Patent ID: 6071812
Filing Date: 2000-06-06
Classification: H01L

Abstract:
A method of fabricating a metal contact in a reduced aspect ratio contact hole to a substrate of a semiconductor device comprising the steps of:a) forming a first insulating layer over a substrate; said substrate having a contact region where said metal contact will be formed;b) forming a first barrier layer over said first insulating layer; said first barrier layer having a first barrier opening over said contact region;c) anisotropically etching said first insulating layer through said first barrier opening forming an upper contact hole; said upper contact hole defined by sidewalls of said first insulating layer; said upper contact hole extends partially through said first insulating layer;d) forming a second barrier layer on said first barrier layer and said first insulating layer;e) anisotropically etching said second barrier layer forming spacers on sidewalls of said first insulating layer;f) anisotropically etching said first insulating layer using said first barrier layer and said spacers as an etch mask forming a lower contact hole; said lower contact hole exposing said contact region of said substrate;g) removing said first barrier layer and said spacers; said upper contact hole and said lower contact hole comprise said reduced aspect ratio contact hole.