Vacuum Chamber Cleanliness Monitor Using Molecular Aggregation
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Solution Overview
Problem
Molecular contamination in semiconductor manufacturing vacuum chambers leads to wafer malfunctions due to organic molecules absorbed on the wafer surfaces, with varying cleanliness levels influenced by maintenance activities and wafer outgassing, necessitating a method to monitor and maintain vacuum chamber cleanliness.
Innovation Solution
A cleanliness monitor system comprising a mass spectrometer, a molecule aggregation and release unit, and an analyzer that aggregates and releases organic molecules within the vacuum chamber, allowing the mass spectrometer to detect their presence and generate signals indicative of cleanliness, with a flow control unit directing molecules to the spectrometer and a dummy unit for comparative analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If molecules are released continuously towards the mass spectrometer, then detection capability is improved, but molecule concentration at detector is insufficient
Solution Approach 1:
The molecule aggregator performs preliminary concentration by accumulating molecules over time before release. This pre-concentration ensures that when molecules are released toward the mass spectrometer, they arrive at sufficient concentration for reliable detection.
Solution Approach 2:
The system maintains continuous monitoring capability through periodic aggregation and release cycles. The aggregation phase continuously accumulates molecules while the release phase continuously directs concentrated molecules to the detector, ensuring uninterrupted detection capability.
2Measurement precision
If a dummy molecule aggregation and release unit is added for comparative analysis, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The dummy molecule aggregation and release unit is a simplified copy of the main unit, lacking only the wafer exposure capability. It replicates the aggregation and release mechanism to provide a control reference for comparative analysis, enabling accuracy improvement through a relatively simple additional component.
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
Effectively monitors and determines the cleanliness of vacuum chambers by comparing detection signals before and after the release period, enhancing sensitivity and accuracy in detecting organic molecules, thereby preventing wafer malfunctions and maintaining consistent cleanliness levels.
Implementation Method 1
The molecule releaser may be electrically coupled to a molecule aggregator of the molecule aggregator and releaser; and wherein the molecule releaser may be configured to drive an electrical current through the molecule aggregator thereby heating the molecule aggregator.
Implementation Method 2
a mass spectrometer configured to monitor an environment within the vacuum chamber and to generate detection signals that may be indicative of a content of the environment
Implementation Method 3
The cleanliness monitor may include a flow control unit for affecting a propagation of the aggregated molecules during the release period. The flow control unit may include a pump for directing the aggregated molecules towards the mass spectrometer.
Data Source
AI summary
A cleanliness monitor for monitoring a cleanliness of a vacuum chamber. The cleanliness monitor may include a mass spectrometer, a molecule aggregation and release unit and an analyzer. The molecule aggregation and release unit is configured to (a) aggregate, during an aggregation period, organic molecules that are present in the vacuum chamber and (b) induce, during a release period, a release of a subset of the organic molecules towards the mass spectrometer. The mass spectrometer is configured to monitor an environment within the vacuum chamber and to generate detection signals indicative of a content of the environment; wherein a first subset of the detection signals is indicative of a presence of the subset of the organic molecules. The analyzer is configured to determine the cleanliness of the vacuum chamber based on the detection signals.