Polymer-Derived SiC Purification via SiOC Precursor Conversion
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Solution Overview
Problem
Existing methods for producing high purity silicon carbide (SiC) are costly, inefficient, and unable to meet the demand for semiconductor-grade materials, due to contamination and high production costs.
Innovation Solution
A method involving the combination of a first liquid comprising silicon, carbon, and oxygen with a second liquid comprising carbon, followed by curing to form a cured SiOC solid material, which is then transformed into an ultra-pure polymer-derived SiC with less than 99.9999% impurities, and finally formed into a defect-free single crystal SiC structure by vapor deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to produce high purity silicon carbide, then production costs are high, but purity requirements are not met due to contamination
Solution Approach 1:
The patent changes the chemical composition parameters of the precursor material by incorporating specific ratios of silicon, carbon, and oxygen in the polysiloxane polymer structure. This compositional parameter change enables the material to transform into ultra-pure SiC with controlled impurity levels below 99.9999%, resolving the purity versus cost contradiction by achieving semiconductor-grade purity through precursor design rather than expensive post-processing
Solution Approach 2:
The patent utilizes phase transition from liquid precursor to cured solid SiOC material, and then to crystalline SiC through controlled thermal processing. This phase transition approach allows the material to self-purify during transformation, achieving ultra-high purity without requiring multiple expensive purification steps, thus resolving the contradiction between manufacturing precision and ease of manufacture
2Reliability
If existing production methods are used, then materials can be produced, but they contain contamination that prevents semiconductor-grade quality
Solution Approach 1:
The patent performs preliminary purification by designing the precursor composition to contain only silicon, carbon, and oxygen in controlled ratios. By establishing pure composition before the transformation process, the method prevents contamination from entering the system, achieving semiconductor-grade reliability while eliminating the harmful contamination factor that plagues conventional methods
Solution Approach 2:
The patent creates an inert chemical environment by using a polysiloxane-based precursor system that is inherently resistant to external contamination. The cured SiOC solid material and subsequent SiC transformation occur in a controlled chemical atmosphere that prevents introduction of harmful impurities, thereby ensuring semiconductor-grade quality and eliminating contamination issues
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 method achieves high purity SiC with impurity levels below 99.9999%, addressing the cost and contamination issues of existing methods, and enabling the production of high-quality semiconductor materials.
Implementation Method 1
transformed into an ultra-pure polymer-derived SiC
Implementation Method 2
formed into a defect-free single crystal SiC structure by vapor deposition
Data Source
AI summary
Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes and articles utilizing such high purity SiOC and SiC.