Patent ID: 7786006

Claim:
A method for forming an interconnect structure, the method comprising: providing a substrate in a deposition chamber, the substrate having a micro-feature opening formed within a dielectric material, the micro-feature opening having a sidewall surface and a bottom surface; forming a ruthenium precursor vapor by heating a Ru 3 (CO) 12 precursor in a vaporization chamber and passing a carrier gas containing CO over or through the Ru 3 (CO) 12 precursor as it is being heated to capture the ruthenium precursor vapor in the carrier gas, and transporting the ruthenium precursor vapor in the carrier gas to the deposition chamber; concurrently exposing the substrate in a thermal chemical vapor deposition process to a carbonyl precursor of a nitride-forming metal, a nitrogen precursor, and the ruthenium precursor vapor in the carrier gas to form a metal nitride diffusion barrier comprising ruthenium, nitrogen, and the nitride-forming metal over the sidewall and bottom surfaces of the micro-feature, wherein the nitride-forming metal is selected from Groups IVB, VB, VIB, and VIIB of the Periodic Table; removing the metal nitride diffusion barrier from the bottom surface of the micro-feature; then, depositing a seed layer comprising Cu or Ru over the sidewall and bottom surfaces of the micro-feature; and then, filling the micro-feature with Cu.