the buried region of the first conductivity type is connected to the doped region of the first conductivity type, and wherein part of the heavily doped region is in contact with a drain electrode.