Doped SiC via Polysilocarb Pyrolysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing high purity silicon carbide (SiC) are costly, inefficient, and unable to meet the demand for semiconductor-grade materials due to contamination issues and high production costs, limiting its widespread application.
Innovation Solution
Development of polysilocarb-derived silicon carbide compositions and processes that produce submicron-sized particles with impurities below 100 ppm, achieving purities of at least 99.9999%, eliminating the need for sintering aids and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to produce high purity silicon carbide, then purity can be improved, but production cost increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the precursor material by incorporating specific dopants (boron, phosphorus, aluminum) at controlled concentrations during the polysilocarb synthesis stage, rather than attempting to achieve purity through costly post-processing of conventional SiC. This parameter change in the precursor formulation enables direct production of high-purity, doped SiC at lower cost.
Solution Approach 2:
The patent performs preliminary doping action during the precursor material synthesis and pyrolysis stages, incorporating desired dopant elements into the polysilocarb structure before SiC formation. This preliminary action eliminates the need for subsequent expensive doping processes and purification steps, achieving both high purity and cost-effectiveness.
2Quantity of substance
If conventional SiC production methods are used, then material can be produced, but contamination occurs limiting semiconductor applications
Solution Approach 1:
The patent employs an inert pyrolysis atmosphere (nitrogen or argon) to prevent oxidation and contamination of the SiC material during production. This inert environment maintains material purity by excluding reactive gases that could introduce contaminants, enabling semiconductor-grade quality without compromising production capability.
Solution Approach 2:
The patent uses polysilocarb as a molecular precursor that copies the desired SiC crystal structure and dopant distribution during pyrolysis. This copying mechanism ensures uniform dopant placement and structural fidelity, producing contamination-free material suitable for semiconductor applications while maintaining efficient production.
3Manufacturing precision
If polysilocarb-derived SiC is produced, then purity above 99.9999% is achieved, but new production process complexity is introduced
Solution Approach 1:
The patent merges multiple functions into a single pyrolysis step: precursor decomposition, SiC formation, dopant incorporation, and purity achievement all occur simultaneously during one controlled heating process. This merging eliminates the need for separate purification, doping, and sintering steps, reducing overall process complexity while achieving ultra-high purity.
Solution Approach 2:
The polysilocarb precursor is designed to self-organize and self-assemble into the desired SiC crystal structure with embedded dopants during pyrolysis, without requiring external intervention for dopant placement or structural formation. This self-service capability simplifies the production process while maintaining ultra-high purity standards.
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 polysilocarb-derived silicon carbide compositions achieve high purity and strength, enabling applications in semiconductors, electronics, and other industries where high-purity SiC was previously unviable due to cost and contamination concerns.
Implementation Method 1
polysilocarb-derived silicon carbide compositions and processes that produce submicron-sized particles with impurities below 100 ppm
Data Source
AI summary
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. Doped SiOC and SiC materials for providing semiconductor properties to SiC wafers, including p- and n-type properties.