Planar Electrode Layout for Uniform Plasma Source Etching
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Solution Overview
Problem
Existing vacuum chambers for plasma treatments face limitations in achieving efficient and homogeneous plasma distribution due to the design of linear electrodes, which restricts the adjustability and homogeneity of plasma treatment processes.
Innovation Solution
The use of a vacuum chamber with a plasma source featuring multiple two-dimensional electrodes arranged on the chamber walls, allowing for adjustable plasma distribution and improved etching depth and homogeneity, along with a magnet system to control plasma distribution, and the ability to operate electrodes as both anodes and cathodes for enhanced plasma generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If linear electrodes are used in the vacuum chamber, then the electrode design is simple and easy to maintain, but the plasma distribution homogeneity and treatment efficiency are limited
Solution Approach 1:
The patent transitions from traditional linear electrodes to two-dimensional planar electrodes with specific aspect ratios (0.4-1.0). This dimensional change allows the electrodes to be arranged on chamber walls in a planar configuration, creating more uniform electric field distribution and improving plasma homogeneity across the treatment area while maintaining manageable complexity through standardized geometric ratios.
2Productivity
If electrodes protrude into the treatment chamber to improve plasma generation efficiency, then plasma generation efficiency increases, but the electrode arrangement becomes complex and disrupts the treatment space
Solution Approach 1:
The patent positions two-dimensional planar electrodes on the chamber walls rather than having them protrude into the treatment chamber. This wall-mounted planar arrangement maintains plasma generation efficiency through large surface area exposure while preserving treatment space and simplifying the overall electrode arrangement compared to protruding configurations.
3Power
If high power densities are applied to electrodes to improve plasma treatment effectiveness, then treatment effectiveness increases, but the electrodes require complex cooling and maintenance systems
Solution Approach 1:
The patent employs switchable power supply connections that allow electrodes to function as either anodes or cathodes depending on treatment requirements. This multi-functionality enables high power density application for effective plasma generation while using the same electrode structure for both electron emission and collection, reducing the need for specialized high-power components and simplifying maintenance requirements.
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 enables better control over plasma generation and distribution, improving the efficiency and homogeneity of plasma treatments, allowing for more effective ion cleaning and coating processes, such as DLC layer application, while maintaining a non-disruptive and easily maintainable electrode design.
Implementation Method 1
a cathode for cathodic vacuum arc evaporation with an arc anode connected to the chamber
Implementation Method 2
the resulting gas plasma can be used for various plasma treatments of substrates. For example, the resulting inert gas ions (e.g., argon ions) are used for ion cleaning of the substrates
Implementation Method 3
a shield for shielding particles and metal ions emitted by the cathode
Data Source
Figure 1
Figure 2~2a
Figure 2b~2c
AI summary
In order to improve the etching depth and/or the etching uniformity of a substrate, a plasma source having one or more evaporators and two or more electrodes according to the invention is proposed. The use of more than one electrode makes it possible to use different currents at the electrodes and time-selective application of the currents, allowing improved control of plasma generation.