Magnetic Field Detection for Micro-Arcing in Plasma Chambers
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Solution Overview
Problem
Micro-arcing in plasma chambers during semiconductor production leads to dielectric breakdown, contaminating wafers and resulting in defective products, as existing technologies cannot detect and address this issue in real-time effectively.
Innovation Solution
A system that uses a radio frequency (RF) generator coupled to a plasma chamber via a transmission line, with a magnetic-field detector measuring the magnetic field generated by the RF current to detect micro-arcing in real-time, allowing for immediate remediation and reduction of defective wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a plasma chamber is operated continuously for semiconductor production, then productivity increases, but micro-arcing occurs causing dielectric breakdown and wafer contamination
Solution Approach 1:
The patent implements a feedback mechanism by monitoring magnetic field changes near the transmission line using a magnetic field sensor. When micro-arcing is detected through characteristic magnetic field signatures, the system can trigger alerts or shutdown sequences to prevent wafer contamination, thus maintaining reliability during continuous operation
Solution Approach 2:
The patent introduces a magnetic field sensor as an intermediary element that indirectly detects micro-arcing events without interfering with the plasma process. The sensor measures magnetic field disturbances caused by arcing currents, providing a non-intrusive detection method that enables continuous monitoring during semiconductor production
2Measurement precision
If existing detection methods are used, then device complexity is minimized, but detection precision for micro-arcing is insufficient
Solution Approach 1:
The patent replaces complex mechanical or optical detection systems with a magnetic field-based detection approach. By using a magnetic field sensor to detect the electromagnetic signature of micro-arcing, the system achieves high detection precision with relatively simple instrumentation, avoiding the complexity of direct visual or physical inspection methods
3Loss of substance
If micro-arcing is not detected in real-time, then processing continues without interruption, but contaminated wafers are produced increasing loss of substance
Solution Approach 1:
The patent enables preliminary detection of micro-arcing events before they cause significant wafer contamination. By continuously monitoring magnetic field signatures and detecting arcing events in real-time, the system can alert operators or initiate shutdown sequences before contaminated wafers are produced, reducing material loss while maintaining efficient processing
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 real-time detection and prevention of micro-arcing, reducing the number of scrapped wafers and identifying defects early, thereby saving processing resources and minimizing contamination.
Implementation Method 1
A magnetic-field detector is disposed proximate the transmission line and is configured to measure a magnetic field generated by the RF signal
Data Source
AI summary
Some embodiments relate to a system. The system includes a radio frequency (RF) generator configured to output a RF signal. A transmission line is coupled to the RF generator. A plasma chamber is coupled to RF generator via the transmission line, wherein the plasma chamber is configured to generate a plasma based on the RF signal. A micro-arc detecting element is configured to determine whether a micro-arc has occurred in the plasma chamber based on the RF signal.