Patent ID: 7025662

Claim:
A chemical-mechanical polishing tool for chemical-mechanical polishing a surface on a wafer, comprising: a polishing pad, a drive unit, a pressing means, a wafer holder, a first dispensing means and second dispensing means; the wafer holder disposed at a holder location (L 0 ); the pressing means adapted to press the wafer holder to the polishing pad; the first dispensing means adapted to dispense a first fluid on the polishing pad and disposed at a first dispensing means location (L 1 ); the second dispensing means adapted to dispense a second fluid on the polishing pad and disposed at a second dispensing means location (L 2 ); the polishing pad comprising a polishing surface for polishing the wafer, and the polishing pad further connected to the drive unit for moving the polishing surface in a first direction (ω 1 ) relative to the holder location (L 0 ); wherein the first dispensing means location (L 1 ) is in a downstream direction with respect to the holder location (L 0 ) at a first downstream distance (d 1 ), with the downstream direction being taken in relation to the first direction (ω 1 ), and the second dispensing means location (L 2 ) is in an upstream direction with respect to the holder location (L 0 ) at a first upstream distance (d 3 ), with the upstream direction being taken in relation to the first direction (ω 1 ); and wherein a radial distance between the first dispensing means location (L 1 ) and the second dispensing means location (L 2 ) in a downstream direction is greater than a radial distance between the first dispensing means location (L 1 ) and the second dispensing means location (L 2 ) in the upstream direction.