Patent ID: 11883923
Assignee: APPLIED MATERIALS, INC.
Field: nan (nan)
Classification: CPC nan | IPC B  H

Claim 7:
8. A polishing system, comprising:
a platen rotatable about an axis;
a polishing pad having a polishing-control groove that is concentric with the axis of rotation and a polishing surface having a plurality of slurry-supply grooves, wherein the slurry-supply grooves are narrower than the polishing-control groove, and wherein the slurry-supply grooves surround the polishing-control groove;
a carrier head to hold a substrate against the polishing pad, the carrier head radially movable across the polishing pad;
an actuator to move the carrier head; and
a controller coupled to the actuator and configured to cause the carrier head to
for a first duration, oscillate the substrate laterally across the polishing pad such that a central portion of the substrate and an edge portion of the substrate are positioned over the polishing surface of the polishing pad, and
for a second duration, hold the substrate in a position such that the central portion of the substrate is positioned only over the polishing surface of the polishing pad and the polishing-control groove is positioned under only an arcuate region of the edge portion of the substrate for a second duration such that the central portion of the substrate is preferentially polished during the second duration.