Patent ID: 8776356

Claim:
A method of manufacturing an electrostatic chuck of a stack structure including a metal layer interposed between insulating layers, the method comprising: forming a groove at a peripheral portion of the electrostatic chuck to have a thickness gradually increasing toward an outside of the groove; forming a thermally sprayed insulating film to cover at least a portion of the metal layer exposed at the groove; and grinding the thermally sprayed film such that the thermally sprayed film does not protrude from the groove, wherein upper and lower walls of the groove include upper and lower surfaces of the insulating layers respectively above and below the metal layer, wherein at least one of the upper and lower surfaces of the insulating layers includes at least one of: (a) a curved surface which is curved relative to a top surface of the metal layer, (b) an inclined surface which is inclined relative to the top surface of the metal layer, and wherein the thermally sprayed insulating film covers at least a portion of each of the upper and lower surfaces of the insulating layers in the groove.