Patent ID: 11931853
Assignee: APPLIED MATERIALS, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G  H | IPC B  G

Claim 15:
16. A polishing system, comprising:
a platen to support a polishing pad;
a carrier head to hold a substrate against the polishing pad, the carrier head including a plurality of pressurizable chambers spaced angularly around an axis of rotation of the carrier head; and
a controller configured to
receive a target removal profile that includes a target thickness to remove for a plurality of locations on a substrate that are angularly distributed around a center of the substrate,
store a first function defining a polishing rate for each zone of a plurality of pressurizable zones of the carrier head that are angularly distributed at different angular positions around a center of the carrier head, the first function defining the polishing rate for the zone as a function of one or more pressures of one or more chambers from the plurality of pressurizable chambers of the carrier head, and
for each particular zone of the plurality of zones, calculate a recipe defining a pressure for the particular zone over time by calculating an expected thickness profile after polishing using the first function and minimizing a cost function that incorporates a first term representing a difference between the expected thickness profile and a target thickness profile, wherein an output of the minimization of the cost function is a scalar quantity representing a summed removal error.