Patent ID: 8076241

Claim:
A method of filling features on a substrate surface, the method comprising: providing a substrate having at least one recessed feature formed on a surface thereof, the at least one recessed feature having a width, a depth and a volume; depositing a continuous ruthenium (Ru) metal film in the at least one recessed feature by thermal chemical vapor deposition (TCVD) using a process gas containing a Ru 3 (CO) 12 precursor; contacting the continuous Ru metal film with a copper (Cu) plating bath to allow deposition of a continuous Cu metal layer on the continuous Ru metal film, wherein the Ru metal film and the continuous Cu metal layer together fill less than 100% of the width, depth and volume of the at least one recessed feature; removing the substrate from the Cu plating bath; annealing the continuous Cu metal layer in a non-oxidizing gas to form an annealed continuous Cu metal layer; and repeating the contacting, removing, and annealing to form annealed additional Cu metal in the at least one recessed feature, whereby the contacting, removing, annealing and repeating form an at least partial Cu fill in the at least one recessed feature that comprises large Cu metal grains on the continuous Ru metal film formed from the annealed continuous Cu metal layer and the annealed additional Cu metal.