Plasma RF Frequency Tuning for Impedance Match and Low Reflection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plasma processing apparatuses face challenges in reducing the reflection of radio-frequency power used for generating plasma, which affects the efficiency and effectiveness of the plasma processing.
Innovation Solution
A plasma processing apparatus that adjusts the frequencies of radio-frequency power in synchronized cycles using a controller to match impedance between the power supply and the load, employing time series adjustments such as phase shifts, scaling, or multiple time zone modifications to minimize power reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If radio-frequency power is provided to generate plasma, then plasma generation is achieved, but radio-frequency power reflection occurs reducing efficiency
Solution Approach 1:
The patent applies dynamics by making the radio-frequency power supply frequency variable and adjustable in real-time. The frequency is dynamically changed based on impedance matching requirements, allowing the system to adapt to changing plasma conditions and minimize power reflection, thereby resolving the contradiction between energy loss and plasma generation efficiency.
Solution Approach 2:
The patent employs parameter changes by modifying the frequency parameter of the radio-frequency power supply. By adjusting the frequency to match the impedance of the plasma load, the system optimizes power transfer and reduces reflection, directly addressing the technical contradiction between minimizing energy loss and maintaining high productivity.
2Loss of energy
If impedance matching is optimized, then radio-frequency power reflection is reduced, but system complexity increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the impedance matching condition and automatically adjusting the radio-frequency power supply frequency accordingly. This closed-loop control system reduces the need for complex manual adjustment mechanisms while effectively minimizing power reflection, thus resolving the contradiction between energy loss reduction and system complexity.
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 apparatus effectively reduces radio-frequency power reflection, enhancing plasma generation efficiency and process control by optimizing impedance matching.
Implementation Method 1
a radio-frequency power supply configured to provide radio-frequency power to generate plasma from a gas in the chamber
Implementation Method 2
a bias power supply configured to provide electrical bias energy to the substrate support to draw ions toward a substrate on the substrate support
Data Source
AI summary
In a plasma processing apparatus, a radio-frequency power supply adjusts frequencies of radio-frequency power in each bias cycle of electrical bias energy. The radio-frequency power supply uses a reference time series of frequencies of the radio-frequency power in each bias cycle. The radio-frequency power supply repeats using a changed time series of frequencies of the radio-frequency power in each bias cycle to increase a degree of match based on an evaluation value. The changed time series results from shifting the reference time series by a phase shift amount, scaling the reference time series in a frequency direction, or scaling two or more of multiple time zones of the reference time series in a time direction.