Patent ID: 6899603

Claim:
Semiconductor device manufacturing method comprising: forming a first insulating film over a semiconductor substrate and then forming a plug in a via hole formed in said first insulating film; forming a second insulating film on said first insulating film and then forming a trench for wiring, then forming a first metal film in said trench and on said second insulating film and forming a second metal on said first metal film; polishing said second metal to expose said first metal film on the second insulating film using a first polishing liquid and then polishing said first metal film to remove said first metal film from said second insulating film using a second polishing liquid; depositing a third insulating film on said second metal and on said second insulating film; wherein the polishing of said second metal is conducted using a polishing apparatus, comprising a cover body which is opened at a bottom thereof, has a space therein, and has an elastic membrane indirectly secured to or in a portion of an inner wall thereof through a flexor and a support plate, a surface of the inner wall in a portion at which the secured elastic membrane may contact due to flex of the membrane or the flexor being made of fluororesin, and wherein the cover body covers a side and a backside surface of said semiconductor substrate placed on a polishing pad on a polishing platen, a surface of second metal is polished by providing relative motion between the polishing platen and said semiconductor substrate while a fluid introduced into an upper space above the elastic membrane expands the elastic membrane to press the backside of said semiconductor substrate in a direction toward the polishing platen.