Process Chamber Optical Emission Spectroscopy for Real-Time Gas Detection
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Solution Overview
Problem
Detection of gas precursors and reaction byproducts in semiconductor process chambers is difficult, making it challenging to adjust process conditions effectively, and current inspection methods require the chamber to be taken out of production for manual testing.
Innovation Solution
Utilizing optical emission spectroscopy to measure precursor gases, reaction products, and residues within a process chamber by emitting photons to an optical emission spectrometer, identifying emission peaks, and adjusting process variables in real time based on comparisons with stored values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual inspection methods are used to detect gas precursors and reaction byproducts, then detection capability is achieved, but production time is lost and chamber recovery time increases
Solution Approach 1:
The patent replaces manual mechanical inspection methods with optical emission spectroscopy, a non-contact optical measurement system. The OES system uses photons to detect gas precursors and reaction byproducts in real-time during chamber operation, eliminating the need to open and manually inspect the chamber while maintaining accurate detection capability.
Solution Approach 2:
The optical emission spectroscopy system enables continuous monitoring of gas concentrations throughout the deposition process without interrupting production. The chamber remains operational and productive while the OES system continuously detects emission peaks from gas precursors and reaction byproducts, eliminating downtime associated with manual inspection and chamber recovery.
2Productivity
If optical emission spectroscopy is implemented for real-time detection, then production continuity is maintained, but device complexity increases
Solution Approach 1:
The optical emission spectroscopy system serves multiple functions: it detects gas precursor concentrations, monitors reaction byproduct formation, and provides real-time feedback for process control. This multi-functional capability is achieved through a single integrated optical measurement system rather than requiring separate detection systems for each function, managing complexity while maintaining productivity.
3Extent of automation
If real-time optical emission spectroscopy monitoring is used, then process condition adjustment is enabled, but measurement precision requirements increase
Solution Approach 1:
The optical emission spectroscopy system provides real-time feedback on gas precursor and reaction byproduct concentrations to the deposition process control system. By continuously monitoring emission peaks and comparing them against target values, the system enables automated real-time adjustment of deposition parameters to maintain desired film properties, with the feedback loop managing the precision requirements through continuous optimization.
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
Enables efficient and accurate monitoring of gas concentrations and residues, allowing real-time adjustments of process conditions and automatic triggering of chamber cleans, maintaining the chamber in production without manual inspection.
Implementation Method 1
emitting photons from the process chamber to an optical emission spectrometer; identifying emission peaks with the optical emission spectrometer
Data Source
AI summary
Methods for detection using optical emission spectroscopy in which an optical signal is delivered from the process chamber to an optical emission spectrometer (OES). The OES identifies emission peaks of photons, which corresponds to the optical intensity of radiation from the photons, to determine the concentrations of each of the precursor gases and reaction products. The OES sends input signals of the data results to a controller. The controller can adjust process variables within the process chamber in real time during deposition based on the comparison. In other embodiments, the controller can automatically trigger a process chamber clean based on a comparison of input signals of process chamber residues received before the deposition process and input signals of process chamber residues received after the deposition process.