Patent ID: 8669540
Filing Date: 2014-03-11
Classification: H01L

Abstract:
1. An electrostatic clamp, comprising: a heating block for heating a substrate, the heating block having a first surface disposed toward the substrate and a second surface opposite the first surface; and a base arranged to adjoin at least a portion of the second surface of the heating block; the adjoined base and heating block mutually defining: an inner gap between a first portion of the heating block and the base; an outer gap concentric with the inner gap and arranged between a second portion of the heating block and the base, the inner and outer gaps being isolated from one another by a first sealing surface formed between the second surface of the heating block and the base; a first annular portion protruding above the first surface of the heating block, the first annular portion having a third sealing surface for engaging the substrate; and a second annular portion protruding above the first surface of the heating block and having a fourth sealing surface for engaging the substrate, wherein the first annular portion defines an inner compartment and the first and second annular portion together define an outer compartment concentric with the inner compartment when the substrate is engaged with the first and second sealing surfaces; and a gas inlet communicating with the inner compartment to provide a gas between the first surface of the heating block and the substrate.