Patent ID: 6821894
Filing Date: 2004-11-23
Classification: H01L

Abstract:
A method for producing a metal contact in a dielectric comprising the steps of forming a contact via in said dielectric;providing a liner made of titanium or a titanium compound on the whole area of said dielectric and in said contact via; providing a metalization on said whole area, on said dielectric and in said contact via, wherein at least in the surroundings of said contact via providing an auxiliary layer on said dielectric between said dielectric and said liner, perforating said liner and said auxiliary layer to form a plurality of perforations; undercutting said liner by etching said liner through said perforation, and removing said metalization on said liner and said auxiliary layer by a Chemical Mechanical Polishing process, said process stopping on said dielectric, whereby upon perforation of said liner and said auxiliary layer an under etch of said liner by removal of said auxiliary layer is effected such that the liner lying thereon is lifted off.