Patent ID: 6103632
Filing Date: 2000-08-15
Classification: H01L

Abstract:
A process for etching a multi-layer film of a substrate disposed within a processing chamber, said process comprising the steps of:(a) introducing a first set of process gases into an etching zone of said chamber for a first period of time sufficient to etch a first layer of said substrate, said first set of process gases comprising a gas from the group consisting of helium-containing gas and oxygen-containing gas, wherein said first set of process gases is comprised of a CF4+He:O2 gas composition, said first layer of said substrate comprising a dielectric antireflective material;(b) introducing a second set of process gases into said etching zone of said chamber for a second period of time sufficient to etch a second layer of said substrate, said second layer comprising silicide; and(c) introducing a third set of process gases into said etching zone of said chamber for a third period of time sufficient to etch a third layer of said substrate, said third layer comprising polysilicon.