Patent ID: 9543187
Date: 2017-01-10
CPC Classifications: H01L,H02N

Claim:
1. An electrostatic chuck comprising: an electrode; and a surface layer activated by a voltage in the electrode to form an electric charge to electrostatically clamp a substrate to the electrostatic chuck, the surface layer including: (i) a dielectric comprising a resistivity greater than about 10 (ii) a charge control surface layer coating overlying the dielectric and comprising a thickness in the range of from about 0.1 microns to about 10 microns and a surface resistivity in the range of from about 1×10 the charge control surface layer comprising a surface coating layer comprising portions of the surface layer surrounding the protrusions, above which the protrusions extend; and wherein the protrusions include modified edge geometry such that a ratio of a characteristic rounding height of a protrusion to a characteristic rounding length is equal to a given ratio, wherein the given ratio is between about 0.00611 and about 0.002444.