Gas Distribution Port Insert for Back Diffusion and Abrasion Control
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Solution Overview
Problem
Existing semiconductor processing tools face issues with process gas interaction and back diffusion into gas distribution ports, leading to degradation of showerheads, increased downtime, and reduced product yield due to particulate generation and material shedding.
Innovation Solution
The implementation of gas distribution port inserts with specific designs to increase clearance and control gas flow, reducing abrasion and back diffusion, and incorporating features to direct gas flow away from the ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas distribution ports are used to flow process gases, then deposition or etching operations can be performed on the wafer, but process gases may back diffuse into the gas distribution ports causing degradation and particulate generation
Solution Approach 1:
A gas distribution port insert is introduced as an intermediary component between the gas distribution port and the showerhead. This insert includes a gas inlet port, a gas outlet port, and a bypass passage that directs process gas away from the gas distribution port opening. The bypass passage acts as a mediator to prevent process gas from back diffusing into the gas distribution port, thereby eliminating degradation while maintaining processing efficiency
2Manufacturing precision
If gas distribution ports are positioned close to the wafer surface, then gas flow control is improved, but abrasion and particulate generation increase due to thermal movement
Solution Approach 1:
The gas distribution port insert serves as a mediator structure that decouples the gas distribution function from the showerhead. By providing a separate bypass passage within the insert, the system maintains precise gas flow control at the wafer surface while preventing thermal abrasion between the showerhead and gas distribution ports, thereby eliminating particulate generation
3Productivity
If showerhead operates continuously, then productivity is maintained, but process gas interaction leads to increased downtime for maintenance
Solution Approach 1:
The gas distribution port insert acts as a protective intermediary that prevents process gas from degrading the showerhead. This allows the showerhead to operate continuously at full productivity without accumulating degradation, thereby eliminating the need for periodic maintenance shutdowns and associated time losses
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
Reduces particulate generation, minimizes showerhead degradation, and enhances processing efficiency by preventing gas interaction and back diffusion, thereby improving equipment longevity and yield.
Implementation Method 1
thermally induced movement of the insert relative to the port
Implementation Method 2
causing, at least in part, directional gas flow configured to propel gas radially outwards from an axis
Implementation Method 3
back diffusion into gas distribution ports of the showerhead
Data Source
AI summary
A gas distribution port insert, and equipment for use therewith, capable of suppressing or at least reducing process gas interaction with and/or back diffusion into a gas distribution body including the gas distribution port insert in association with a semiconductor processing tool.