Substrate Processing Guardbands for Adaptive Fault Detection
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Solution Overview
Problem
Conventional substrate processing systems face issues with accurately identifying substrates that meet specific property values, leading to false positives and missed positives, resulting in waste, decreased yield, and increased downtime due to narrow or broad guardband limits.
Innovation Solution
The method involves generating a guardband based on trace data from substrates with known property values, allowing for dynamic variance and position-dependent adjustments, enabling more precise fault detection and corrective actions by comparing new data points to these guardbands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If narrow guardband limits are used, then manufacturing precision is improved, but false positives increase leading to decreased productivity
Solution Approach 1:
The patent implements dynamic guardband adjustment by continuously updating guardband parameters based on real-time process data and historical performance. The system transitions from static, fixed guardbands to adaptive, time-varying guardbands that automatically widen or narrow based on current process stability, thereby maintaining high precision during stable operation while preventing false alarms during transient states that would otherwise reduce productivity
Solution Approach 2:
The system dynamically changes guardband parameters (such as width, position, and shape) based on process conditions, historical data, and statistical analysis. By adjusting these parameters in response to changing process states, the system maintains optimal detection precision without triggering unnecessary false positives that would halt production and reduce throughput
2Productivity
If broad guardband limits are used, then productivity is improved by reducing false positives, but manufacturing precision deteriorates leading to missed positives
Solution Approach 1:
The system employs dynamic guardband adjustment that adapts the guardband width and position based on real-time process stability assessment. During stable process conditions, the guardband narrows to maintain high detection precision and prevent missed positives. During transient or unstable conditions, the guardband automatically widens to reduce false positives, thus maintaining both productivity and precision at different operational phases
Solution Approach 2:
The patent applies different guardband characteristics to different regions of the parameter space or different process stages. By tailoring the guardband properties locally to match the specific requirements of each operating condition, the system achieves high precision where needed while maintaining overall productivity through reduced false alarms in less critical regions
3Device complexity
If static guardband limits are used, then device complexity is reduced, but adaptability deteriorates leading to increased false positives and missed positives
Solution Approach 1:
The system implements self-adjusting guardbands that automatically update their parameters based on incoming process data without requiring external intervention. The guardband system monitors process stability, detects changes in process behavior, and autonomously adjusts its width and position accordingly, thereby achieving high adaptability through a relatively simple automated feedback mechanism rather than complex manual tuning or overly complicated control systems
Data Source
AI summary
A method includes identifying trace data including a plurality of data points, the trace data being associated with production, via a substrate processing system, of substrates having property values that meet threshold values. The method further includes generating, based on the trace data and a plurality of allowable types of variance, a guardband including an upper limit and a lower limit for fault detection. The method further includes causing, based on the guardband, performance of a corrective action associated with the substrate processing system.