Patent ID: 6420268
Filing Date: 2002-07-16
Classification: H01L

Abstract:
A method of forming a material within an opening, comprising:forming an etch-stop layer over a substrate, the etch-stop layer having an opening extending therethrough exposing a portion of the underlying substrate and the etch-stop layer comprising an upper corner at a periphery of the opening, the upper corner having a corner angle with a first degree of sharpness; extending the opening into the substrate and forming a first layer of material comprising silicon oxide within the opening extended into the substrate, the layer not filling the opening and defining a lateral dimension of the extended opening; reducing the sharpness of the corner angle of the etch stop layer to a second degree, the lateral dimension remaining essentially unchanged; after reducing the sharpness and forming the first layer, forming a second layer of material within the opening and over the etch-stop layer, the second layer filling the opening extended into the substrate; and polishing the material to remove the material from over the etch-stop layer while leaving the material within the opening.