HIGH TEMPERATURE CATHODE FOR PLASMA ETCHING
First Claim
Patent Images
1. A plasma processing cathode comprising:
- a base having cooling conduits formed therein;
a ceramic electrostatic chuck secured to the base; and
a rigid support ring disposed between the electrostatic chuck and the base, the support ring maintaining the electrostatic chuck to the base in a spaced-apart relation.
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Abstract
The present invention generally is a cathode suitable for use in high temperature plasma etch applications. In one embodiment, the cathode includes a ceramic electrostatic chuck secured to a base. The base has cooling conduits formed therein. A rigid support ring is disposed between the chuck and the base, thereby maintaining the chuck and the base in a spaced-apart relation.
164 Citations
20 Claims
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1. A plasma processing cathode comprising:
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a base having cooling conduits formed therein; a ceramic electrostatic chuck secured to the base; and a rigid support ring disposed between the electrostatic chuck and the base, the support ring maintaining the electrostatic chuck to the base in a spaced-apart relation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A plasma processing cathode comprising:
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a base having cooling conduits formed therein; a ceramic electrostatic chuck disposed on the base, the electrostatic chuck having a plurality of gas feeds extending from a bottom surface of the electrostatic chuck facing the base to a top surface the electrostatic chuck; a rigid support ring disposed between the electrostatic chuck and the base, the support ring maintaining the bottom of the electrostatic chuck and the base in a spaced-apart relation; a fluid distribution ring disposed between the base and the electrostatic chuck, a bottom of the fluid distribution ring spaced from the base to define an annular channel, the fluid distribution ring having a plurality of gas passages configured to direct gas through the fluid distribution ring from the channel to the electrostatic chuck; and ceramic baffles disposed in the gas passages. - View Dependent Claims (13, 14, 15, 16)
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17. A plasma processing cathode comprising:
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a base having cooling conduits formed therein; a ceramic electrostatic chuck secured to a top surface of the base; a rigid support ring disposed between the electrostatic chuck and the base, the support ring maintaining a lower surface of the electrostatic chuck spaced-apart from the top surface of the base; a flat annular spreader plate disposed radially inward of the support ring in a gap defined between the lower surface of the electrostatic chuck and the upper surface of the base; and a seal providing seal between the electrostatic chuck and the base outward of the spreader plate, the seal sealingly permitting radial movement of the electrostatic chuck relative to the plate. - View Dependent Claims (18, 19, 20)
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Specification