Methods for producing in-situ grooves in chemical mechanical planarization (CMP) pads, and novel CMP pad designs
View Patent ↗Methods for producing in-situ grooves in CMP pads are provided. In general, the methods for producing in-situ grooves comprise the steps of patterning a silicone lining, placing the silicone lining in, or on, a mold, adding CMP pad material to the silicone lining, and allowing the CMP pad to solidify. CMP pads comprising novel groove designs are also described. For example, described here are CMP pads comprising concentric circular grooves and axially curved grooves, reverse logarithmic grooves, overlapping circular grooves, lassajous groves, double spiral grooves, and multiply overlapping axially curved grooves. The CMP pads may be made from polyurethane, and the grooves produced therein may be made by a method from the group consisting of silicone lining, laser writing, water jet cutting, 3-D printing, thermoforming, vacuum forming, micro-contact printing, hot stamping, and mixtures thereof.
1. A CMP pad comprising:
concentric circular grooves in a first region of the pad and in a second region of the pad adjacent to the first region and radiating grooves which radiate linearly in the first region of the pad and are curved in the second region of the pad,
wherein the radiating grooves cross the concentric circular grooves and wherein the first region is closer than the second region, to a central axis of the pad.
2. The CMP pad of claim 1 wherein the CMP pad is made from polyurethane.
3. The CMP pad of claim 1 wherein the grooves are produced by a method from the group consisting of silicone lining, laser writing, water jet cuffing, 3-D printing, thermoforming, vacuum forming, micro-contact printing, hot stamping, and mixtures thereof.
4. The CMP pad of claim 1 wherein the radiating grooves are continuous.
5. The CMP pad of claim 4 wherein the CMP pad is made from polyurethane.
6. The CMP pad of claim 5 wherein the circular grooves occupy a majority of a surface of the pad.
7. The CMP pad of claim 6 wherein the radiating grooves traverse a majority of the surface.