Patent ID: 6133164
Filing Date: 2000-10-17
Classification: H01L

Abstract:
A method for fabricating a plurality of oxide regions having a plurality of thicknesses on a semiconductor wafer, the method including the steps of:A. depositing a first masking layer on said semiconductor wafer, said first masking layer defining at least one first region for oxide growth of a first thickness;B. implanting oxygen ions into said at least one first region such that said first thickness of oxide on said at least one first region is relatively thicker;C. removing said first masking layer from said semiconductor wafer;D. depositing a second masking layer on said semiconductor wafer, said second masking layer defining at least one second region for oxide growth of a second thickness;E. implanting nitrogen ions into said at least one second region such that said second thickness of oxide on said at least one second region is relatively thinner;F. removing said second masking layer from said semiconductor wafer; andG. growing oxide on said at least one first region to have said first thickness and on said at least one second region to have said second thickness with a thermal process for said semiconductor wafer.