Patent ID: 6881135

Claim:
A method for polishing a wafer with a polishing head comprising a carrier, a supporter positioned at an internal region of the carrier configured to provide a first fluid path, the supporter having a lower surface including a plurality of first holes which communicate with the first fluid path, a chucking ring in the carrier about the supporter configured to provide a second fluid path having a lower surface including a plurality of second holes which communicate with the second fluid path, and a membrane enclosing the lower surface of the chucking ring, the membrane having a plurality of third holes in alignment with the second holes of the chucking ring, comprising: chucking the wafer at the chucking ring by applying a vacuum to the first fluid path through the second holes of the supporter and the corresponding third holes of the membrane; loading the wafer on an abrasive polishing pad; applying pressurized fluid to the first fluid path and the second fluid path; and polishing the wafer.