Baffled liner cover
First Claim
1. A liner assembly for use in a thermal processing furnace, comprising:
- a generally tubular liner having sides extending along a central axis for accommodating a tower supporting a plurality of wafers in a horizontal orientation; and
a cover disposed at least partially over a top of the liner having convolute passageways passing therethrough, part of the passageways extending perpendicular to the central axis and another part of the passageways extending parallel to the central axis, wherein the cover includes an outer annular portion supported on the liner and a central part having an inner annular portion fit into a central aperture of the outer annular portion, and a floor member having an upwardly extending rim forming an inverted cup shape, and the passageways penetrating sidewalls of the central part and passing in between the central part and the upwardly extending rim.
6 Assignments
0 Petitions
Accused Products
Abstract
A baffled liner cover supported at the top of a liner surrounding a wafer support tower for semiconductor thermal processing. The cover may present a continuous horizontal surface for preventing particles from falling within the liner but present horizontal extending gas passageways in a baffle assembly to allow the flow of processing gas through the cover. In one embodiment, the baffle assembly includes a cup-shaped member disposed in a central aperture of a top plate having an open top, a continuous bottom, horizontal holes through the sides, and a flange around sides defining a convolute annular passage. Alternatively, the planar top plate may included slanted holes therethrough or vertical holes occupying a small fraction of the surface area. The liner and cover may be composed of quartz, silicon carbide, or preferably silicon.
336 Citations
16 Claims
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1. A liner assembly for use in a thermal processing furnace, comprising:
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a generally tubular liner having sides extending along a central axis for accommodating a tower supporting a plurality of wafers in a horizontal orientation; and a cover disposed at least partially over a top of the liner having convolute passageways passing therethrough, part of the passageways extending perpendicular to the central axis and another part of the passageways extending parallel to the central axis, wherein the cover includes an outer annular portion supported on the liner and a central part having an inner annular portion fit into a central aperture of the outer annular portion, and a floor member having an upwardly extending rim forming an inverted cup shape, and the passageways penetrating sidewalls of the central part and passing in between the central part and the upwardly extending rim. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A baffled liner cover to be fit over the top of a tubular liner configured to accommodate within the liner a substrate support tower, comprising:
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a cover plate extending in a plane about an axis and having peripheral edges to be supported on the liner and having a central aperture; a baffle assembly having an annular portion at its top fit to the aperture, a generally tubular wall open at its top in a plane of the cover plate, extending parallel to the axis, and having horizontal passageways therethrough, and supporting at its bottom a continuous floor extending perpendicularly to and radially outwardly from the axis, the floor having an upwardly extending rim, and a convolute gas passageway joined to the horizontal passageways formed in between the tubular wall and the cover plate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification