Electrostatic chuck having improved electrical connector and method
First Claim
Patent Images
1. An electrostatic chuck for holding a substrate, the electrostatic chuck comprising:
- (a) a dielectric covering an electrode that is chargeable to electrostatically hold the substrate; and
(b) an electrical connector connected to the electrode to conduct an electrical charge to the electrode, the electrical connector comprising a refractory metal having a melting temperature of at least about 1500°
C.
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Abstract
An electrostatic chuck 55 comprises an electrical connector 140 which is connected to the electrode 105 to conduct an electrical charge to the electrode 105. The electrical connector 140 comprises a refractory metal having a melting temperature of at least about 1500° C., such as for example, tungsten, titanium, nickel, tantalum, molybdenum, or alloys thereof. Preferably, the electrical connector 140 is bonded to the electrode 105 by a metal having a softening temperature of less than about 600° C., such as aluminum, indium, or low melting point alloys.
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Citations
13 Claims
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1. An electrostatic chuck for holding a substrate, the electrostatic chuck comprising:
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(a) a dielectric covering an electrode that is chargeable to electrostatically hold the substrate; and
(b) an electrical connector connected to the electrode to conduct an electrical charge to the electrode, the electrical connector comprising a refractory metal having a melting temperature of at least about 1500°
C.- View Dependent Claims (2, 3, 4, 5, 6, 7)
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- 8. An electrostatic chuck for holding a substrate, the electrostatic chuck comprising a dielectric covering an electrode that is chargeable to electrostatically hold the substrate, and an electrical connector electrically connected to the electrode by a metal in a gap between the electrode and the electrical connector, and the electrical connector extending through a bore in the dielectric, the bore comprising a first diameter smaller than a diameter of the electrical connector and a second diameter larger than the diameter of the electrical connector.
Specification