Plasma Ignition Monitoring for Lower-Voltage Breakdown Control
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Solution Overview
Problem
Conventional plasma sources face issues with high-voltage ignition leading to unnecessary stress on electronics, increased arcing, and particulate defects, especially in unfavorable gas conditions, which can reduce the yield of high-performance chips in semiconductor processing.
Innovation Solution
A method and apparatus for monitoring the ignition process of a plasma source, adjusting the ignition voltage and frequency based on real-time conditions, and using a self-learning scheme to minimize the voltage required for plasma ignition, thereby reducing electric fields and minimizing arcing and coating erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-voltage pulse is applied to create plasma breakdown, then plasma ignition is achieved, but unnecessary stress on electronics and high electric fields are applied
Solution Approach 1:
The system dynamically adjusts the ignition voltage based on real-time plasma conditions and historical data. Instead of applying a fixed high voltage, the voltage is modulated according to the actual gas state, electron density, and breakdown requirements, thereby achieving reliable ignition while minimizing unnecessary stress on electronics.
Solution Approach 2:
The system implements feedback control by monitoring plasma ignition parameters and adjusting the ignition voltage accordingly. The self-learning scheme uses feedback from previous ignition attempts to optimize the voltage applied, ensuring sufficient voltage for breakdown while avoiding excessive voltage that would stress the electronics.
2Reliability
If high ignition voltage is chosen to account for unfavorable gas conditions, then plasma breakdown probability is increased, but electronics wear more quickly and arcing chances increase
Solution Approach 1:
The ignition voltage is dynamically adjusted based on detected gas conditions. When unfavorable conditions are detected (high pressure, low flow, contaminants), the system automatically increases the voltage to ensure breakdown. When conditions are favorable, the voltage is reduced, thereby extending electronics lifespan while maintaining adequate breakdown probability.
Solution Approach 2:
The system changes the ignition voltage parameter according to the detected gas state. By monitoring parameters such as gas pressure, flow rate, and composition, the system adapts the voltage level to match the actual breakdown requirements, avoiding both insufficient voltage (which would fail to ignite) and excessive voltage (which would wear electronics).
3Reliability
If high-voltage ignition pulse train is applied, then plasma ignition is achieved, but arcing and degradation occur generating particulate defects
Solution Approach 1:
The system applies only the voltage necessary to achieve plasma breakdown, avoiding excessive voltage that would cause arcing. By using a self-learning scheme to determine the minimum required voltage, the system achieves reliable ignition without the harmful effects of over-voltaging, thereby reducing particulate defect generation.
Solution Approach 2:
The system converts the potential harm of high voltage into a benefit by using controlled, optimized voltage pulses. Instead of applying continuously high voltage that causes arcing, the system uses precisely timed and sized voltage pulses that achieve breakdown efficiently, transforming what could be a harmful practice into a controlled, beneficial process.
4Device complexity
If fixed predetermined voltage is used for ignition, then ignition procedure is simple, but cannot adapt to varying gas conditions
Solution Approach 1:
The system performs self-diagnosis and self-adjustment of ignition voltage based on detected gas conditions. The self-learning scheme automatically adapts the voltage parameters without requiring complex external control, thereby maintaining relative simplicity while achieving high adaptability to varying gas conditions.
Solution Approach 2:
The system uses feedback from gas condition sensors and ignition outcome to automatically adjust the voltage parameters. This closed-loop control enables the system to adapt to varying conditions while maintaining a relatively simple control architecture, as the adjustment is automatic rather than requiring complex manual intervention.
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
The approach allows for efficient and reliable plasma ignition at lower voltages, reducing electronic stress, arcing, and coating damage, while providing diagnostic monitoring for plasma health and process control, ensuring high yield and extended equipment life.
Implementation Method 1
The high-voltage is applied, which can wear the electronics more quickly, and can increase the chances of arcing inside the plasma vessel. The high-voltage ignition pulse train can lead to arcing and degradation
Implementation Method 2
The high-voltage is applied, which can wear the electronics more quickly, and can increase the chances of arcing inside the plasma vessel. The high-voltage ignition pulse train can lead to arcing and degradation
Implementation Method 3
Ignition of plasma in an inductively coupled plasma (ICP) source or a transformer coupled plasma (TCP) source typically involves application of a high-voltage pulse
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An apparatus and method for determining the health of a plasma system by igniting a plasma within a plasma confining volume generate an ignition signal with an ignition circuit and apply the ignition signal between a biased region and a grounded region in the vicinity of the plasma confining volume. A parameter in the ignition circuit is sensed, and the sensed parameter is compared to a first parameter threshold. A condition associated with the plasma confining volume is determined if the sensed parameter differs from the first voltage threshold, and a corrective action can be taken.