Patent ID: 6582277
Filing Date: 2003-06-24
Classification: B24B

Abstract:
A method for controlling planarization of a work piece by a processing apparatus comprising a plurality of zones, the rate of removal of material from the work piece surface by the apparatus being a function of pressure applied to the work piece and the pressure applied to the work piece being controlled by the pressure in each of the plurality of zones, the method comprising the steps of:processing a test work piece using initial pressures in each of a plurality of zones to establish an initial pressure distribution profile Pi(x) applied as a function of position (x) on a work piece surface and to achieve an initial removal rate RRi(x) as a function of position (x) on the work piece surface; calculating a removal rate RRf(x) as a function of position (x) on the work piece surface that would result from modifying the pressure in at least one of the plurality of zones to establish a pressure distribution profile Pf(x) as a function of position (x) on the work piece surface, RRf(x) calculated in accordance with the relationship: RRf(x)=RRi(x)*Pf(x)/Pi(x); and planarizing a first work piece using the processing apparatus with pressure in the plurality of zones set to achieve the pressure distribution profile Pt(x).