Patent ID: 6191032
Filing Date: 2001-02-20
Classification: H01L

Abstract:
A method for reducing voiding of Al metal lines in a Ti/Al metal stack, the method comprising the steps of:depositing a Ti-comprising layer on a Si-comprising dielectric layer, the depositing being under conditions to provide a filter for Si migration into an Al-comprising overlayer;depositing, Si-free, the Al-comprising overlayer on the Ti-comprising layer; andmigrating an amount of Si from the Si-comprising dielectric layer through the Ti-comprising layer and into the Al-comprising overlayer, the amount of Si so migrated being no greater than that soluble in the Al-comprising overlayer such that the Al-comprising overlayer is substantially free from Si precipitates after the migrating, the migrating forming at least one substantially uniform concentration Si plane in the Al-comprising overlayer.