Dielectric Coating for Hidden Surfaces With Uniform CVD Thickness
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Solution Overview
Problem
Existing thermal chemical vapor deposition (CVD) methods lack the precision and consistency in producing dielectric coatings, leading to variations in thickness and composition, which are crucial for applications requiring uniformity and reliability.
Innovation Solution
The development of dielectric coatings using static thermal CVD with specific precursors, such as silane and oxidizers, applied to hidden and visible surfaces of substrates, achieving thicknesses between 50 nanometers and 2,000 nanometers, and compositions with high silicon content, enhancing properties like inertness, resistance to sulfur adsorption, and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermal chemical vapor deposition (CVD) is used to produce dielectric coatings, then the process is simpler and more cost-effective, but the precision and consistency of coating thickness and composition deteriorate
Solution Approach 1:
The patent changes the fundamental deposition parameter from continuous CVD to cyclic ALD process, where precursors are introduced sequentially in controlled cycles. This parameter change enables precise control over coating thickness at the nanometer scale while maintaining composition consistency, resolving the contradiction between process simplicity and manufacturing precision.
Solution Approach 2:
The patent implements periodic action through cyclic ALD processes where precursor introduction, reaction, and purge steps are repeated in cycles. Each cycle deposits a controlled amount of material, and by adjusting the number of cycles, precise thickness control is achieved while maintaining compositional uniformity throughout the coating.
2Manufacturing precision
If atomic layer deposition (ALD) is used to produce dielectric coatings, then the precision and uniformity of coating thickness improve, but the process complexity increases
Solution Approach 1:
The patent applies self-service through self-limiting surface reactions in ALD processes. Each precursor cycle automatically terminates when surface sites are saturated, providing inherent feedback control that ensures uniform thickness without requiring complex real-time monitoring or adjustment mechanisms, thus reducing process complexity while maintaining high precision.
Solution Approach 2:
The patent implements feedback control through the self-limiting nature of ALD reactions and in-situ monitoring techniques. The process automatically adjusts deposition based on surface saturation signals, ensuring consistent thickness uniformity across the substrate while maintaining relatively simple process equipment compared to other high-precision deposition methods.
3Area of stationary object
If dielectric coatings are applied to complex geometries with hidden surfaces, then coverage of all surfaces is achieved, but coating uniformity on different surfaces deteriorates
Solution Approach 1:
The patent implements continuous precursor exposure in ALD processes, allowing precursors to continuously interact with all accessible surfaces including hidden areas. The cyclic nature ensures that all surfaces receive equivalent treatment over multiple cycles, achieving both complete coverage and uniform thickness even on complex geometries with varying surface accessibility.
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 dielectric coatings with consistent thickness and composition, improving adhesion, reducing delamination, and enhancing resistance to sulfur adsorption and corrosion, suitable for complex geometries and plasma environments.
Implementation Method 1
thermal chemical vapor deposition (CVD)
Implementation Method 2
bulk resistivity of at least 10^8 Ω·cm
Data Source
AI summary
Dielectric coatings, articles having dielectric coatings, and systems including coating having dielectric coatings are disclosed. The dielectric article includes a substrate having hidden surfaces and a dielectric coating on the hidden surfaces of the substrate. The dielectric coating has a bulk resistivity of at least 108 Ω·cm and a thickness of between 30 nanometers and 3,000 nanometers.