Patent ID: 7915173
Filing Date: 2011-03-29
Classification: H01L

Abstract:
1. A method for manufacturing a shallow trench isolation structure, the method comprising: etching a plurality of trenches into a silicon substrate, the trenches having an upright wall portion, a bottom floor portion, and a corner portion connecting the upright wall portion and the bottom floor portion; conformally depositing a dielectric layer into the trenches, the dielectric layer covering at least part of the upright wall portion, at least part of the bottom floor portion, and at least part of the corner portion; oxidizing the dielectric layer, wherein a portion of the dielectric layer deposited over the corner portion is oxidized at a first oxidization rate, and a portion of the dielectric layer deposited over the upright wall portion is oxidized at a second oxidization rate, wherein the first oxidization rate is less than the second oxidization rate; and depositing an electrically insulating material into the trenches over the dielectric layer.