FOUP Deterioration Prediction via Sensor Data
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Solution Overview
Problem
Current methods for managing substrate storage containers in semiconductor manufacturing, such as FOUPs, are inefficient due to the need for frequent shape measurement or premature replacement, leading to increased costs and potential gas leakage, which can oxidize wafer surfaces.
Innovation Solution
A substrate storage container management system that uses a load port with an ID reader, sensors, and a database to detect and predict the deterioration of substrate storage containers, allowing for timely replacement and reducing the need for sensors on each container, thereby maintaining a clean environment and reducing maintenance burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If shape measurement is performed for each FOUP to determine deterioration degree, then the accuracy of deterioration assessment is improved, but the time and cost required for measurement increases significantly
Solution Approach 1:
The system segments the monitoring function by placing simple sensors on individual FOUPs to detect local conditions (tilt, temperature, humidity), while centralized management handles data aggregation and analysis. This segmentation allows individual FOUP monitoring without requiring time-consuming comprehensive shape measurements of each container.
Solution Approach 2:
The patent replaces mechanical shape measurement systems with sensor-based detection systems. Instead of physically measuring FOUP dimensions, the system uses tilt sensors, temperature sensors, and humidity sensors to indirectly assess FOUP condition and deterioration, significantly reducing measurement time while maintaining assessment accuracy.
2Reliability
If FOUPs are replaced uniformly after a predetermined number of uses or time period, then the risk of gas leakage is reduced, but the cost increases due to replacing non-deteriorated FOUPs
Solution Approach 1:
The system implements feedback monitoring through sensors that continuously track FOUP conditions (tilt angle, temperature, humidity). This feedback enables real-time assessment of actual FOUP deterioration status, allowing replacement decisions to be based on actual condition rather than arbitrary use counts or time periods, thus reducing unnecessary replacements while maintaining gas sealing reliability.
Solution Approach 2:
The patent changes the basis for replacement decisions from fixed parameters (number of uses, time period) to dynamic parameters (actual sensor readings indicating deterioration). By monitoring tilt angles, temperature variations, and humidity levels, the system identifies when FOUPs actually deteriorate, enabling cost-effective replacement only when necessary for maintaining gas sealing.
3Measurement precision
If sensors are installed on each FOUP to monitor deterioration, then the precision of deterioration detection is improved, but the device complexity and maintenance burden increase
Solution Approach 1:
The patent applies universality by using multi-functional sensors that simultaneously monitor multiple parameters (tilt, temperature, humidity) with a single device. The standardized sensor modules can be installed on any FOUP type, and the centralized management system handles data from multiple FOUPs uniformly, reducing overall system complexity despite increased monitoring precision.
Solution Approach 2:
The system merges individual FOUP sensor data into a centralized management system that aggregates and analyzes information from multiple sources. This merging approach simplifies the overall architecture by consolidating data processing and decision-making functions, reducing the complexity that would otherwise arise from distributed independent monitoring systems on each FOUP.
4Loss of substance
If FOUPs are used beyond their deterioration threshold to reduce replacement costs, then the replacement cost decreases, but the risk of gas leakage and wafer oxidation increases
Solution Approach 1:
The system performs preliminary detection of deterioration through sensor monitoring before actual gas leakage occurs. By detecting changes in tilt angle, temperature, and humidity that indicate impending deterioration, the system enables proactive replacement decisions that prevent gas leakage and wafer oxidation while avoiding premature replacement of still-functional FOUPs, thus optimizing both cost and safety.
Data Source
AI summary
A substrate storage container management system includes a load port, configured to transfer a substrate into and out of one or more substrate storage containers, including an ID reader configured to read one or more entity IDs for the substrate storage containers, and one or more sensors configured to directly or indirectly detect one or more states of the substrate storage containers, an associator configured to associate the entity IDs read by the ID reader with one or more sensor values detected by the sensors; a database in which data associated by the associator is accumulated, and a data processor configured to analyze the data in the database and to output a state of a respective substrate storage container for each of the entity IDs.