Method and apparatus for an improved upper electrode plate in a plasma processing system
First Claim
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1. An upper electrode for a plasma processing system comprising:
- an electrode plate comprising a first surface for coupling said electrode plate to an upper assembly, a second surface comprising a plasma surface configured to face a processing space in said plasma processing system and a mating surface for mating said electrode plate with said plasma processing system, a peripheral edge, and one or more gas injection orifices coupled to said first surface and said second surface and configured to couple a processing gas to said processing space;
a protective barrier coupled to a plurality of exposed surfaces of said electrode plate, said exposed surfaces comprising said plasma surface and said protective barrier being a coating which comprises Yttria; and
a diagnostics port comprising an entrant cavity, and an exit through-hole, wherein said exit through-hole comprises an interior surface, wherein said exposed surfaces further comprise said interior surface of said diagnostics port.
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Abstract
The present invention presents an improved upper electrode for a plasma processing system, wherein the design and fabrication of an electrode plate coupled to an upper assembly advantageously provides gas injection of a process gas with substantially minimal erosion of the electrode plate.
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Citations
56 Claims
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1. An upper electrode for a plasma processing system comprising:
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an electrode plate comprising a first surface for coupling said electrode plate to an upper assembly, a second surface comprising a plasma surface configured to face a processing space in said plasma processing system and a mating surface for mating said electrode plate with said plasma processing system, a peripheral edge, and one or more gas injection orifices coupled to said first surface and said second surface and configured to couple a processing gas to said processing space;
a protective barrier coupled to a plurality of exposed surfaces of said electrode plate, said exposed surfaces comprising said plasma surface and said protective barrier being a coating which comprises Yttria; and
a diagnostics port comprising an entrant cavity, and an exit through-hole, wherein said exit through-hole comprises an interior surface, wherein said exposed surfaces further comprise said interior surface of said diagnostics port. - View Dependent Claims (2, 3, 4, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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- 5. The upper electrode of c1aim 2, wherein said plasma surface further comprises a recess recessed from said first substantially planar surface and radially positioned between said first substantially planar surface and said second substantially planar surface.
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36. An upper electrode for a plasma processing system comprising:
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an electrode plate comprising a first surface for coupling said electrode plate to an upper assembly, a second surface comprising a plasma surface configured to face a processing space in said plasma processing system and a mating surface for mating said electrode plate with said olasma processing system, a peripheral edge. and one or more gas injection orifices coupled to said first surface and said second surface and configured to couple a processing gas to said processing space; and
a protective barrier provided on a plurality of exposed surfaces of said electrode plate, said exposed surfaces comprising said plasma surface, wherein said protective barrier is a coating which comprises Yttria, wherein said first surface comprises;
a plenum recess formed substantially in a center of the first surface to form a plenum cavity that receives said processing gas and distributes said processing gas to said one or more gas injection orifices formed within the plenum recess in the first surface;
a coupling surface extending radially outward from an edge of said plenum recess;
a sealing feature formed in the coupling surface and surrounding said plenum recess; and
a plurality of fastening receptors radially positioned between said sealing feature and said peripheral edge. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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43. An upper electrode for a plasma processing system comprising:
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an electrode elate comprising a first surface for coupling said electrode elate to an upper assembly, a second surface comprising a plasma surface configured to face a processing space in said plasma processing system and a mating surface for mating said electrode plate with said plasma processing system, a peripheral edge, and one or more as injection orifices couvled to said first surface and said second surface and configured to couple a processing gas to said processing space; and
a protective barrier provided on a plurality of exposed surfaces of said electrode plate. said exposed surfaces comprising said plasma surface, wherein said protective barrier is a coating which comprises Yttria wherein;
said mating surface comprises a first substantially planar surface extending radially inward from said peripheral edge; and
said plasma surface compnses a second substantially planar surface radially and axially spaced from said first substantially planar surface, said second substantially planar surface having said one or more gas injection orifices formed therein. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50)
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51. An upper electrode for a plasma processing system comprising:
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an electrode plate comprising a first surface for coupling said electrode plate to an upper assembly, a second surface comprising a plasma surface configured to face a processing space in said plasma processing system and a mating surface for mating said electrode plate with said plasma processing system, a peripheral edge, and one or more gas injection orifices coupled to said first surface and said second surface and configured to couple a processing gas to said processing space; and
a protective barrier provided on a plurality of exposed surfaces of said electrode plate, said exposed surfaces comprising said plasma surface, wherein said protective barrier is a coating which comprises Yttria, wherein said first surface comprises;
a plenum cavity formed substantially in a center of said first surface; and
a coupling surface extending radially outward from an edge of said plenum cavity, wherein;
a surface of said plenum cavity has an anodization layer provided thereon, and said coupling surface does not have said anodization layer provided thereon and does not have said protective barrier provided thereon. - View Dependent Claims (52, 53, 54, 55, 56)
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Specification