Patent ID: 6743075
Filing Date: 2004-06-01
Classification: B24B,H01L

Abstract:
A method for determining a chemical mechanical polishing time for removing a target polishing thickness H from an uneven surface of a target wafer, the method comprising:polishing a control wafer by a chemical mechanical polishing to obtain a progressive relationship of polishing thickness and respective polishing time therefor; polishing the target wafer by another chemical mechanical polishing to remove a first thickness H1 in a first polishing time T1, in which the first thickness H1 with substantially the uneven surface removed is smaller than the target polishing thickness H of the target wafer to be removed; calculating an image polishing thickness H1â€² to be removed from the control wafer with respect to the first polishing time T1 according to the progressive relationship of the polishing thickness and respective polishing time for the control wafer; adding a second polishing thickness H2=(Hâˆ’H1) to the image polishing thickness H1â€² to obtain an equivalent polishing thickness Hâ€² for the control wafer; and determining a target polishing time for removing the target polishing thickness H from the target wafer by interpolating the progressive relationship of the polishing thickness and respective polishing time for the control wafer based on the equivalent polishing thickness Hâ€².