Patent ID: 7358180

Claim:
A method of forming a wiring structure, wherein a first conductive material filling a connection hole while placing a first underlying film thereunder, and a second conductive material filling a groove while placing a second underlying film thereunder are connected by a single damascene process, comprising the steps of: forming said connection hole in a first insulating film on a substrate; forming, under a first film forming mode, said first underlying film on said first insulating film to cover the inner wall surface of said connection hole; filling said connection hole with said first conductive material while placing said first underlying film thereunder; removing said first conductive material and said first underlying film on said first insulating film to leave said first conductive material only in said connection hole; forming a second insulating film to cover the top surface of said first conductive material; forming said groove in said second insulating film to expose the top surface of said first conductive material; forming, under a second film forming mode which differs from said first film forming mode, said second underlying film on said second insulating film to cover the inner wall surface of said groove including the top surface of said first conductive material; and filling said groove with said second conductive material while placing said second underlying film thereunder; wherein both said first film forming mode and said second film forming mode adopt sputtering process, but differ in film forming conditions, wherein, under said first film forming mode, said sputtering process is proceeded in a plurality of sputtering steps including: a first sputtering step proceeded under setting of Vd/Ve>1, where Vd/Ve being a ratio of deposition rate (Vd) and etch rate (Ve) of said first underlying film; and a second spattering step proceeded under setting of Vd/Ve<1, where Vd/Ve being a ratio of deposition rate (Vd) and etch rate (Ve) of said first underlying film.