Patent ID: 7851883

Claim:
A semiconductor device comprising: a semiconductor substrate of a first conductivity type; a well layer in said semiconductor substrate, said well layer being of a second conductivity type that is opposite to the first conductivity type; a drain contact layer of the second conductivity type in said well layer; a body layer of the first conductivity type in said semiconductor substrate; a source layer of the second conductivity type in said body layer; a buried layer of the second conductivity type in said semiconductor substrate and below said body layer; and agate electrode above said semiconductor substrate, wherein said source layer is separated from said drain contact layer, wherein an upper end of said buried layer is in direct contact with a bottom end of said body layer, wherein said body layer is spaced apart from said drain contact layer such that a region is provided between said body layer and said drain contact layer, wherein impurities of the second conductivity type are provided in an entirety of said region between said body layer and said drain contact layer such that impurities of the first conductivity type are not included in a portion from an upper surface of said well layer to said buried layer between said body layer and said drain contact layer, and wherein said upper end of said buried layer is in direct physical contact with an entire bottom surface of said body layer such that there is no intervening layer between said buried layer and said body layer in an area of contact.