Patent ID: 6284647
Filing Date: 2001-09-04
Classification: H01L,Y10S

Abstract:
A method for forming shallow trench isolations to avoid the dishing effect occurring on a surface of the shallow trench isolations, comprising the steps of:providing a substrate having at least a first active area region and a second active area region;forming a plurality of first trenches in the first active area region and a plurality of second trenches in the second active area region;computing a first integration of the first trenches in the first active area region and a second integration of the second trenches in the second active area region;comparing the first integration and the second integration by a computer program;forming a plurality of dummy mesas in the first trenches and the second trenches to divide the first trenches and the second trenches into a plurality of third trenches and a plurality of fourth trenches, respectively, wherein the third trenches and the fourth trenches have the same integration according to a comparing result from the computer program;forming an insulating layer over the substrate to fill the third and the fourth trenches; andperforming a chemical-mechanical polishing process to remove a portion of the insulating layer until a surface of the dummy mesas is exposed.