Semiconductor Effluent Abatement With Standby Backup Switching
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Solution Overview
Problem
Existing abatement apparatus for semiconductor manufacturing effluent gas streams face inefficiencies, particularly when a malfunction occurs, leading to potential interruptions in the manufacturing process due to the need to interrupt processing to address the malfunction.
Innovation Solution
A dual abatement system is implemented, with a primary abatement device operating actively and a secondary device in standby mode. Upon detection of an alarm condition, the secondary device is activated to seamlessly take over, ensuring continuous processing without interruption, and includes control logic to manage the switching process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single abatement device is used to treat effluent gas streams, then device complexity is reduced, but reliability deteriorates because malfunction causes processing interruptions
Solution Approach 1:
The abatement system is segmented into multiple independent abatement devices (first abatement device and second abatement device), each capable of treating the effluent gas stream separately. This segmentation allows one device to operate while another is in standby, improving reliability without requiring a fully complex integrated system.
Solution Approach 2:
The second abatement device is prepared in advance in a standby mode with all necessary components in place but not actively treating gas. This preliminary preparation ensures that when the first device malfunctions, the backup device can immediately take over without interruption to the manufacturing process.
2Reliability
If a backup abatement device is maintained in active mode, then reliability is improved, but energy consumption increases significantly
Solution Approach 1:
The system dynamically switches between active and standby modes based on operational needs. The second abatement device remains in a low-energy standby mode during normal operation and only transitions to active mode when the first device malfunctions, optimizing energy consumption while maintaining reliability.
Solution Approach 2:
Different parts of the system have different operational states: the first abatement device operates in active mode with full treatment capability, while the second device maintains standby mode with minimal energy consumption. This local differentiation of operational quality optimizes overall system efficiency.
3Loss of time
If abatement processing is interrupted to address device malfunction, then ease of operation is reduced, but loss of time is minimized
Solution Approach 1:
The control system acts as an intermediary that automatically detects malfunctions and switches between abatement devices without requiring manual intervention. This automated mediation minimizes the time loss from interruptions while maintaining ease of operation through centralized control.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor the operational status of the first abatement device and automatically trigger a switch to the second device when a malfunction is detected. This feedback loop ensures minimal interruption time while maintaining automated operation.
Data Source
AI summary
An abatement apparatus and method are disclosed. The abatement apparatus is for treating an effluent stream from a semiconductor processing tool and comprises: a first abatement device configured to receive the effluent stream and operable to run in an active mode to treat the effluent stream; a second abatement device operable to run in an idle mode; and control logic operable, on receipt of an indication of an alarm condition associated with the first abatement device, to run the second abatement device in the active mode. In this way, a first or primary abatement device is provided which treats the effluent stream and a second or back-up abatement device is provided, should the first abatement device malfunction. However, by only causing the second abatement device to operate in the active mode when the first abatement device malfunctions, significant energy savings can be made.