Patent ID: 8774958
Filing Date: 2014-07-08
Classification: B24B,G05B,G05D

Abstract:
1. A method of selecting values for a plurality of independently controllable chamber pressures of a carrier head in a chemical mechanical polishing system, the carrier head including a plurality of chambers to apply the independently controllable chamber pressures to a plurality of corresponding zones on a substrate, comprising: for each chamber and corresponding zone, storing data relating variation in removal profile on a front surface of the substrate to variation in the controllable chamber pressure of the chamber, the data including removal at a plurality of positions on the front surface of the substrate, there being a greater number of positions than chambers, the plurality of positions including positions inside the corresponding zone and positions outside the corresponding zone; determining a value of a chamber pressure for each chamber of the plurality of controllable chambers to minimize a difference between a target removal profile and an expected removal profile calculated from the data relating variation in removal profile on a front surface of the substrate to variation in the chamber pressure for each chamber such that an expected removal rate for at least some positions within a zone from the plurality of zones includes an effect of the chamber pressure for the chamber corresponding to the zone and an effect of the chamber pressure for a chamber that does not correspond to the zone; and storing the value for each chamber pressure of the plurality of controllable chamber pressures.