Dual Plenum Gas Injection Apparatus for Flashback Prevention
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Solution Overview
Problem
Existing gas injection systems for semiconductor processing, particularly in rapid thermal processing, face issues with suboptimal gas mixing leading to non-uniformity and potential damage from flashback due to inadequate gas velocity and premixing problems.
Innovation Solution
A gas injection apparatus with a dual plenum design and vortex generators to independently control and mix gases, ensuring stable combustion and uniform gas distribution by maintaining gas separation until mixing inside the processing chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If process gases are supplied from separate gas inlets, then flashback risk is reduced, but gas mixing uniformity deteriorates
Solution Approach 1:
The gas supply system is divided into separate top and bottom plenums with independent gas inlets, allowing gases to be introduced separately while still achieving uniform mixing through the plenum structure and substrate rotation
Solution Approach 2:
Gas injection is extended from a single plane to three-dimensional space by introducing gases from both top and bottom plenums, creating uniform mixing through spatial distribution rather than relying solely on substrate rotation
2Manufacturing precision
If process gases are premixed before delivery, then gas mixing uniformity is improved, but flashback risk increases
Solution Approach 1:
Gases are pre-positioned in separate plenums with controlled flow paths, allowing preparation and control before actual mixing occurs at the substrate, preventing premature combustion
Solution Approach 2:
The plenum structure acts as an intermediary chamber that facilitates controlled gas mixing through the substrate without direct premixing in delivery lines, eliminating flashback risk while achieving uniformity
3Manufacturing precision
If substrate rotation speed is increased, then gas mixing uniformity is improved, but process stability deteriorates
Solution Approach 1:
The gas supply is segmented into top and bottom plenums with independent control, eliminating reliance on substrate rotation for mixing and allowing stable processing without rotation-induced variability
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 enables improved gas mixing and delivery, allowing a broader range of gas concentrations with reduced flashback, enhancing process uniformity and preventing damage to the gas supply system.
Implementation Method 1
the vortex generator comprises a constricted volume area in an upper portion of the top plenum
Data Source
AI summary
Methods and apparatus for mixing and delivery of process gases are provided herein. In some embodiments, a gas injection apparatus includes an elongate top plenum comprising a first gas inlet; an elongate bottom plenum disposed beneath and supporting the top plenum, the bottom plenum comprising a second gas inlet; a plurality of first conduits disposed through the bottom plenum and having first ends fluidly coupled to the top plenum and second ends disposed beneath the bottom plenum; and a plurality of second conduits having first ends fluidly coupled to the bottom plenum and second ends disposed beneath the bottom plenum; wherein a lower end of the bottom plenum is adapted to fluidly couple the gas injection apparatus to a mixing chamber such that the second ends of the plurality of first conduits and the second ends of the plurality of second conduits are in fluid communication with the mixing chamber.