Semiconductor Showerhead Spiral Passages for Multi-Gas Purity
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Solution Overview
Problem
Conventional semiconductor processing tools face challenges in efficiently distributing multiple process gases while preventing particulate contamination due to sharp interior corners and rough surface finishes in gas distribution systems, which can lead to wafer contamination.
Innovation Solution
The use of additive manufacturing techniques to create showerheads with internal spiral passages and rounded transitions between sidewalls and internal surfaces, along with post-manufacturing polishing, to ensure smooth gas flow and reduce particulate trapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gas distribution systems are used with straight passages and sharp corners, then manufacturing is simpler, but particulate contamination occurs due to trapped particles in sharp interior corners
Solution Approach 1:
The patent applies curvature by replacing sharp corners and straight passages with spiral passages that have continuously rounded transitions. The spiral geometry eliminates sharp interior corners where particles could become trapped, while the rounded transitions maintain smooth gas flow. This curved geometry is achieved through additive manufacturing, which can create complex three-dimensional spiral structures that would be difficult to manufacture using conventional methods.
2Productivity
If multiple process gases are distributed simultaneously, then processing efficiency increases, but gas distribution uniformity decreases due to flow interference
Solution Approach 1:
The patent segments the gas distribution system into multiple independent spiral passages, each dedicated to distributing a specific process gas. This segmentation allows each gas to flow through its own dedicated spiral path without interference from other gases, maintaining uniform distribution while enabling simultaneous delivery of multiple gases. The spiral geometry within each passage ensures consistent flow patterns.
Solution Approach 2:
The patent transitions from conventional straight or radial gas distribution passages to three-dimensional spiral passages that wind through the showerhead body. This dimensional change creates a more complex flow path that promotes uniform gas distribution across the substrate surface, reducing flow interference effects while maintaining high productivity through simultaneous multi-gas delivery.
3Reliability
If additive manufacturing is used to create spiral passages with rounded transitions, then gas flow smoothness improves, but manufacturing complexity increases
Solution Approach 1:
The patent replaces conventional mechanical manufacturing methods (such as machining or molding) with additive manufacturing technology. This substitution enables the creation of complex spiral passages with rounded transitions that would be difficult or impossible to produce using traditional subtractive or formative manufacturing methods. The additive process builds the structure layer by layer, naturally creating smooth transitions and eliminating sharp corners.
Solution Approach 2:
The patent changes the manufacturing approach from conventional methods to additive manufacturing, which fundamentally alters how the spiral passages are created. This parameter change in the manufacturing process enables the realization of complex geometries with smooth, rounded transitions that improve gas flow characteristics while avoiding the limitations of traditional manufacturing techniques.
Data Source
AI summary
Semiconductor processing tool showerhead designs suitable for multi-gas delivery and for being made through additive manufacturing are provided. Such showerhead designs may feature either internal spiral passages or internal plenums with a plurality of pillars spanning between upper and lower surfaces thereof distributed throughout.