Plasma Ignition Condition Calculation for Stable RF Startup
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Solution Overview
Problem
Existing plasma processing technologies require repetitive preliminary processes to find optimal ignition conditions, which are time-consuming and inefficient, especially when dealing with varying gas types, flow rates, pressures, and RF voltages.
Innovation Solution
An ignition condition calculation method that searches for and stores ignition condition information, including first plasma state information when plasma is ignited, and misfire condition information, including second plasma state information when plasma misfires, allowing for automatic calculation of optimal plasma ignition conditions based on Paschen's law.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetitive preliminary processes are used to find optimal ignition conditions, then plasma ignition stability is improved, but processing time is increased
Solution Approach 1:
The system performs preliminary measurement of plasma state information (reflected wave power, forward wave power, impedance) under various ignition conditions and stores this data in advance. When optimal ignition conditions are needed, the system retrieves and uses this pre-measured information instead of performing repetitive preliminary processes, thereby reducing processing time while maintaining ignition stability.
Solution Approach 2:
The system creates a database copy of plasma state information under different ignition conditions (gas types, flow rates, pressures, RF voltages). This copied data serves as a reference for automatically determining optimal ignition conditions without repeating time-consuming measurement processes, resolving the contradiction between reliability and time loss.
2Adaptability or versatility
If manual adjustment of ignition conditions is performed, then adaptability to varying process parameters is improved, but operational efficiency is reduced
Solution Approach 1:
The system automatically acquires plasma state information (reflected wave power, forward wave power, impedance) under various ignition conditions, compares this data against stored reference information, and automatically determines optimal ignition conditions. This feedback-based automatic control system adapts to varying process parameters (gas types, flow rates, pressures, RF voltages) while significantly improving operational efficiency by eliminating manual adjustment.
Solution Approach 2:
The system performs self-measurement and self-determination of optimal ignition conditions by automatically acquiring plasma state information and comparing it with stored data. This self-service capability enables the system to adapt to different process parameters autonomously, improving both adaptability and productivity simultaneously.
3Measurement precision
If extensive measurement of plasma state information is performed to ensure accurate ignition condition determination, then measurement precision is improved, but device complexity is increased
Solution Approach 1:
The system uses a multi-functional measurement approach where the same measurement apparatus measures multiple plasma state parameters (reflected wave power, forward wave power, impedance) simultaneously under various ignition conditions. The stored plasma state information serves multiple purposes: characterizing ignition conditions, determining optimal settings, and providing reference data for different process parameters. This universal measurement system achieves high measurement precision without proportionally increasing device complexity.
Data Source
AI summary
An ignition condition calculation method includes (A) searching for ignition condition information including first plasma state information when a plasma is ignited under a preset ignition condition, and storing the ignition condition information in a storage; (B) searching for misfire condition information including second plasma state information when the plasma misfires after the plasma has been ignited, and storing the misfire condition information in the storage; and (C) displaying the ignition condition information and the misfire condition information on a display.