Method and apparatus of eddy current monitoring for chemical mechanical polishing
First Claim
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1. A polishing system, comprising:
- a polishing pad having a polishing surface;
a carrier to hold a substrate against the polishing surface of the polishing pad; and
an eddy current monitoring system including an induction coil positioned on a side of the polishing surface opposite the substrate, the induction coil extending at least partially through the polishing pad.
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Abstract
A polishing system can have a rotatable platen, a polishing pad secured to the platen, a carrier head to hold a substrate against the polishing pad, and an eddy current monitoring system including a coil or ferromagnetic body that extends at least partially through the polishing pad. A polishing pad can have a polishing layer and a coil or ferromagnetic body secured to the polishing layer. Recesses can be formed in a transparent window in the polishing pad.
112 Citations
18 Claims
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1. A polishing system, comprising:
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a polishing pad having a polishing surface;
a carrier to hold a substrate against the polishing surface of the polishing pad; and
an eddy current monitoring system including an induction coil positioned on a side of the polishing surface opposite the substrate, the induction coil extending at least partially through the polishing pad. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A polishing system, comprising:
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a polishing pad having a polishing surface;
a solid window situated at least partially in the polishing pad, the window having a recess;
a platen to which the polishing pad is attached;
a carrier to hold a substrate against the polishing surface of the polishing pad; and
an eddy current monitoring system including a ferromagnetic body positioned on a side of the polishing surface opposite the substrate, the ferromagnetic body extending at least partially through the polishing pad and partially into the recess, the ferromagnetic body being supported by the platen, wherein a gap separates the ferromagnetic body from the polishing pad. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A polishing system, comprising:
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a polishing pad having a polishing surface;
a solid window situated at least partially in the polishing pad, the window having a recess;
a platen to which the polishing pad is secured;
a carrier to hold a substrate against the polishing surface of the polishing pad; and
an eddy current monitoring system including a core and a ferromagnetic body that is positioned on a side of the polishing surface opposite the substrate, the ferromagnetic body extending at least partially through the polishing pad and at least partially into the recess, the core being aligned with the ferromagnetic body when the polishing pad is attached to the platen. - View Dependent Claims (16, 17, 18)
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Specification