Patent ID: 6734098
Filing Date: 2004-05-11
Classification: H01L

Abstract:
A fabrication method for a cobalt-salicide contact, comprising:forming a dielectric layer on a silicon substrate; forming a contact opening in the dielectric layer, wherein the opening exposes the silicon substrate; forming a silicon nitride spacer on a sidewall of the contact opening; forming a cobalt layer at a bottom of the contact opening; forming an ionized metal plasma titanium layer on the cobalt layer; forming a chemical vapor deposited titanium nitride layer on the ionized metal plasma titanium layer; performing a first rapid thermal process to induce a reaction between the cobalt layer and the silicon substrate to form a cobalt-salicide layer; performing a wet etching to remove an unreacted cobalt layer, the ionized metal plasma titanium layer, the chemical vapor deposited titanium nitride layer; performing a second rapid thermal process; and filling the contact opening with a conductive layer.