Patent ID: 7749859
Filing Date: 2010-07-06
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, the method comprising: providing a workpiece having a buried layer disposed therein; forming an isolation ring structure within a top portion of the workpiece, the isolation ring structure extending completely through at least a portion of the buried layer, the isolation ring structure comprising a ring having an interior region; forming a diffusion confining structure within the interior region of the isolation ring structure; implanting at least one dopant element within the top portion of the workpiece into a portion of the interior region of the isolation ring structure; and heating the workpiece, causing the at least one dopant element to diffuse within the top portion of the workpiece and form a conductive region, the conductive region being coupled to the buried layer, wherein the diffusion confining structure confines lateral diffusion of the at least one dopant element within the top portion of the workpiece on at least one side.