Optical Endpoint Detection for Process Chamber Cleaning
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Solution Overview
Problem
Current methods for determining the endpoint of process chamber cleaning in substrate processing are subjective or resource-intensive, leading to potential surface degradation or residual deposits that cause process drift and defects.
Innovation Solution
A system comprising a light detector and controller that monitors light reflections off internal process chamber surfaces to accurately determine the endpoint of the cleaning process, minimizing wear on chamber components and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cleaning process is performed for a longer period, then the chamber surfaces are cleaner, but the chamber components experience more degradation
Solution Approach 1:
The system uses a light source and light detector to continuously monitor the cleanliness of chamber surfaces during the cleaning process. When the detected light intensity indicates that the surface is sufficiently clean, the system automatically terminates the cleaning process, providing real-time feedback control to prevent over-cleaning and component degradation.
Solution Approach 2:
The patent replaces subjective visual observation methods with an optical detection system consisting of a light source and light detector. This substitution provides objective, quantitative measurement of surface cleanliness through light intensity detection, enabling precise endpoint determination without human subjectivity.
2Duration of action of stationary object
If the cleaning process is performed for a shorter period, then the chamber components are preserved, but deposits remain on surfaces causing process drift and defects
Solution Approach 1:
The light detection system provides continuous monitoring during the cleaning process, detecting when sufficient cleanliness is achieved. This feedback mechanism ensures the cleaning process stops at the optimal point, preventing both under-cleaning (which would cause defects) and over-cleaning (which would degrade components).
Solution Approach 2:
The system replaces tedious manual inspection and subjective judgment with automated optical detection. The light detector provides objective, real-time data on surface cleanliness, enabling precise control of the cleaning endpoint without resource waste or subjective error.
3Device complexity
If visual observations are used to determine cleaning endpoint, then the process is simple, but the results are subjective and prone to errors
Solution Approach 1:
The patent replaces subjective visual observation with an automated optical detection system comprising a light source and light detector. This substitution eliminates human subjectivity and error while providing objective, quantitative measurement of surface cleanliness through light intensity detection.
Solution Approach 2:
The system enables the cleaning process to self-terminate based on automated detection. The light detector continuously monitors surface cleanliness and automatically signals when the cleaning endpoint is reached, eliminating the need for continuous human observation and decision-making.
4Device complexity
If manual inspection methods are used, then the system is simple, but it causes unnecessary usage of substrates and resources
Solution Approach 1:
The optical detection system enables the cleaning process to autonomously determine its own endpoint without requiring external inspection. The light source and detector work together to automatically monitor and signal when cleaning is complete, eliminating the need for substrate-based inspection methods and associated resource consumption.
Solution Approach 2:
The system replaces resource-intensive manual inspection processes with a simple optical detection mechanism. This substitution eliminates the need to process substrates for inspection purposes, reducing waste of substrates and other resources while maintaining monitoring functionality.
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 provides an objective and efficient method for determining the endpoint of chamber cleaning, reducing process drift and defects while extending the lifetime of chamber components.
Implementation Method 1
a light detector positioned to detect light reflected off of a first internal surface of the process chamber
Data Source
AI summary
Methods and apparatus for determining an endpoint of a process chamber cleaning process are provided. In some embodiments, a method of monitoring a process being performed in a process chamber includes: performing a cleaning process in a process chamber to remove material deposited on one or more internal surfaces of the process chamber resultant from processes performed within the process chamber; shining a light on a first internal surface being cleaned; detecting the light reflected off of the first internal surface; and terminating the cleaning process based upon the detected light.