Patent ID: 6612903
Filing Date: 2003-09-02
Classification: B24B

Abstract:
A method of planarizing a wafer comprising the steps of:a) loading an incoming wafer into a carrier having a plurality of pressure adjustable concentric plenums and a pressure adjustable concentric barrier between every pair of neighboring plenums; b) moving the carrier until the wafer is near or touches an abrasive surface; c) determining a desired removal rate for a plurality of concentric zones on the wafer that correspond to the plurality of concentric plenums of the carrier; d) pressing the wafer against the abrasive surface by pressurizing each concentric plenum of the carrier to correspond to a desired removal rate of material on a particular concentric zone on the wafer; e) adjusting the pressure on each of the plurality of barriers between concentric plenums; and f) causing relative motion between the wafer and the abrasive surface to planarize the wafer.