Patent ID: 8034717

Claim:
A fabrication method of a semiconductor integrated circuit device, comprising the steps of: (a) forming an insulating film over a device surface of a wafer; (b) depositing a ruthenium-containing film over the wafer so as to substantially cover the insulating film; (c) using a first cleaning liquid, which can dissolve ruthenium, to remove the ruthenium-containing film from over an outer edge portion of the device surface and an entire area of a back surface of the wafer, without removing a portion of the ruthenium-containing film over an inner region of the device surface; (d) depositing a copper film over the wafer so as to substantially cover said portion of the ruthenium-containing film and the insulating film; (e) using a second cleaning liquid, which can dissolve copper, to remove the copper film from over the outer edge portion of the device surface and the entire area of the back surface of the wafer, without removing a portion of the copper film over said portion of the ruthenium-containing film; and (f) after step (e), subjecting the wafer to at least one of a lithography step, an inspection step and a thermal treating step, said at least one step being performed using equipment that is also used to process other wafers to which ruthenium has not been deposited.