Patent ID: 6528423
Filing Date: 2003-03-04
Classification: H01L

Abstract:
A process for forming an integrated circuit structure on a semiconductor substrate characterized by formation of an improved composite barrier layer of dielectric material for protection against migration of metal ions from a metal-containing layer into low k dielectric material while mitigating undesired increase in dielectric constant and mitigating undesirable interaction between the barrier layer and photoresist material which comprises:a) forming a copper-containing layer over an integrated circuit structure; b) forming a first barrier layer of silicon carbide over said copper-containing layer; c) exposing said first layer of silicon carbide to a plasma to insert, into said first barrier layer of silicon carbide, dopant capable of enhancing the ability of said, silicon carbide barrier layer to prevent diffusion of copper from said copper-containing layer through said silicon carbide barrier layer; and d) sequentially repeating steps b and c for from 1 to 5 additional times to form a composite barrier layer of silicon carbide layers, each exposed to said plasma.