Patent ID: 8980113
Filing Date: 2015-03-17
Classification: B24B,C01B,C01P,C09G,C09K,H01L

Abstract:
1. A chemical mechanical polishing slurry for polishing a GaN substrate, comprising: at least 80 wt % water; ultra dispersed diamond (UDD) dispersed within the water, the UDD being present in an amount of at least 0.01 wt % and not greater than 5 wt % and having an average primary particle size not greater than 10.0 nm, a density of between 2.8 g/cm a complexing agent in an amount of at least about 500 ppm and not greater than 1000 ppm; and a passivating agent in an amount of at least 50 ppm and not greater than 500 ppm, wherein the chemical mechanical polishing slurry is capable of polishing the GaN substrate with a removal rate of at least about 15 Å/min while achieving a GaN surface roughness Ra of not greater than about 4.5 Å.