Patent ID: 6461976
Filing Date: 2002-10-08
Classification: H01L

Abstract:
A method to anisotropically etch a layer of oxide on a substrate, producing a profile in said layer of oxide at or near 90Â° from horizontal, comprising:providing a parallel plate plasma etch reactor having a first electrode and having an inert second electrode; mounting said substrate on said first electrode; providing a high pressure atmosphere within said parallel plate plasma etch reactor, said high pressure atmosphere containing C2F6, CHF3, CF4, and He, said C2F6 being predominant in relation to said CHF3 and said CF4; establishing a plasma in said high pressure atmosphere, said plasma having a high power density; exposing said layer of oxide to said plasma having a high power density; and etching said layer of oxide to expose a subjacent layer on said substrate.