Plasma Chamber Coating for Erosion-Resistant Process Stability
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Solution Overview
Problem
Capacitively coupled plasma processing devices face issues with plasma facing surfaces erosion, leading to volatile byproducts, contamination, and process drift due to the use of silicon components, which require frequent replacement and surface roughness control challenges.
Innovation Solution
A metal component body with a plasma facing surface coated by a plasma spray coating of yttrium aluminum oxide, combined with an unsealed anodized layer, enhances erosion resistance and adhesion of polymer byproducts, reducing contamination and process drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If silicon components are used for plasma facing surfaces, then erosion forms volatile byproducts that do not contaminate the process, but the plasma facing surface requires periodic replacement and causes process drift
Solution Approach 1:
The patent applies composite materials by coating metal components (such as aluminum or stainless steel) with ceramic materials like silicon oxide, silicon nitride, or diamond-like carbon. This composite structure combines the erosion resistance and volatile byproduct formation of ceramics with the mechanical strength and cost-effectiveness of metals, thereby maintaining process stability while preventing contamination.
Solution Approach 2:
The patent changes the material parameters of the plasma-facing surface by applying coatings with specific physical and chemical properties. These coatings are designed to have low erosion rates, form volatile byproducts, and maintain surface roughness within controlled ranges (e.g., 0.5-5 micrometers), thus resolving the contradiction between contamination control and process stability.
2Object-generated harmful factors
If silicon components are used for plasma facing surfaces, then volatile byproducts are formed that do not contaminate, but frequent replacement of parts is required
Solution Approach 1:
By using composite materials consisting of metal substrates coated with erosion-resistant ceramics, the component lifetime is significantly extended. The metal substrate provides structural integrity while the ceramic coating resists plasma erosion and forms volatile byproducts, reducing the frequency of part replacement and maintaining high device availability.
Solution Approach 2:
The patent avoids using pure silicon components which, while effective at preventing contamination, have limited lifetime and require frequent replacement. Instead, the composite structure uses more durable metal substrates that can be replaced less frequently, improving productivity while still maintaining contamination control through the ceramic coating.
3Strength
If metal components are used for plasma facing surfaces, then erosion resistance is improved, but surface roughness control becomes challenging
Solution Approach 1:
The patent uses composite materials where a metal substrate provides erosion resistance and mechanical strength, while a ceramic or diamond-like carbon coating is applied to control surface roughness. The coating process parameters are optimized to achieve surface roughness within specific ranges (0.5-5 micrometers), resolving the contradiction between erosion resistance and surface precision.
Solution Approach 2:
The patent applies different surface treatments or coating thicknesses to different regions of the plasma-facing surface based on local requirements. Areas subject to higher erosion rates receive thicker or more erosion-resistant coatings, while areas requiring precise surface finish receive thinner coatings or additional surface finishing treatments, thus achieving both erosion resistance and surface roughness control.
4Strength
If coatings are applied to plasma facing surfaces, then erosion resistance is improved, but coating adhesion and uniformity become critical challenges
Solution Approach 1:
The patent employs composite material systems specifically designed for plasma-facing applications, such as plasma-sprayed ceramic coatings on metal substrates. The coating process (e.g., plasma spraying, CVD, PVD) is carefully controlled to ensure uniform thickness and strong adhesion, addressing the challenges of coating uniformity while maintaining erosion resistance.
Solution Approach 2:
The patent performs preliminary surface preparation of the metal substrate before applying the coating, including cleaning, roughening, or chemical treatment to enhance adhesion. This preliminary action ensures that the subsequent coating layer adheres uniformly and consistently across the entire plasma-facing surface, preventing defects and ensuring erosion resistance.
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 provides improved erosion resistance and controlled surface roughness, reducing the need for frequent replacements and maintaining process stability, while minimizing contamination and defects in semiconductor devices.
Implementation Method 1
a plasma spray coating over the plasma facing surface
Implementation Method 2
an unsealed anodized layer
Data Source
AI summary
An apparatus for processing a substrate is provided. A capacitively coupled plasma electrode is within a capacitively coupled plasma processing chamber. A plasma confinement component is within the capacitively coupled plasma processing chamber, wherein at least one of the capacitively coupled plasma electrode and plasma confinement component comprises a metal component body with a plasma facing surface and a plasma spray coating over the plasma facing surface.