EFEM Multi-Chamber Pressure Layout for Wafer Transfer Gas Containment
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Solution Overview
Problem
Existing equipment front end modules (EFEMs) in semiconductor manufacturing face challenges in maintaining cleanliness by preventing harmful gases from escaping and contaminating the environment, as gases supplied for cleanliness can lead to pressure imbalances causing leaks and contamination.
Innovation Solution
The EFEM incorporates a multi-chambered structure with controlled pressure zones to prevent gas exchange between the transfer chamber and the external environment, using a first chamber with lower pressure and a second chamber with higher pressure to block gas escape and entry, respectively, ensuring a sealed environment for wafer transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If gases are supplied into the transfer chamber to maintain cleanliness, then the cleanliness in the transfer chamber is improved, but the pressure inside the transfer chamber becomes higher than outside, causing gases to escape and contamination to occur
Solution Approach 1:
The EFEM is divided into multiple sealed chambers (transfer chamber, load port chamber, process equipment chamber) with independent pressure control. Each chamber can maintain different pressure levels to prevent gas escape while preserving cleanliness in the transfer chamber.
Solution Approach 2:
Pressure control systems act as intermediaries between the transfer chamber and external environment. By controlling pressure differentials across chamber boundaries, the system prevents direct gas flow while maintaining cleanliness, using pressure regulation as a mediating mechanism.
2Productivity
If the EFEM is manufactured in a large size to accommodate wafer transfer, then the productivity is improved, but the sealing difficulty increases, causing leaks in the transfer chamber
Solution Approach 1:
The large EFEM structure is segmented into multiple smaller sealed chambers. This segmentation reduces the sealing surface area of each individual chamber, making sealing more reliable while maintaining the overall large size needed for wafer transfer operations.
Solution Approach 2:
Pressure control mechanisms serve as intermediaries that compensate for potential sealing imperfections. By maintaining pressure differentials across chamber boundaries, the system detects and prevents gas leaks without requiring perfect sealing of large surfaces.
3Object-affected harmful factors
If gases are supplied into the transfer chamber, then the cleanliness is maintained, but the pressure imbalance causes harmful gases to escape and workers to be exposed
Solution Approach 1:
The system segments the EFEM into pressure-controlled chambers, isolating harmful gases within the transfer chamber. This segmentation prevents gas escape to the external environment where workers are present, while maintaining cleanliness through controlled pressure differentials.
Solution Approach 2:
Pressure control systems act as intermediaries that prevent harmful gas escape. By regulating pressure across chamber boundaries, the system maintains cleanliness in the transfer chamber while preventing harmful gases from reaching external areas where workers are located.
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 configuration effectively prevents harmful gases from escaping while maintaining a clean internal environment, enhancing safety and reducing contamination risks by utilizing pressure differences to manage gas flow within the EFEM.
Implementation Method 1
using a first chamber with lower pressure and a second chamber with higher pressure to block gas escape and entry, respectively, ensuring a sealed environment for wafer transfer
Data Source
AI summary
Proposed is an EFEM configured to perform wafer transfer between a wafer storage device and process equipment. More particularly, proposed is an EFEM that prevents harmful gases inside a transfer chamber in which wafer transfer is performed from escaping out of the EFEM.