RF Power Distribution Device for Capacitively-Coupled Plasma
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Solution Overview
Problem
Existing RF power distribution systems face challenges in maintaining stable impedance matching and uniform plasma generation when multiple electrodes are used, particularly due to mutual interference between RF power sources operating at the same frequency, which affects plasma process stability and uniformity.
Innovation Solution
A power distribution device employing a single impedance matching network and a power distribution unit with reactive elements and a variable capacitor to distribute RF power efficiently to multiple electrodes, allowing for simultaneous or sequential generation of capacitively-coupled plasmas, while maintaining stable impedance matching and controlling power, voltage, or current to each electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple RF power sources operating at the same frequency are used for multiple electrodes, then power can be supplied to multiple electrodes, but mutual interference occurs making it difficult to stably perform plasma process
Solution Approach 1:
The invention divides the power supply system into multiple independent impedance matching networks, each dedicated to a specific electrode. This segmentation prevents mutual interference between RF power sources by providing electrical isolation through separate matching networks, thereby maintaining plasma process stability while enabling power supply to multiple electrodes simultaneously
Solution Approach 2:
The impedance matching network serves as an intermediary device between the RF power source and the electrode. It acts as a buffer that isolates the RF power source from direct interaction with other electrodes, preventing mutual interference while still enabling effective power transfer to the designated electrode for stable plasma generation
2Manufacturing precision
If an electrode is divided into a plurality of electrodes to adjust uniformity, then plasma uniformity can be improved, but impedance matching becomes difficult to maintain
Solution Approach 1:
Each divided electrode is assigned its own impedance matching network, segmenting the impedance matching function across multiple independent units. This allows each matching network to be optimized for its specific electrode while maintaining overall system simplicity, enabling plasma uniformity adjustment through electrode division without increasing overall complexity
Solution Approach 2:
The invention employs multiple identical or similar impedance matching networks that can be configured in standardized ways. This universal approach allows the system to handle multiple electrodes with uniformity requirements using the same basic building block, simplifying the overall impedance matching complexity despite the increased number of electrodes
3Manufacturing precision
If power is applied to one electrode at a plurality of positions, then plasma uniformity can be enhanced, but suitable power distribution means is lacking
Solution Approach 1:
The electrode is divided into multiple segments or positions, each connected to its own impedance matching network. This segmentation enables independent power control at different positions on the electrode, allowing precise power distribution to achieve uniform plasma generation across the entire electrode surface
Solution Approach 2:
The invention enables dynamic power distribution by allowing different RF power levels to be applied to different electrode positions through their respective impedance matching networks. This dynamic control capability provides the versatility needed to adjust power at multiple positions to achieve optimal plasma uniformity
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 solution enables stable and uniform plasma generation across multiple electrodes, improving process stability and reliability by maintaining constant impedance and allowing for adjustable power distribution ratios, thus enhancing plasma and process uniformity.
Implementation Method 1
a variable capacitor having one end connected in parallel to the first reactive element and the first electrode and the other end grounded
Implementation Method 2
a power distribution unit configured to distribute the output power from the impedance matching network to at least one electrode generating capacitively-coupled plasma
Data Source
AI summary
Provided are an RF power distribution device and an RF power distribution method. The RF power distribution device includes an impedance matching network for transferring power from an RF power source and a power distribution unit for distributing the output power from the impedance matching network to at least one electrode generating capacitively-coupled plasma. The power distribution unit includes a first reactive element connected in series to a first electrode, a variable capacitor having one end connected in parallel to the first reactive element and the first electrode and the other end grounded, and a second reactive element having one end connected to a first node where the one end of the variable capacitor and one end of the first reactance device are in contact with each other and the other end connected to a second node where a second electrode and an output terminal of the impedance matching network are connected.