Workpiece polishing apparatus comprising a fluid pressure bag provided between a pressing surface and the workpiece and method of use thereof

摘要

A polishing apparatus is used for polishing a workpiece such as a semiconductor wafer to a flat mirror finish. The polishing apparatus comprises a turntable having a polishing surface, a top ring for holding a workpiece and pressing the workpiece against the polishing surface, a holding surface of the top ring for holding the workpiece, and a retainer ring for retaining the workpiece within the holding surface of the top ring. The holding surface is deformable by fluid having variable pressure, and the retainer ring presses the polishing surface under a variable pressing force.