RF Impedance Match Calibration Across Plasma Chamber Fleets
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Solution Overview
Problem
In high volume manufacturing environments, matching multiple plasma chambers for uniform output is exceedingly difficult due to differences in sensor variation, aging effects, and other variables, making it challenging to detect processing excursions and maintain optimal performance.
Innovation Solution
A method for field-adjusting calibration factors of RF impedance matches across multiple plasma chambers, involving data collection, clustering, and reconciliation to minimize impedance tuning variability, using a controller with an RF match correction algorithm to unify settings and detect excursions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple plasma chambers are used in parallel to improve throughput, then productivity increases, but chamber matching difficulty increases
Solution Approach 1:
The patent applies parameter changes by collecting operational data from multiple chambers and using statistical analysis to identify and adjust calibration factors. The system modifies RF impedance match parameters based on collected data to reconcile variations between chambers, enabling better matching while maintaining high throughput operation of multiple chambers in parallel
2Manufacturing precision
If chamber matching is performed manually to achieve uniform output, then manufacturing precision improves, but time consumption increases
Solution Approach 1:
The system implements self-service by automatically collecting operational data from multiple chambers, performing statistical analysis, and adjusting calibration factors without manual intervention. The automated system reconciles chamber variations and maintains optimal matching, eliminating time-consuming manual adjustment processes while preserving output uniformity
Solution Approach 2:
The patent employs feedback mechanisms by continuously collecting operational data from chambers and using this information to adjust calibration factors. The system monitors chamber performance and automatically reconciles variations based on collected data, creating a closed-loop control system that maintains precision without manual intervention
3Manufacturing precision
If RF impedance matches are adjusted individually for each chamber, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The patent applies universality by implementing a single centralized control system that manages RF impedance matching for multiple chambers. The system collects data from all chambers and applies reconciliation algorithms uniformly, providing a multi-functional solution that handles impedance matching across the entire fleet rather than requiring separate control systems for each chamber
Data Source
AI summary
Embodiments disclosed herein include a method for field adjusting calibrating factors of a plurality of RF impedance matches for control of a plurality of plasma chambers. In an embodiment, the method comprises collecting and storing in a memory data from operation of the plurality of RF impedance matches, and finding a tune space for each of the plurality of RF impedance matches from the collected data. In an embodiment, the method further comprises finding adjustments to account for variability in each of the plurality of RF impedance matches, finding adjustments to variable tuning elements of the plurality of RF impedance matches to account for time varying and process related load impedances, and the method further comprises obtaining operating windows for the variable tuning elements in the plurality of RF impedance matches.