Semiconductor Buffer Chamber Purge Gas Flow Control
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Solution Overview
Problem
Current semiconductor fabrication processes face challenges in achieving uniform distribution of purge gases within buffer chambers, leading to inefficient gas permeation and potential variations in semiconductor device quality due to asymmetrical arrangements of purge and pump ports.
Innovation Solution
The implementation of asymmetrical and symmetrical arrangements of purge and pump ports, combined with flow enhancers that direct purge gases in radial directions, promotes uniform gas distribution within the buffer chamber, enhancing the permeation and evacuation of gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If asymmetrical arrangement of purge and pump ports is used, then gas flow direction is controlled, but uniform gas distribution is compromised
Solution Approach 1:
The patent applies asymmetry by positioning the purge port and pump port at different locations within the buffer chamber, specifically with the purge port offset from direct opposition to the pump port. This asymmetrical arrangement creates a controlled flow path that directs gas through the chamber more effectively, improving gas distribution uniformity while maintaining operational control.
2Device complexity
If purge port and pump port are positioned directly opposite each other, then structural simplicity is maintained, but gas permeation efficiency is reduced
Solution Approach 1:
The patent positions the purge port at an offset location rather than directly opposite the pump port, creating an asymmetrical configuration. This offset positioning extends the gas flow path through the buffer chamber, allowing better gas permeation and distribution efficiency while maintaining relatively simple structural implementation.
3Manufacturing precision
If flow enhancers are added to direct gas flow, then gas distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The patent introduces flow enhancers at specific strategic locations within the buffer chamber rather than throughout the entire chamber. These localized flow enhancement features are positioned to target specific flow patterns, improving gas distribution uniformity in critical areas while minimizing the overall increase in device complexity.
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
This approach ensures a more uniform distribution of purge gases, improving the consistency and quality of semiconductor device fabrication by controlling gas flow patterns and reducing variations within the buffer chamber.
Implementation Method 1
a first flow enhancer that, when arranged adjacent to the purge port, directs the purge gas flowing in an axial direction along a longitudinal axis of the purge port into the buffer chamber in a plurality of radial directions relative to the longitudinal axis
Implementation Method 2
A partial vacuum at a pump port formed in a floor defining the buffer chamber draws a portion of the purge gas from the buffer chamber
Data Source
AI summary
An apparatus for fabricating a semiconductor device has a housing defining a buffer chamber, a plurality of reactor ports formed in the housing for establishing interfaces with a plurality of process chambers that are to receive a wafer during a fabrication process to fabricate the semiconductor device, a wafer positioning robot positioned within the buffer chamber to transport the wafer between the plurality of process chambers through the plurality of reactor ports, a purge port formed in the housing for introducing a purge gas into the buffer chamber, a pump port formed in the housing for exhausting a portion of the purge gas from the buffer chamber, and a first flow enhancer that directs the purge gas flowing in an axial direction along a longitudinal axis of the purge port into the buffer chamber in a plurality of radial directions relative to the longitudinal axis.