Patent ID: 11865671
Assignee: APPLIED MATERIALS, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 11:
12. A chemical mechanical polishing apparatus comprising:
a rotatable platen to hold a polishing pad, the platen rotatable by a motor;
a carrier head to hold a substrate against a polishing surface of the polishing pad during a polishing process, the carrier head laterally movable by a first actuator across the polishing pad and rotatable by a second actuator;
a thermal control system including one or more independently controllable heaters and/or coolers to independently control temperatures of a zone on the polishing pad; and
a controller configured to cause the thermal control system to intermittently apply heat or cooling to a zone of polishing pad as the zone of the polishing pad rotates below the one or more heaters or coolers so as generate an annular area at a common radial distance from an axis of rotation of the platen that has alternating first and second regions of different temperatures, the controller further configured to
control the motor and the thermal control system to synchronize heating and cooling of the zone of the polishing pad with rotation of the carrier head such that over each of a plurality of successive rotations of the carrier head, a first angular swath of an annular edge portion of the substrate overlies the first region when the first angular swath is at an azimuthal angle about an axis of rotation of the carrier head, and when a second angular swath of the annular edge portion of the substrate is at the azimuthal angle, the second angular swath overlies the second region.