Plasma Chamber Matching via Non-Invasive Optical Diagnostics
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Solution Overview
Problem
Current chamber matching methods in plasma processing are inefficient, requiring destructive metrology and leading to lost productivity and revenue due to the need for substrate testing, and often result in false fault detections due to indirect links between plasma parameters and device characteristics.
Innovation Solution
A method and system that utilize non-invasive diagnostics to match plasma conditions across multiple chambers by measuring and adjusting ion and neutral flux variables, using proxies such as temperature change and optical emission spectrometry, to determine etch rate and critical dimension, thereby reducing the need for destructive testing and improving fault detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If destructive metrology techniques are used to verify etch rate and critical dimension, then measurement precision is improved, but productivity deteriorates due to lost substrates and time
Solution Approach 1:
The patent introduces an intermediary diagnostic system that uses optical emission spectrometry and other non-destructive sensors to measure plasma parameters (ion flux, neutral flux, radical density) as mediators between process conditions and final device characteristics. These intermediaries provide real-time feedback without requiring destructive substrate testing, thus maintaining measurement precision while preserving productivity.
Solution Approach 2:
The patent replaces the mechanical/physical destructive testing approach with optical and electromagnetic diagnostic methods. Instead of physically examining processed substrates through destructive metrology, the system uses optical emission spectrometry, interferometry, and other non-contact diagnostic techniques to monitor plasma conditions during processing, eliminating substrate loss while maintaining measurement capability.
2Ease of operation
If statistical fault detection systems with user-defined boundaries are used, then ease of operation is improved, but reliability deteriorates due to false fault detections
Solution Approach 1:
The patent implements a feedback-based fault detection system that continuously monitors plasma parameters (ion flux, neutral flux, radical density) and compares them against dynamically updated reference profiles from golden chambers. The system provides real-time feedback on chamber matching status and process health, enabling operators to distinguish between normal variations and actual faults without arbitrary boundaries, thus improving both ease of operation and reliability.
Solution Approach 2:
The patent performs preliminary characterization of plasma parameters during golden chamber operations to establish reference profiles before production begins. This preliminary action creates a baseline for comparison during actual processing, allowing the fault detection system to identify deviations from optimal performance without requiring arbitrary thresholds, thereby reducing false detections while maintaining operational simplicity.
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 approach minimizes device performance mismatch by directly linking plasma parameters to critical dimension and etch rate, reducing unnecessary downtime and revenue loss, and providing accurate chamber matching without destructive metrology, thus enhancing productivity and reliability.
Implementation Method 1
preferred process chamber characteristics stored in the memory include one or more variables related to a preferred ion flux of a plasma generated in a golden process chamber
Implementation Method 2
using proxies such as temperature change and optical emission spectrometry
Data Source
AI summary
A method and a system for monitoring a plasma chamber are provided. The method includes receiving process chamber characteristics from the plasma chamber; determining whether one or more variables associated with the process chamber characteristics are within predetermined specification. The method further includes updating a status of the plasma chamber to failure when the chamber characteristics are not within the predetermined specification. The method generates a warning notification when the chamber characteristics are within predetermined specification and when an operation status of the plasma chamber received from a fault detection system indicates a failure.