Patent ID: 8338300
Filing Date: 2012-12-25
Classification: C09G,C09K,H01L

Abstract:
1. A method of chemical mechanical polishing, the method comprising: contacting a titanium nitride (TiN) surface of a semiconductor substrate with a surface of a polishing pad, the semiconductor substrate including silicon nitride (SiN); providing a slurry composition to an interface between the TiN surface of the semiconductor substrate and the surface of the polishing pad, wherein the slurry composition includes a solvent, a polishing agent made of metal oxide, an oxidant, a first polishing inhibitor, wherein the first polishing inhibitor is a phosphate salt including at least one of HPO further wherein based on about 100 wt. % of the slurry composition, the content of the polishing agent is in a range of about 0.01 wt. % to about 1 wt. %, the content of the oxidant is in a range of about 0.5 wt. % to about 5 wt. %, the content of the first polishing inhibitor is in a range of about 0.001 wt. % to about 10 wt. %, the content of the second polishing inhibitor is in a range of about 0.001 wt. % to about 10 wt. %, the content of the dispersion stabilizer is in a range of about 0.001 wt. % to about 10 wt. %, with the solvent being a major component; and rotating the TiN surface of the semiconductor substrate with respect to the surface of the polishing pad to selectively remove at least a portion of TiN faster than SiN.