Patent ID: 7384802
Filing Date: 2008-06-10
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, the method comprising: providing a semiconductor substrate; forming a buried layer over a top portion of the semiconductor substrate; forming a doped semiconductor layer having a first conductivity type over the buried layer; masking a sub region of the doped semiconductor layer; doping the doped semiconductor layer with an impurity of a second conductivity type opposite the first conductivity type, wherein the sub region forms a first high-voltage well region and an unmasked region of the doped semiconductor layer forms a second high-voltage well region, and wherein the first high-voltage well region adjoins the second high-voltage well region; forming a first field region extending from the first high-voltage well region into the second high-voltage well region; forming a first doped region in the first high-voltage well region and physically contacting the first field region; and forming a second doped region in the second high-voltage well region and physically contacting the first field region, wherein the first and second doped regions are of the second conductivity type.