Controlling shape of a reticle with low friction film coating at backside
First Claim
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1. A method comprising:
- forming a thin film over a backside of a reticle;
deforming said backside into a global convex shape;
coupling voltage across said thin film; and
conforming said backside of said reticle to a topside of an electrostatic chuck by sliding the reticle across the electrostatic chuck via the thin film.
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Abstract
In an embodiment of the invention, an apparatus includes a reticle having a frontside including a pattern to be imaged onto a semiconductor wafer, a thin film located over a backside of the reticle to form a global convex shape and to reduce friction when sliding on a chuck, and the chuck having a topside to which the backside of the reticle conforms.
6 Citations
18 Claims
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1. A method comprising:
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forming a thin film over a backside of a reticle; deforming said backside into a global convex shape; coupling voltage across said thin film; and conforming said backside of said reticle to a topside of an electrostatic chuck by sliding the reticle across the electrostatic chuck via the thin film. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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coupling a thin film to a concave shaped backside of a reticle, the thin film including a low friction sliding material; applying stress, via the thin film, to the backside of the reticle to deform the backside of the reticle into a convex shaped backside portion and an unflattened backside portion; and coupling the reticle to an electrostatic chuck; wherein coupling the reticle to the chuck includes flattening the unflattened backside portion by coupling voltage across the thin film and sliding the reticle across the chuck via the low friction sliding material. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification