Patent ID: 6613622
Filing Date: 2003-09-02
Classification: H01L

Abstract:
A method of forming a semiconductor device comprising:providing a semiconductor substrate of a first conductivity type having a surface; forming a well of the first conductivity type extending into the semiconductor substrate from the surface of the semiconductor substrate; forming a first region of a second conductivity type intersecting a portion of the well and extending from the surface of the semiconductor substrate including forming the second conductivity type opposite in conductivity to the first conductivity type; forming a source region of the second conductivity type in the semiconductor substrate and laterally displaced a first distance from the first region; forming a second region of the second conductivity type abutting sidewalls of the well and extending from the surface of the semiconductor substrate including forming the second region laterally displaced from the source region wherein the well is between the source region and the second region; forming a drain region of the second conductivity type in the second region and intersecting the surface of the semiconductor substrate; and forming at least one buried layer of the second conductivity type within the well and extending laterally across the well to intersect the first region.