Patent ID: 8619406

Claim:
A substrate support comprising (i) a base body; (ii) one or more conductive members disposed on or within the base body; and (iii) a dielectric multilayer formed on at least a portion of the base body, or on the one or more conductive members disposed on the base body and at least a portion of the base body; wherein the dielectric multilayer comprises (a) an undercoat dielectric layer comprising a metal oxide or metal nitride formed on at least a portion of the base body, or on the one or more conductive members disposed on the base body and at least a portion of the base body; and (b) a topcoat dielectric layer comprising a metal oxide formed on the undercoat dielectric layer; wherein (iâ€²) the topcoat dielectric layer has an aluminum oxide content of less than about 1 weight percent, and (iiâ€²) the topcoat dielectric layer has a corrosion resistance and/or plasma erosion resistance greater than the corrosion resistance and/or plasma erosion resistance of the undercoat dielectric layer, and wherein the topcoat dielectric layer has a lower porosity than the undercoat dielectric layer.