Patent ID: 6187661
Filing Date: 2001-02-13
Classification: H01L

Abstract:
A method for fabricating a metal interconnect structure, comprising the steps of:providing a substrate with a first conductive layer therein;forming a first insulating layer and a second insulating layer sequentially on the substrate;patterning the second insulating layer to form a first opening exposing a part of the first insulating layer;forming a third insulating layer on the second insulating layer and in the first opening;providing a patterned photo-resist layer over the third insulating layer;patterning the third insulating layer at a bottom of the first opening and the underlying first insulating layer to form a second opening under the first opening, so that a part of the first conductive layer is exposed by the second opening;removing the patterned photo-resist layer; andfilling the first and the second opening with a second conductive layer.