Patterned Plasma Electrodes for Vacuum Treatment Stability
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Solution Overview
Problem
Vacuum plasma treatment processes experience instability due to material deposition on plasma electrodes, leading to long-term drifting and process destabilization, especially when the deposited material has lower conductivity than the electrode material, causing issues like 'buried' or 'vanishing' electrodes.
Innovation Solution
A vacuum plasma treatment apparatus with patterned plasma electrodes, where non-contributing surface areas are designed to prevent plasma burning and deposition, while plasma-effective areas maintain cleanliness, focusing the electric field and current path to prevent material buildup and ensure stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plasma electrodes are used for substrate treatment, then plasma treatment function is achieved, but material deposits on electrodes causing process instability
Solution Approach 1:
The plasma electrode surface is segmented into functionally distinct areas: plasma-effective areas that generate and maintain plasma, and non-contributing surface areas that are predominantly coated with deposited material. This segmentation prevents material buildup on plasma-effective areas while accommodating deposition on non-contributing areas, thereby maintaining process stability.
Solution Approach 2:
Different surface areas of the plasma electrode are assigned different functional qualities. Plasma-effective areas maintain cleanliness and active plasma generation, while non-contributing surface areas are designed to accept material deposition. This local differentiation of surface properties resolves the contradiction by allowing deposition without compromising plasma treatment functionality.
2Shape
If material deposits on plasma electrode, then electrode surface area changes, but plasma electrode effect becomes unstable
Solution Approach 1:
The electrode surface is divided into plasma-effective areas that maintain stable plasma generation and non-contributing surface areas that accommodate shape changes due to deposition. This segmentation isolates the harmful shape changes to non-critical areas, preserving plasma effect stability.
Solution Approach 2:
The electrode surface exhibits local quality differentiation where plasma-effective areas maintain consistent plasma generation properties while non-contributing surface areas undergo shape changes. This local quality assignment allows shape changes without compromising overall plasma electrode effect stability.
3Quantity of substance
If deposited material has lower conductivity than electrode material, then electrode conductivity decreases, but process destabilization increases
Solution Approach 1:
The electrode surface is segmented to concentrate deposited material on non-contributing surface areas while keeping plasma-effective areas clean. This segmentation prevents conductivity-reducing deposition on functionally critical areas, maintaining process stability despite overall material accumulation on the electrode.
Solution Approach 2:
Different surface areas have different functional requirements regarding conductivity. Plasma-effective areas require high conductivity for stable plasma generation, while non-contributing surface areas can tolerate lower conductivity from deposition. This local quality differentiation allows material accumulation without compromising overall process stability.
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 effectively prevents material deposition on plasma-effective areas, maintaining electrode cleanliness and stability, thus reducing process drifting and ensuring consistent plasma treatment performance.
Implementation Method 1
at least one first and at least one second plasma electrode for generating a plasma therebetween... an electric plasma supply source arrangement which establishes a first electric potential to the first plasma electrode and a second electric potential to the second plasma electrode
Implementation Method 2
there is generated, in a reaction space to which the plasma electrodes are exposed, a material which deposits on at least one of the plasma electrodes
Data Source
AI summary
In a vacuum treatment recipient, a plasma is generated between a first plasma electrode and a second plasma electrode so as to perform a vacuum plasma treatment of a substrate. To minimize at least one of the two plasma electrodes to be buried by a deposition of material resulting from the treatment process, that electrode is provided with a surface pattern of areas which do not contribute to the plasma electrode effect and of areas which are plasma electrode effective. The current path between the two electrodes is concentrated on the distinct areas which are plasma electrode effective, leading to an ongoing sputter- cleaning of these areas.