Patent ID: 7166015

Claim:
A system for processing semiconductor substrates comprising: a polishing pad; a wafer carrier, the wafer carrier capable of being positioned at a proximate location over a polishing pad, the wafer carrier configured to receive a wafer; a first fluid capable of being placed on the polishing pad, the fluid assisting in a planarization of the wafer held by the wafer carrier; a fluid restraining device capable of controllably distributing the first fluid across the polishing pad; a fluid displacing device capable of being positioned at a proximate location over the polishing pad between the fluid restraining device and the carrier head, the fluid displacing device capable of displacing the first fluid from a region on the polishing pad; a fluid delivery device capable of replacing the first fluid with a second fluid at the region of the polishing pad, the second fluid being different than the first fluid; a computer; and a sensor capable of being positioned on the wafer carrier.