Detachable electrostatic chuck having sealing assembly
First Claim
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1. A detachable electrostatic chuck for attachment to a pedestal in a process chamber, the detachable electrostatic chuck comprising:
- (a) an electrostatic puck comprising a ceramic body having an embedded electrode, a substrate receiving surface, and an annular flange;
(b) a baseplate below the electrostatic puck, the baseplate having a peripheral ledge extending beyond the annular flange of the ceramic body, and a bottom surface; and
(c) a sealing assembly comprising a sealing plate and a concentric sealing ring, the sealing assembly being bonded to the bottom surface of the baseplate.
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Abstract
A detachable electrostatic chuck is capable of being attached to a pedestal in a process chamber. The chuck comprises an electrostatic puck having a ceramic body with an embedded electrode. The chuck also has a baseplate below the electrostatic puck with a lower surface which is bonded to a sealing assembly comprising a sealing plate and sealing ring. The sealing plate and ring are polished to form a gas-tight seal between the chuck and pedestal to prevent gas leakage from or into this region.
126 Citations
38 Claims
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1. A detachable electrostatic chuck for attachment to a pedestal in a process chamber, the detachable electrostatic chuck comprising:
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(a) an electrostatic puck comprising a ceramic body having an embedded electrode, a substrate receiving surface, and an annular flange; (b) a baseplate below the electrostatic puck, the baseplate having a peripheral ledge extending beyond the annular flange of the ceramic body, and a bottom surface; and (c) a sealing assembly comprising a sealing plate and a concentric sealing ring, the sealing assembly being bonded to the bottom surface of the baseplate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 31, 32, 33, 34, 35, 36)
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18. A method of fabricating an electrostatic chuck, the method comprising the steps of:
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(a) forming an electrostatic puck comprising a ceramic body with an embedded electrode, the ceramic body having a substrate receiving surface, a bottom surface, and an annular flange; (b) forming a baseplate comprising a porous ceramic having a peripheral ledge, top surface, and bottom surface; (c) forming a sealing assembly comprising a sealing plate and a sealing ring; (d) holding (i) the top surface of the baseplate against the bottom surface of the electrostatic puck so that the peripheral ledge of the baseplate extends beyond the annular flange of the ceramic body of the electrostatic puck, and (ii) the sealing assembly positioned against the bottom surface of the baseplate; (e) infiltrating molten metal into the porous ceramic of the baseplate and between the gaps of the ceramic body, baseplate, and sealing assembly, to; (i) bond the ceramic body to the baseplate with a metal bond; (ii) infiltrate the porous ceramic of the baseplate with the metal; and (iii) bond the sealing assembly to the to the bottom surface of the baseplate. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A sealing assembly for forming a gas tight seal between an electrostatic chuck and a pedestal in a process chamber, the sealing ring comprising:
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(a) a sealing plate that is D-shaped with a flat edge connected to a semicircular perimeter; and (b) a sealing ring comprising a circular ring which is concentric to the sealing plate, wherein the sealing plate and sealing ring each comprise a surface flatness of less than about 200 microns. - View Dependent Claims (27, 28, 29, 30)
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37. A detachable electrostatic chuck for attachment to a pedestal in a process chamber, the detachable electrostatic chuck comprising:
- (a) an electrostatic puck comprising a ceramic body having an embedded electrode, a substrate receiving surface, and an annular flange;
(b) a baseplate below the electrostatic puck, the baseplate having a peripheral ledge extending beyond the annular flange of the ceramic body, and a bottom surface, the baseplate comprising aluminum; and
(c) a sealing assembly comprising a sealing plate and a concentric sealing ring, the sealing assembly being bonded to the bottom surface of the baseplate. - View Dependent Claims (38)
- (a) an electrostatic puck comprising a ceramic body having an embedded electrode, a substrate receiving surface, and an annular flange;
Specification