Patent ID: 6372636
Filing Date: 2002-04-16
Classification: H01L

Abstract:
A method of forming a composite silicon-metal nitride barrier to prevent formation of metal fluorides in a copper damascene structure comprising the steps of:providing a substrate having a passivation layer formed over a first metal layer formed on said substrate; forming a damascene structure with substantially vertical inside walls and a substantially flat bottom wall over said passivation layer therein said substrate; forming a layer of amorphous silicon over said inside walls and said bottom wall of said damascene structure; etching said amorphous silicon layer to form silicon spacers on said inside walls, while at the same time removing said amorphous silicon layer from said bottom wall of said damascene structure; forming metal nitride layer over said silicon spacers and over said bottom of said damascene structure; etching said bottom of said damascene structure to expose said first metal layer; depositing second metal over said first metal layer exposed in said damascene structure; and removing excess metal to complete the forming of the damascene of the present invention.