EMBOSSED ELECTROSTATIC CHUCK
First Claim
1. An electrostatic chuck comprising:
- a layer having a plurality of protrusions to support a workpiece, wherein at least a portion of the layer has a first plurality of the plurality of protrusions, the first plurality of protrusions spaced to geometrically form a pattern of hexagons.
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Accused Products
Abstract
An electrostatic chuck includes a layer having a plurality of protrusions to support a workpiece, wherein at least a portion of the layer has a first plurality of the plurality of protrusions. The first plurality of protrusions is spaced to geometrically form a pattern of hexagons. The first plurality of protrusions may be spaced an equal distance from adjacent protrusions and the equal distance may be about 4.0 millimeters from a center of one protrusion to a center of another protrusion. The present disclosure reduces peak mechanical stress levels conventionally present along an edge of each protrusion. Reducing such mechanical stress levels helps reduce backside damage to a supported workpiece, which in turn can reduce the generation of unwanted particles caused by such damage.
342 Citations
18 Claims
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1. An electrostatic chuck comprising:
a layer having a plurality of protrusions to support a workpiece, wherein at least a portion of the layer has a first plurality of the plurality of protrusions, the first plurality of protrusions spaced to geometrically form a pattern of hexagons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A processing apparatus comprising:
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a process chamber; and an electrostatic chuck positioned within the process chamber, the electrostatic chuck having a plurality of protrusions to support a workpiece for processing, wherein at least a portion of the layer has a first plurality of the plurality of protrusions, the first plurality of protrusions spaced to geometrically form a pattern of hexagons. - View Dependent Claims (14, 18)
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15. The processing apparatus 13, wherein the first plurality of protrusions is further spaced to geometrically form a pattern of equilateral triangles wherein select groupings of six of the equilateral triangles have a common vertex to form one hexagon of the pattern of hexagons.
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16. The processing apparatus 15, wherein each one of the first plurality of protrusions is spaced an equal distance from adjacent ones of the first plurality of protrusions and the equal distance is about 4.0 millimeters from a center of one protrusion to a center of another protrusion.
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17. The processing apparatus 16, wherein the first plurality of protrusions have a circular contact area to contact a backside of the workpiece in a clamped position, and wherein a diameter of the circular planar contact area is greater than or equal to about 0.75 millimeters.
Specification