Process Chamber Thermal Imaging for Real-Time Plasma Control
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Solution Overview
Problem
Monitoring, controlling, and optimizing plasma processes in semiconductor fabrication are challenging due to limited information from existing in situ monitoring techniques, requiring labor-intensive empirical adjustments of process parameters.
Innovation Solution
A system with optical access apertures, camera sensors, and analysis logic to determine thermal characteristics of components within the process chamber, enabling real-time monitoring and adjustment of plasma processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional in situ monitoring techniques are used, then process monitoring is possible, but the information provided is limited and only available at specific sensor locations
Solution Approach 1:
The patent transitions from point-based VI sensor measurements to area-based thermal imaging measurements. The infrared camera captures thermal characteristics across the entire process chamber simultaneously, adding spatial dimensionality to the monitoring process and eliminating information loss at unsampled locations.
Solution Approach 2:
The thermal imaging system serves multiple functions: it monitors temperature distribution, detects thermal anomalies, characterizes plasma processes, and provides comprehensive spatial information all through a single imaging approach, replacing multiple point sensors and expanding measurement capabilities.
2Manufacturing precision
If empirical testing of process parameters is performed, then process optimization can be achieved, but the process is labor-intensive and time-consuming
Solution Approach 1:
The system implements real-time thermal feedback by continuously monitoring temperature distributions and providing immediate data for process adjustment. This eliminates the need for time-consuming empirical trial-and-error cycles, as process parameters can be optimized based on direct thermal observations and feedback loops.
Solution Approach 2:
The patent replaces manual empirical testing with automated thermal imaging and computer-based analysis. The imaging system and associated software automatically characterize processes and guide optimization, substituting labor-intensive mechanical adjustment procedures with automated optical and computational systems.
3Device complexity
If point-based sensors are used for monitoring, then simple measurement is possible, but comprehensive process characterization is not achieved
Solution Approach 1:
The system transitions from one-dimensional point measurements to two-dimensional area measurements using thermal imaging. This dimensional expansion captures spatial relationships and temperature gradients across the process chamber, providing comprehensive spatial process information that point sensors cannot obtain.
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 solution provides accurate, real-time monitoring and control of thermal characteristics, improving the efficiency and precision of plasma processes in semiconductor fabrication.
Implementation Method 1
one or more camera sensors optically coupled to the one or more optical access apertures... analysis logic configured to process signals from the one or more camera sensors to determine one or more thermal characteristics
Data Source
AI summary
Multi-pixel sensors such as camera sensors may be configured to capture two-dimensional and/or three-dimensional images of the interior of a process chamber or other fabrication tool. The sensors may be configured to capture pixelated electromagnetic radiation intensity information from within the interior of such process chamber before, during, and/or after processing of a substrate in the chamber. Such sensors may also be utilized for control, predictive, and/or diagnostic applications.