Silicon Oxide Coating via Dimethylsilane CVD for Semiconductor Reliability
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Solution Overview
Problem
Semiconductor fabrication processes face challenges due to surface degradation, chemical adsorption, catalytic activity, corrosion, and contamination issues, particularly with silicon hydride-based coatings that are difficult to remove and susceptible to dissolution by caustic media, limiting their applicability.
Innovation Solution
A semiconductor fabrication process involving chemical vapor deposition of dimethylsilane to form a coated article with a substrate, followed by decomposition and functionalization, which imparts properties such as hardness, inertness, and chemical resistance, reducing metal ion contamination and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silicon hydride-based coatings are applied to protect surfaces, then wear resistance and surface protection are improved, but the coatings become susceptible to dissolution by caustic high pH media
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by using silicon oxide (SiO2) instead of silicon hydride (SiH4) as the precursor material. This fundamental parameter change transforms the coating's chemical properties, making it resistant to caustic high pH media while maintaining wear resistance and other protective characteristics.
Solution Approach 2:
The patent creates a composite coating system that combines silicon oxide with other materials to achieve both wear resistance and chemical resistance. The resulting coating is a composite structure that leverages the hardness and wear resistance of silicon oxide while incorporating components that provide resistance to caustic environments.
2Ease of manufacture
If metal catalysts are used in silicon hydride surface reactions, then coating formation is improved, but complete removal of the catalyst becomes difficult and re-introduces undesirable surface activity
Solution Approach 1:
The patent extracts and eliminates the metal catalyst component from the coating process entirely. By using silicon oxide as the precursor instead of silicon hydride with metal catalyst, the process removes the source of catalyst contamination while still achieving effective coating formation through alternative mechanisms.
Solution Approach 2:
The patent introduces silicon oxide as an intermediary material that replaces the need for metal catalysts. This intermediary substance enables coating formation through thermal decomposition and chemical vapor deposition processes without requiring harmful metal catalysts, thus eliminating catalyst contamination issues.
3Ease of manufacture
If conventional CVD processes are used to deposit coatings, then coating application is achieved, but molecules including silicon, carbon, and hydrogen are considered undesirable and require additional depositional energies
Solution Approach 1:
The patent changes the deposition parameters by using silicon oxide as the precursor material, which allows for lower deposition temperatures and reduced energy requirements. The silicon oxide-based process enables thermal CVD at more manageable temperature ranges compared to traditional silicon hydride processes that require plasma or microwave fields.
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 process results in coatings with enhanced hardness, inertness, and chemical resistance, reducing surface degradation and contamination, thereby improving the reliability and durability of semiconductor products.
Implementation Method 1
a layer applied to the substrate by decomposition of dimethylsilane through chemical vapor deposition
Data Source
AI summary
Semiconductor fabrication processes are described. An embodiment of the semiconductor fabrication process includes providing a layer formed by decomposition of dimethylsilane through chemical vapor deposition, the layer being applied by a fluid material, and then positioning the layer in a system for producing a semiconductor product. Additionally or alternatively, the semiconductor product is produced and/or the layer is on a substrate.