Patent ID: 6682967
Filing Date: 2004-01-27
Classification: H01L,Y10S

Abstract:
A method of making a semiconductor device comprising:forming a first resist pattern on a semiconductor substrate, said resist pattern corresponding to a well boundary pattern in a horizontal plane and including a corner defined by two sides at least one of said two sides including an extended boundary pattern defining a well portion of a first well, said well portion extending into a second well by a first distance from said corner and extending along said one of said two sides for a second distance longer than said first distance; selectively introducing a first impurity, having a first conductivity type, into said semiconductor substrate by using said first resist pattern as a first mask to provide said first well therein; forming a second resist pattern corresponding to a well boundary pattern on said semiconductor substrate so as to cover said first well therewith; selectively introducing a second impurity, having a second conductivity type into said semiconductor substrate by using said second resist pattern as a second mask to provide said second well; forming a first diffused region within said first well; and forming a second diffused region within said second well.