Patent ID: 7381603

Claim:
A method for forming a lateral IGFET device comprising the steps of: providing a semiconductor substrate having a drift region of a first conductivity type, wherein the semiconductor substrate comprises a second conductivity type; forming a body region of the second conductivity type adjacent the drift region; forming a drain contact region of the first conductivity type adjacent the drift region; forming spaced apart trenches in the drift region between the drain contact and the body region; doping sidewall and lower surfaces of the spaced apart trenches with a dopant of the first conductivity type to form first doped regions within the drift region, wherein the first doped regions have a higher doping concentration than the drift region; doping the sidewall and lower surfaces of the spaced apart trenches with a dopant of the second conductivity type to form second doped regions within the first doped regions, wherein each trench has a first doped region and a second doped region wrapped around its lower surface; filling the spaced apart trenches with a material; forming a source region of the first conductivity type in the body region; and forming a gate structure adjacent to the body region.