Patent ID: 7566663

Claim:
A method for manufacturing a semiconductor device or a semiconductor wafer, comprising: machining a semiconductor wafer while a back surface of said semiconductor wafer is chucked to a chucking unit of a first machining member; dechucking said semiconductor wafer from said chucking unit of said first machining member; cleaning the back surface of said semiconductor wafer with a liquid; and polishing said semiconductor wafer while chucking a back surface of said semiconductor wafer to a chucking unit of a second machining member, wherein said cleaning the back surface of said semiconductor wafer includes at least one of a first cleaning operation and a second cleaning operation, wherein said first cleaning operation includes: dechucking said semiconductor wafer from the chucking unit of said first machining member; forming a predetermined gap between the chucking unit of said first machining member and said semiconductor wafer; and cleaning the back surface of said semiconductor wafer by discharging a liquid from said chucking unit of said first machining member; and wherein said second cleaning operation includes: dechucking said semiconductor wafer from the chucking unit of said first machining member; forming a predetermined gap between the chucking unit of said second machining member and said semiconductor wafer; and cleaning the back surface of said semiconductor wafer by discharging a liquid from said chucking unit of said second machining member.