Apparatus for etching high aspect ratio features
First Claim
Patent Images
1. A showerhead assembly, comprising:
- an upper section having a top surface, a bottom surface and a plurality of gas flow passages extending from the top surface to the bottom surface, and the upper section separating an upper plenum above the top surface from a lower plenum below the bottom surface;
a gas distribution plate having an upper surface, wherein the upper surface is mechanically coupled to the bottom surface of the upper section, and the gas distribution plate has a plurality of gas flow holes fluidly coupled to the lower plenum; and
a member disposed over the gas distribution plate, wherein a plurality of holes are formed through the member defining an optically transmissive passage though the upper section and the gas distribution plate.
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Abstract
Embodiments of the invention provide a method and apparatus, such as a processing chamber, suitable for etching high aspect ratio features. Other embodiments include a showerhead assembly for use in the processing chamber. In one embodiment, a processing chamber includes a chamber body having a showerhead assembly and substrate support disposed therein. The showerhead assembly includes at least two fluidly isolated plenums, a region transmissive to an optical metrology signal, and a plurality of gas passages formed through the showerhead assembly fluidly coupling the plenums to the interior volume of the chamber body.
54 Citations
17 Claims
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1. A showerhead assembly, comprising:
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an upper section having a top surface, a bottom surface and a plurality of gas flow passages extending from the top surface to the bottom surface, and the upper section separating an upper plenum above the top surface from a lower plenum below the bottom surface; a gas distribution plate having an upper surface, wherein the upper surface is mechanically coupled to the bottom surface of the upper section, and the gas distribution plate has a plurality of gas flow holes fluidly coupled to the lower plenum; and a member disposed over the gas distribution plate, wherein a plurality of holes are formed through the member defining an optically transmissive passage though the upper section and the gas distribution plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A showerhead assembly, comprising:
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an upper section having a plurality of gas flow passages and the upper section separating an upper plenum from a lower plenum; a gas distribution plate coupled to a bottom surface of the upper section and having a plurality of gas flow holes fluidly coupled to the lower plenum; and an optically transmissive passage defined though the upper section and the gas distribution plate, wherein the optically transmissive passage further comprises; a sealed window; a member disposed between the window and the gas distribution plate; and a plurality of high aspect ratio holes formed in the member. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A showerhead assembly, comprising:
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a base having a stepped recess; a first plate disposed in the recess; a second plate disposed in the recess between the first plate and the base; a ceramic plug having a plurality of high aspect ratio holes formed therethrough, the high aspect ratio holes have a diameter less than about 1.5 mm and an aspect ratio (height to diameter) of at least about 10;
1;a barrier wall disposed between the first and second plates and separating a first and second plenums defined between the first and second plates; a gas distribution plate coupled to the first plate by a plurality of concentric adhesive lines and having a plurality of gas flow holes aligned between adhesive lines; and an optically transmissive passage defined though the base, first and second plates, ceramic plug, and gas distribution plate.
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Specification