Diffuser with spiral opening pattern for an electroplating reactor vessel
First Claim
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1. In a reactor for processing a semiconductor wafer, having a vessel, a cup within the vessel for holding a level of process fluid, an anode arranged at a position within the cup, and a wafer support for holding a wafer in the second position spaced from the anode, the improvement comprising:
- a diffusion plate member arranged between the anode and the wafer, said diffusion plate member having a plurality of elongated and curved openings arranged in a spiral pattern, at least a major subset of radially adjacent openings of the plurality of elongated and curved openings having substantially identical arc lengths, said wafer support and said diffusion plate member arranged to be rotated relative to each other about a central axis of the spiral pattern.
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Abstract
In an electroplating reactor for plating a spinning wafer, a diffusion plate is supported above an anode located within a cup filled with process fluid within the reactor. The diffusion plate includes a plurality of openings which are arranged in a spiral pattern. The openings allow for an improved plating thickness distribution on the wafer surface. The openings can be elongated slots curved along the direction of the spiral path.
132 Citations
19 Claims
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1. In a reactor for processing a semiconductor wafer, having a vessel, a cup within the vessel for holding a level of process fluid, an anode arranged at a position within the cup, and a wafer support for holding a wafer in the second position spaced from the anode, the improvement comprising:
a diffusion plate member arranged between the anode and the wafer, said diffusion plate member having a plurality of elongated and curved openings arranged in a spiral pattern, at least a major subset of radially adjacent openings of the plurality of elongated and curved openings having substantially identical arc lengths, said wafer support and said diffusion plate member arranged to be rotated relative to each other about a central axis of the spiral pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A reactor for electroplating a wafer, comprising:
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a vessel;
a rotor having wafer holding structure for holding a wafer within said vessel and a rotary device for spinning the wafer;
a cup for holding a supply of process fluids, said cup held within said vessel;
an anode located within said cup and having a top surface and a bottom surface; and
a diffusion plate member located between said anode and said wafer holding structure, said diffusion plate member having a plurality of elongated and curved holes arranged in a spiral pattern, at least a major subset of radially adjacent holes having substantially identical arc lengths. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. In a reactor for processing a semiconductor wafer, having a vessel, a cup within the vessel for holding a level of process fluid, an anode arranged at a position within the cup, and a wafer support for holding a wafer in the second position spaced from the anode, the improvement comprising:
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a diffusion plate member arranged between the anode and the wafer, said diffusion plate member having a plurality of openings arranged in a spiral pattern, said wafer support and said diffusion plate member arranged to be rotated relative to each other;
a support structure held at an elevation within said vessel, said support structure having plural alternate mounting locations for said diffusion plate member at different vertical positions with respect to said cup, said support structure further comprising a mounting ring having a plurality of annular grooves on an inside surface of said mounting ring at incremental elevations for engaging an edge of said diffusion plate member. - View Dependent Claims (16, 17, 18, 19)
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Specification