Showerhead Coupling Geometry for Precise Assembly and Etch Yield
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Solution Overview
Problem
Showerheads in semiconductor fabrication processes face challenges in longevity, assembly efficiency, and substrate etching yield due to gas hole deformation and particle formation during etching processes.
Innovation Solution
A showerhead design featuring an inner plate with a disk-shaped central member and a ring-shaped coupling member, combined with an outer plate that includes a ring-shaped coupling member, allows for accurate assembly and maintains a specific distance between gas holes and the outer surface, preventing deformation and enhancing etching yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional showerhead design is used, then the assembly process is simple, but the assembly precision and accuracy are insufficient
Solution Approach 1:
The coupling member features an asymmetric inclined outer surface that contacts the inner surface of the outer ring body at a specific angle. This asymmetric geometry enables precise positioning and accurate assembly of the showerhead components, resolving the contradiction between assembly precision and structural complexity.
2Productivity
If the gas hole is positioned close to the outer surface, then the etching efficiency is improved, but the gas hole deforms during etching process
Solution Approach 1:
The design optimizes the local geometry of the gas hole by positioning it at a specific distance (2.5-8 mm) from the outer surface of the central member. This localized structural adjustment prevents gas hole deformation during etching while maintaining adequate etching efficiency, resolving the contradiction between productivity and reliability.
3Productivity
If the showerhead operates for extended period, then the production output increases, but the showerhead lifetime decreases due to deformation
Solution Approach 1:
The inclined outer surface of the coupling member is designed in advance to provide preliminary positioning and support. This pre-configured structural feature prevents deformation during extended operation, thereby extending showerhead lifetime while maintaining production output.
4Loss of time
If the assembly is performed quickly, then the production time is reduced, but the assembly accuracy deteriorates
Solution Approach 1:
The inclined outer surface of the coupling member enables self-positioning and self-alignment during assembly. This self-service mechanism allows rapid assembly without sacrificing accuracy, as the geometry automatically guides the components into the correct position.
Data Source
AI summary
The present disclosure relates to showerheads, substrate processing apparatuses, and semiconductor fabrication methods. One example showerhead comprises an inner plate, and an outer plate combined with the inner plate and surrounding the inner plate. The inner plate includes a disk-shaped central member that comprises a gas hole extending in a first direction, and a ring-shaped first coupling member outside the central member and surrounding the central member. The outer plate includes an outer ring body and a ring-shaped second coupling member inside the outer ring body. A bottom surface of the first coupling member is in contact with a top surface of the second coupling member. A first angle between the first direction and an outer surface of the first coupling member is different from a second angle between the first direction and an inner surface of the outer ring body.