Patent ID: 7799681
Filing Date: 2010-09-21
Classification: C23C,H01L

Abstract:
1. A method of forming a semiconductor device, comprising: providing a planarized patterned substrate containing a copper (Cu) metal surface and a dielectric layer surface; depositing a first ruthenium (Ru) metal on the Cu metal layer surface; depositing additional Ru metal directly on the dielectric layer surface during the depositing of the first Ru metal, wherein the amount of the additional Ru metal is less than the amount of the first Ru metal; and at least substantially etching the additional Ru metal from the dielectric layer surface to selectively form a Ru metal cap layer on the Cu metal layer surface and not on the dielectric layer surface, wherein the etching comprises a dry etching process that exposes the additional Ru metal to a halogen-containing etch gas containing NF