Patent ID: 8758090

Claim:
A polishing method, comprising: mounting a wafer on a fixed abrasive polishing pad located on a polishing platen; delivering a polishing slurry to the fixed abrasive polishing pad to polish the wafer; providing a polarity changer having an electrode mounted at one end of the polarity changer, wherein the polarity changer allows the electrode to have a polarity reversible between being positively charged and being negatively charged; moving the polarity changer relatively to the polishing platen to a position above the fixed abrasive polishing pad, such that a region in the polishing slurry is scanned by the electrode when moving the polarity changer; and adsorbing, when the region in the polishing slurry is scanned by the electrode, abrasive particles generated during the polishing process with the electrode, wherein the electrode is in contact with the polishing slurry and has the polarity opposite to a polarity of charges of the abrasive particles.