Load Port Plenum Isolation for Corrosive Gas Protection
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Solution Overview
Problem
In semiconductor fabrication environments, load ports are challenged by corrosive gases such as hydrogen bromide and hydrochloric acid, which pose corrosion risks to exposed components, leading to increased costs and complexity due to unpredictable gas flow and varying geometries of front opening unified pods (FOUPS), making effective mitigation difficult and expensive.
Innovation Solution
The implementation of a differential pressure plenum space within the load port module to contain and evacuate corrosive gases, preventing contact with load port components such as printed circuit boards, motors, and sensors, thereby reducing the need for costly coatings and simplifying the load port design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-corrosion coatings are applied to load port components, then corrosion protection is improved, but manufacturing cost and complexity increase
Solution Approach 1:
A plenum space is introduced as an intermediary protective environment between corrosive gases and load port components. This plenum contains inert or controlled atmosphere that mediates the interaction, preventing direct contact between corrosive gases and sensitive components, thereby eliminating the need for anti-corrosion coatings while maintaining protection
Solution Approach 2:
The corrosive gas environment is extracted or separated from the load port component environment by creating a distinct plenum space. This separation removes the harmful factor (corrosive gases) from direct contact with components, allowing the use of standard materials without specialized anti-corrosion treatments
2Reliability
If modifications are made to redirect corrosive gas, then corrosion protection is improved, but manufacturing cost and lead time increase
Solution Approach 1:
The plenum space is designed and configured in advance during the manufacturing process to inherently contain and redirect corrosive gases before they can reach sensitive components. This preliminary structural arrangement eliminates the need for post-manufacturing modifications or complex gas redirection systems, reducing manufacturing lead time while maintaining corrosion protection
3Reliability
If coatings are applied to all load port components, then corrosion protection is improved, but cost increases due to unpredictable gas flow patterns
Solution Approach 1:
Instead of uniformly coating all components, the plenum space creates a localized protective environment only where corrosive gases are present. This allows selective protection in the plenum region while leaving other areas with standard finishes, reducing the quantity of coating material required while maintaining adequate corrosion protection in critical zones
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 solution effectively mitigates corrosive gas exposure, reducing costs, complexity, and manufacturing lead time by creating a controlled environment that protects load port components from corrosive gases, ensuring reliable operation and efficient processing.
Implementation Method 1
a differential pressure plenum space within the load port module to contain and evacuate corrosive gases
Data Source
AI summary
A substrate loading device including a frame adapted to connect to a substrate processing apparatus, the frame having a transport opening through which substrates are transported to the processing apparatus, a cassette support connected to the frame for holding at least one substrate cassette container proximate the transport opening, the support configured so that a sealed internal atmosphere of the container is accessed from the support at predetermined access locations of the container, and the cassette support has a predetermined continuous steady state differential pressure plenum region, determined at least in part by boundaries of fluid flow generating differential pressure, so that the predetermined continuous steady state differential pressure plenum region defines a continuously steady state fluidic flow isolation barrier disposed on the support between the predetermined access locations of the container and another predetermined section of the support isolating the other predetermined section from the predetermined access locations.