METHODS FOR PRODUCING IN-SITU GROOVES IN CHEMICAL MECHANICAL PLANARIZATION (CMP) PADS, AND NOVEL CMP PAD DESIGNS
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 overlapping circular grooves.
2 . The CMP pad of claim 1 wherein the overlapping circular grooves are off-center.
3 . The CMP pad of claim 1 wherein the CMP pad is made from polyurethane.
4 . 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 cutting, 3-D printing, thermoforming, vacuum forming, micro-contact printing, hot stamping, and mixtures thereof.
5 . A CMP pad comprising lassajous groves.
6 . The CMP pad of claim 5 wherein the CMP pad is made from polyurethane.
7 . The CMP pad of claim 5 wherein the grooves are produced 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.
8 . A CMP pad comprising double spiral grooves.
9 . The CMP pad of claim 8 wherein the CMP pad is made from polyurethane.
10 . The CMP pad of claim 8 wherein the grooves are produced 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.
11 . A CMP pad comprising multiply overlapping axially curved grooves.
12 . The CMP pad of claim 11 wherein the CMP pad is made from polyurethane.
13 . The CMP pad of claim 11 wherein the grooves are produced 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.