ELECTROSTATIC CHUCK WITH REDUCED ARCING
First Claim
1. An electrostatic chuck, comprising:
- a body having a notched upper peripheral edge, defined by a first surface perpendicular to a sidewall of the body and a stepped second surface disposed between the first surface and an upper surface of the body, and a plurality of holes disposed through the body along the first surface of the notched upper peripheral edge;
a plurality of fasteners disposed through respective ones of the plurality of holes to couple the body to a base disposed beneath the body;
a dielectric member disposed above the upper surface of the body to electrostatically retain a substrate disposed thereon;
an insulator ring disposed about the body and within the notched upper peripheral edge, the insulator ring having a stepped inner sidewall that mates with the stepped second surface of the notched upper peripheral edge to define a non-linear interface therebetween; and
an edge ring disposed over the insulator ring, wherein the non-linear interface limits arcing between the edge ring and the fastener when RF power is applied to the electrostatic chuck.
1 Assignment
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Accused Products
Abstract
Embodiments of electrostatic chucks are provided herein. In some embodiments, an electrostatic chuck may include a body having a notched upper peripheral edge, defined by a first surface perpendicular to a body sidewall and a stepped second surface disposed between the first surface and a body upper surface, and a plurality of holes disposed through the body along the first surface; a plurality of fasteners disposed through the plurality of holes to couple the body to a base disposed beneath the body; a dielectric member disposed above the body upper surface to electrostatically retain a substrate; an insulator ring disposed about the body within the notched upper peripheral edge and having a stepped inner sidewall that mates with the stepped second surface to define a non-linear interface therebetween; and an edge ring disposed over the insulator ring, the non-linear interface limiting arcing between the edge ring and the fastener.
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Citations
20 Claims
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1. An electrostatic chuck, comprising:
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a body having a notched upper peripheral edge, defined by a first surface perpendicular to a sidewall of the body and a stepped second surface disposed between the first surface and an upper surface of the body, and a plurality of holes disposed through the body along the first surface of the notched upper peripheral edge; a plurality of fasteners disposed through respective ones of the plurality of holes to couple the body to a base disposed beneath the body; a dielectric member disposed above the upper surface of the body to electrostatically retain a substrate disposed thereon; an insulator ring disposed about the body and within the notched upper peripheral edge, the insulator ring having a stepped inner sidewall that mates with the stepped second surface of the notched upper peripheral edge to define a non-linear interface therebetween; and an edge ring disposed over the insulator ring, wherein the non-linear interface limits arcing between the edge ring and the fastener when RF power is applied to the electrostatic chuck. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification