Matching Device Impedance Control for Plasma Harmonics
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Solution Overview
Problem
Existing plasma processing apparatuses face challenges in controlling high harmonic components without using sensors, which affects process consistency and efficiency.
Innovation Solution
A method that involves acquiring output impedance of the matching device, obtaining F-parameters indicating electrical characteristics, calculating the degree of high harmonic component generation, and adjusting the output impedance of the matching device to control high harmonic component generation, eliminating the need for sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If impedance sensors are installed to observe high harmonic components, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The matching device automatically adjusts its own impedance settings to control high harmonic component generation. The control unit calculates the degree of high harmonic generation based on acquired impedance data and F-parameters, then autonomously controls the matching device's output impedance without requiring external sensors or manual intervention.
Solution Approach 2:
The control unit acts as an intermediary that processes impedance data and F-parameters to determine optimal matching device settings. It mediates between the measured electrical characteristics and the actual impedance adjustment, enabling indirect control of high harmonic components through calculated relationships rather than direct sensor measurement.
2Manufacturing precision
If impedance of matching device is adjusted to control high harmonic components, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The system controls high harmonic component generation by changing the output impedance parameters of the matching device. The control unit calculates the degree of high harmonic generation and adjusts the matching device's impedance settings accordingly, using parameter optimization to achieve process uniformity without adding complex hardware.
Solution Approach 2:
The control unit serves multiple functions: it acquires impedance data, obtains F-parameters, calculates high harmonic generation degree, and controls matching device settings. This multi-functional approach consolidates what could be separate complex systems into a single integrated control unit, reducing overall device complexity while maintaining precision.
3Reliability
If sensors are used to observe high harmonic components, then reliability is improved, but loss of time increases
Solution Approach 1:
The system performs preliminary calculation of the high harmonic generation degree using acquired impedance data and F-parameters before actual processing. By pre-calculating the optimal matching device settings based on electrical characteristics, the system avoids time-consuming iterative adjustments during production while ensuring reliable process consistency.
Solution Approach 2:
The control unit uses feedback from acquired impedance data and F-parameters to automatically adjust matching device settings. This closed-loop feedback mechanism ensures consistent process reliability by continuously monitoring and adjusting based on actual electrical characteristics, eliminating the need for manual measurement and adjustment cycles.
Data Source
AI summary
There is provision of a method of controlling a plasma processing apparatus including a chamber in which a plasma is generated, a substrate holder, a radio frequency power supply configured to supply radio frequency electric power to the substrate holder, a matching device provided between the substrate holder and the radio frequency power supply. The method includes acquiring output impedance of the matching device in a state in which impedance matching is achieved; obtaining F-parameters indicating electrical characteristics of the chamber; calculating a degree of high harmonic component generation; and controlling the output impedance of the matching device based on the degree of high harmonic component generation.