Patent ID: 8062955

Claim:
A substrate processing method comprising: applying electroless plating of a Co (cobalt) alloy onto a Cu (copper) interconnection line formed on a substrate; and performing a post-cleaning process by use of a cleaning liquid on the substrate, after the electroless plating, wherein the method repeats the electroless plating and the post-cleaning process a plurality of times, thereby forming a plated film on the interconnection line, and wherein the post-cleaning process includes: performing a first rinsing process for removing an electroless plating liquid deposited on the substrate, by use of a rinsing liquid as the cleaning liquid; performing a chemical liquid process for removing a by-product formed by an electroless plating reaction on a surface of the interconnection line, by use of a chemical liquid as the cleaning liquid, after the first rinsing process; and performing a second rinsing process for removing the chemical liquid deposited on the substrate, by use of a rinsing liquid as the cleaning liquid, after the chemical liquid process.