Patent ID: 6479393
Filing Date: 2002-11-12
Classification: H01L,Y10S

Abstract:
A method of patterning a material over a semiconductive substrate, comprising:forming a layer of first material against a second material and over a semiconductive substrate, the semiconductive substrate comprising a surface having a center and an edge; first etching the first material in a reaction chamber, the first etching comprising a first center-to-edge uniformity across the surface of the semiconductive substrate and comprising a first selectivity for the first material relative to the second material; second etching the first material in the reaction chamber, the second etching comprising a second center-to-edge uniformity across the surface of the semiconductive substrate and comprising a second selectivity for the first material relative to the second material, the second center-to-edge uniformity being less than the first center-to-edge uniformity, the second selectivity being greater than the first selectivity; and cleaning a component of the first material from at least one sidewall of the reaction chamber between the first etching and the second etching.