Patent ID: 6440819
Filing Date: 2002-08-27
Classification: H01L

Abstract:
A method of forming isolation regions on a substrate having a surface and having a masking layer formed over said substrate with a first window of a first width and a second window of a second width formed therein, wherein said first width is greater than said second width, comprising the steps of:forming a first trench of a first depth in said substrate under said first window, said first trench having a width that corresponds approximately to said first width, and forming a second trench of a second depth in said substrate under said second window, said second trench having a width that corresponds approximately to said second width, wherein said first depth is greater than said second depth; after the step of forming a first trench and a second trench, growing, in said first trench, a first isolation region of a first thickness and growing, in said second trench, a second isolation region of a second thickness; wherein said step of growing said first isolation region and said second isolation region includes exposing said substrate to an oxidizing ambient; and wherein said first isolation region and said second isolation region are formed substantially planar with said substrate surface as a result of said step of growing.