Cross-Flow Gas Delivery Layout for Low-Particle Showerheads
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Solution Overview
Problem
Current microwave showerhead designs for semiconductor manufacturing processing chambers suffer from particle generation due to O-rings in the flow path, leading to device failures and reduced yield.
Innovation Solution
A gas distribution apparatus with a backing plate featuring inwardly angled inlet channels and a faceplate with apertures, positioned to eliminate flow through the faceplate and O-rings, allowing for crossflow gas delivery without particle-generating components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If O-rings are used to isolate the flow path and maintain vacuum in microwave showerhead designs, then vacuum isolation is achieved, but particle generation occurs leading to device failures
Solution Approach 1:
The patent removes O-rings from the gas flow path entirely by implementing a metal-to-metal seal between the facility and faceplate. This extraction of the problematic component eliminates the particle generation source while maintaining vacuum isolation through alternative sealing mechanisms that do not involve elastomeric materials in the plasma environment.
Solution Approach 2:
The patent introduces a flange structure with metal-to-metal sealing surfaces as an intermediary between the facility and faceplate. This intermediary mechanism provides vacuum isolation without requiring O-rings in the flow path, thereby preventing particle generation while maintaining the necessary vacuum seal.
2Ease of operation
If gas flows through the faceplate with apertures, then gas distribution is achieved, but O-rings in the flow path generate particles
Solution Approach 1:
The patent extracts O-rings from the gas flow path by implementing a flange design where the facility seals directly to the faceplate without elastomeric components in the plasma environment. The gas flow path is rerouted through the facility and into the processing region without passing through O-ring sealed interfaces, eliminating particle contamination while maintaining effective gas distribution.
3Power
If conventional showerhead design with resonators and O-rings is used, then microwave plasma generation is achieved, but particle generation decreases yield
Solution Approach 1:
The patent removes O-rings from the microwave showerhead assembly by implementing a flange-to-flange metal seal between the facility and faceplate. This extraction eliminates the particle generation source while preserving microwave plasma generation capabilities through the resonator structure, thereby improving manufacturing yield without sacrificing plasma process effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively separates plasma and flow paths, reducing particle generation and enhancing wafer sweep area, resulting in improved semiconductor manufacturing process efficiency and yield.
Implementation Method 1
cross-flow gas delivery systems for semiconductor manufacturing processing chambers
Implementation Method 2
Many deposition and etching processes in semiconductor manufacturing use a microwave plasma source to generate a plasma within a processing region of a processing chamber
Data Source
AI summary
Gas distribution apparatus comprising a backing plate and faceplate, and methods of use are described. The backing plate has a peripheral channel with a plurality of inwardly angled inlet channels extending from the peripheral channel to the front surface of the backing plate. The plurality of inwardly angled inlet channels are located in an inlet semicircle of the backing plate and spaced to form an inlet zone comprising a minor arc of a semicircle less than 160°. An outlet opening in an outlet semicircle in the range of 30° to 90° is centered opposite the center of the minor arc of the inlet semicircle.