Patent ID: 6933215
Filing Date: 2005-08-23
Classification: H01L

Abstract:
1. A method of producing a doped semiconductor active device structure, comprising the steps: a) providing a semiconductor body including an active device region that is to have said active device structure formed therein; b) providing a mask layer with a mask window as an opening having an opening size therein on a surface of said semiconductor body; c) introducing a first dopant into said active device region of said semiconductor body through all of said opening size of said mask window of said mask layer; d) after said step c), leaving said mask layer in place on said surface of said semiconductor body, and carrying out anisotropic etching of said semiconductor body through all of said opening size of said mask window of said mask layer so as to etch a trench from said surface into said active device region of said semiconductor body while leaving at least one first doped region containing said first dopant along at least one of two sidewalls of said trench, wherein said first doped region is located at least partly laterally offset from said mask window under said mask layer; e) after said step d), leaving said mask layer in place on said surface of said semiconductor body, and introducing a second dopant into said active device region of said semiconductor body through all of said opening size of said mask window of said mask layer so as to form a second doped region containing said second dopant at a bottom of said trench; and f) performing further fabrication to complete said active device structure including said trench and said doped regions in said active device region of said semiconductor body.