Plasma Processing Control for Real-Time EEDF Optimization
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Solution Overview
Problem
Current plasma processing technologies face challenges in optimizing the electron energy distribution function (EEDF) of plasma within a processing container to achieve ideal conditions for efficient plasma processing, as existing methods lack effective control over EEDF variations due to process parameters.
Innovation Solution
A plasma processing apparatus equipped with a control device that measures the EEDF and adjusts parameters such as input power, frequency, gas mixture ratio, and pressure to align the measured EEDF with a target EEDF using a learning model and Bayes' theorem for continuous improvement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional plasma processing methods are used, then plasma processing can be performed, but the electron energy distribution function cannot be optimized to ideal conditions
Solution Approach 1:
The patent implements a feedback control mechanism where the EEDF measurer continuously monitors the electron energy distribution function during plasma processing, and the control device adjusts plasma parameters based on the measured EEDF to maintain optimal distribution. This closed-loop feedback system enables precise EEDF optimization without requiring overly complex external control systems.
Solution Approach 2:
The patent replaces complex mechanical or experimental methods for EEDF optimization with an information processing approach. The control device uses measured EEDF data and applied information (such as target EEDF profiles) to computationally determine optimal plasma parameters, substituting physical trial-and-error methods with intelligent control algorithms.
2Manufacturing precision
If extensive experimental setups are used to optimize plasma conditions, then EEDF can be controlled, but processing time and complexity increase
Solution Approach 1:
The patent applies preliminary action by storing target EEDF profiles and control algorithms in advance within the control device. Instead of performing extensive real-time experiments, the system has pre-programmed optimal EEDF targets and the computational methods to achieve them, allowing rapid parameter adjustment during plasma processing without time-consuming experimental setups.
Solution Approach 2:
The patent uses copying by storing ideal target EEDF profiles in the control device and using these as reference templates during processing. Rather than creating new experimental conditions each time, the system copies proven optimal EEDF profiles and adjusts parameters to match these stored templates, significantly reducing the time required for plasma condition optimization.
3Productivity
If real-time EEDF measurement and control is implemented, then plasma processing efficiency is enhanced, but measurement and control complexity increases
Solution Approach 1:
The patent achieves universality by designing the control device to perform multiple functions: it stores target EEDF profiles, processes real-time measurement data, computes optimal plasma parameters, and controls plasma generation. This multi-functional integrated approach allows real-time EEDF control without requiring separate specialized systems for each function, reducing overall measurement and control complexity while maintaining high processing efficiency.
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
This approach allows for real-time control of the EEDF, enhancing the accuracy and efficiency of plasma processing by iteratively updating the learning model based on measurement discrepancies, thereby optimizing plasma conditions without requiring extensive experimental setups.
Implementation Method 1
a plasma processing apparatus (100) includes a control device (3) and is configured to plasmarize gas supplied to an interior of a processing container (1)
Data Source
AI summary
A plasma processing apparatus includes a control device and configured to plasmarize a gas supplied to an interior of a processing container to perform a plasma processing on an object to be processed, wherein the control device includes: a measurer configured to measure an electron energy distribution function of plasma in the interior of the processing container, and a parameter changer configured to change parameters relating to the plasma processing so that the electron energy distribution function measured by the measurer during the plasma processing approaches a target electron energy distribution function.