Patent ID: 8153496
Filing Date: 2012-04-10
Classification: H01L,Y02E,Y02P

Abstract:
1. A method of creating regions of differing conductivity on a substrate, comprising: covering a first region of a first surface of said substrate with a mask; implanting ions of a first species through said mask into a second region of said first surface of said substrate; performing a thermal process in a heated environment conducive to the growth of a film, where said film is an oxide or a nitride, such that film layers of different thicknesses are grown on said first surface of said substrate, wherein a second thickness on said second region is greater than a first thickness on said first region; subjecting said substrate to an etching process to remove an amount of oxide substantially equal to said first thickness, thereby exposing said first region while said film remains on said second region; implanting ions of a second species into said first region, while said film remains only on said second region; and removing said film from said second region.