Patent ID: 6821895
Filing Date: 2004-11-23
Classification: B24B,H01L

Abstract:
A method for performing a chemical mechanical polishing (CMP) process on a semiconductor process wafer to compensate in-situ for differing material removal rates comprising the steps of:a) providing at least one slurry feed arm arranged in a first dispensing position for dispensing slurry onto a polishing pad in a CMP process; b) carrying out the CMP process for a predetermined period to remove a portion of a polishing layer comprising a process wafer; c) determining the thickness of the polishing layer at a plurality of predetermined measurement areas comprising at least the process wafer peripheral portion and the process wafer center portion; d) determining a desired subsequent dispensing position in response to the thickness determination to approach a uniform thickness of the polishing layer; and, e) adjusting the slurry feed arm to the subsequent dispensing position comprising one of closer to polishing pad center portion and closer to the polishing pad peripheral portion to compensate for differing material removal rates of the polishing layer.