Patent ID: 7678421

Claim:
A method of depositing a Ru metal layer on a substrate, the method comprising: providing a substrate in a process chamber of a deposition system; forming a process gas containing ruthenium-carbonyl precursor vapor and a CO gas by: heating a solid ruthenium-carbonyl precursor in a precursor evaporation system to a temperature and maintaining the ruthenium-carbonyl precursor at the temperature to form the ruthenium-carbonyl precursor vapor, and flowing the CO gas in contact with the solid ruthenium-carbonyl precursor in the precursor evaporation system during the heating to capture the ruthenium-carbonyl precursor vapor in the CO gas as the vapor is being formed; transporting the process gas from the precursor evaporation system to the process chamber; and exposing the substrate to the process gas to deposit a Ru metal layer on the substrate by a thermal chemical vapor deposition process.