Patent ID: 6017815
Filing Date: 2000-01-25
Classification: H01L,Y10S

Abstract:
A method of fabricating a border-less via, comprising:a. providing a substrate, which comprises forming a plurality of patterned metal lines having gaps between respective ones of the metal lines, and forming a first insulating layer in one of the gaps;b. forming a second insulating layer over the substrate, wherein the second insulating layer is composed of a different material than a material composing the first insulating layer;c. using a photomask, patterning and etching the second insulating layer to form a via exposing a surface area of one of the metal lines, wherein the etching is performed at a selectivity such that the second insulating layer has an etching rate that is more than fifty times quicker than an etching rate of the first insulating layer;d. forming a conductive plug within the via; ande. forming a second conductive layer over the second insulating layer, so that the second conductive layer contacts the conductive plug.