Plasma Resonator Waveguide Layout for Uniform Substrate Processing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current plasma processing apparatuses face challenges in efficiently generating and maintaining uniform plasma across the substrate due to limitations in waveguide design and impedance matching, particularly with limited frequency range adjustments.
Innovation Solution
The apparatus incorporates a resonator with a waveguide longer than half the wavelength of electromagnetic waves, featuring a zigzag pattern and a coaxial connector for adjustable impedance matching, along with a dielectric introducer for electromagnetic wave propagation, enabling uniform plasma generation across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional waveguide design is used, then the structure is simple, but plasma uniformity and impedance matching are insufficient
Solution Approach 1:
The waveguide is divided into multiple sections with different cross-sectional dimensions along its length. Each section has specific width and height parameters that vary progressively, allowing impedance transformation and improved plasma uniformity without requiring complex external matching networks
Solution Approach 2:
The waveguide dimensions (width and height) are systematically changed along its length to transform impedance and optimize electromagnetic field distribution. This parameter variation enables better plasma uniformity across the substrate while maintaining a relatively simple overall structure
2Adaptability or versatility
If the frequency range is limited, then the device is simpler to control, but impedance matching and plasma generation efficiency are reduced
Solution Approach 1:
The waveguide structure incorporates variable dimensions that can be adjusted to optimize performance across different frequencies. The progressive change in cross-sectional parameters allows the waveguide to adapt to a broader frequency range while maintaining impedance matching without requiring complex active control mechanisms
3Manufacturing precision
If a waveguide length of 1/2 wavelength or less is used, then the structure is more compact, but plasma uniformity across the substrate is insufficient
Solution Approach 1:
Different sections of the waveguide have different cross-sectional dimensions optimized for local electromagnetic field distribution. This local optimization ensures uniform plasma generation across the entire substrate area, with each section contributing to the overall uniformity in its specific region
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 configuration allows for efficient plasma generation and impedance matching across a broader frequency range, ensuring consistent plasma uniformity and stability during processing.
Implementation Method 1
a resonator including a waveguide for propagation of the electromagnetic waves to the introducer
Implementation Method 2
an introducer made of a dielectric material and configured to introduce electromagnetic waves into the plasma generation space
Implementation Method 3
a second electrode provided above the processing space and below the first electrode, the second electrode providing a plasma generation space between the first electrode and the second electrode
Data Source
AI summary
A plasma processing apparatus includes: a chamber providing a processing space; a substrate support provided inside the processing space; a first electrode provided above the processing space; a second electrode provided above the processing space and below the first electrode, the second electrode providing a plasma generation space between the first electrode and the second electrode and providing a plurality of through-holes to guide active species generated in the plasma generation space into the processing space; an introducer made of a dielectric material and configured to introduce electromagnetic waves into the plasma generation space; and a resonator including a waveguide for propagation of the electromagnetic waves to the introducer, wherein the waveguide has a length longer than ½ of a wavelength of the electromagnetic waves in the waveguide.