Patent ID: 6426016
Filing Date: 2002-07-30
Classification: H01L

Abstract:
A method to etch passivation layers and an antireflective layer on a substrate, comprising:forming a metal layer on the substrate; forming the antireflective layer on the metal layer; forming the passivation layers on the antireflective layer, wherein the passivation layer consisting of a silicon oxide layer on the antireflective layer and a silicon nitride layer on the silicon oxide layer; etching the silicon nitride layer in a first etching chamber having a first etcher of CF4 and O2, wherein the silicon nitride layer is etched in a uniformity of less than 10% in the first etching chamber; etching the silicon oxide layer in a second etching chamber having a second etcher of CHF3, CF4, Ar and He, wherein the silicon oxide layer is etching in a uniformity of less than 5% in the second etching chamber; and etching the antireflective layer in the second etching chamber to expose a surface of the metal layer for metal contacts of integrated circuits.