Patent ID: 7400934
Filing Date: 2008-07-15
Classification: B24B

Abstract:
1. A computer program product comprising: a computer-readable medium having stored thereon instructions which, when executed by a processor in a chemical mechanical polishing system, causes the system to perform the operations of: polishing a first wafer from a plurality of wafers using a set of polishing parameters; measuring the profile of the first polished wafer, the profile including at least a first measurement of dielectric thickness in a first array, a second measurement of dielectric thickness in a second array, a first measurement of dielectric thickness in a first field, and a second measurement of dielectric thickness in a second field, where the first array is proximate to the first field and the second field is proximate to the second array; determining a first erosion measurement and a second erosion measurement, where the first erosion measurement is a difference between the first dielectric thickness in the first field and the first dielectric thickness in the first array and the second erosion measurement is a difference between the second dielectric thickness in the second field and the second dielectric thickness in the second array; calculating a new polishing parameter from the measurement of the profile of the first wafer using the first and second dielectric thicknesses in the first and second arrays and the first and second erosion measurements; and using the new polishing parameter to polish a subsequent wafer.