Patent ID: 7811935
Filing Date: 2010-10-12
Classification: H01L

Abstract:
1. A method of forming isolation regions in a substrate, comprising: forming a dielectric liner in one or more first trenches formed in a first portion of the substrate and in one or more second trenches formed in a second portion of the substrate; forming a layer of material that is selectively removable over the dielectric liner overlying the dielectric liner so as to substantially concurrently substantially fill a remaining portion of the one or more first trenches and partially fill a remaining portion of the one or more second trenches; in a single process step, substantially concurrently removing the layer of material that is selectively removable over the dielectric liner from the one or more first trenches and the one or more second trenches so as to expose the dielectric liner at a bottom of the one or more second trenches and to form a plug of the material that is selectively removable over the dielectric liner overlying a portion of the dielectric liner within the one or more first trenches; and substantially concurrently forming a layer of dielectric material on the plug in the one or more first trenches and on the exposed dielectric liner at the bottom of the one or more second trenches, wherein the second layer of dielectric material substantially fills a portion of the one or more first trenches above the plug and the one or more second trenches.