Silicon Carbide: Properties of Wide Bandgap Material, Crystal Structure, Manufacturing

Silicon carbide (SiC) is a critical advanced wide bandgap material in modern industry and high-performance electronics. Composed of silicon and carbon, it exhibits exceptional mechanical hardness, thermal stability, and excellent semiconducting behavior. As a representative SiC semiconductor, its unique properties enable superior performance in high-temperature, high-voltage, and high-frequency environments compared to conventional silicon.

 

In recent years, global demand for energy-efficient systems has accelerated the adoption of silicon carbide. It has become a foundational material for electric vehicles, power electronics, renewable energy, aerospace, and industrial manufacturing. With continuous advancements in production, silicon carbide is rapidly replacing silicon in next-generation power devices.

What is Silicon Carbide?

Crystal Structure of Silicon Carbide

β-SiC (3C-SiC)

• Cubic zinc-blende crystal structure
• Low-temperature stable phase with high uniformity and low defects
• Ideal for epitaxial growth in high-performance SiC semiconductor devices

α-SiC (6H-SiC and 4H-SiC)

• Hexagonal crystal structure, stable at high temperatures
• 6H-SiC offers good electrical symmetry for radio-frequency and high-frequency applications
• 4H-SiC features high electron mobility and strong breakdown field strength, making it the mainstream substrate for power electronic devices

Manufacturing Processes of Silicon Carbide

Acheson Process

• Uses quartz sand and petroleum coke reacted at high temperatures in resistance furnaces
• Produces low-cost silicon carbide powders for abrasives, grinding tools, and industrial applications

Physical Vapor Transport (PVT)

• High-temperature sublimation and recrystallization of SiC powder
• Main method for growing high-purity 4H-SiC and 6H-SiC single crystals
• Critical for manufacturing SiC semiconductor wafers and power device substrates

Chemical Vapor Deposition (CVD)

• Used for high-quality epitaxial layers and thin-film SiC components
• Enables low-defect growth for high-performance power electronics

Sintering & Reaction-Bonding Processes

• Sintered SiC: High-temperature densification for structural components with excellent wear resistance
• Reaction-bonded SiC (RB-SiC): In-situ reaction of molten silicon and carbon for complex-shaped parts used in aerospace and high-temperature equipment

Types of Silicon Carbide

Black Silicon Carbide

Green Silicon Carbide

Sintered Silicon Carbide

Reaction-Bonded Silicon Carbide (RB-SiC)

Applications of Silicon Carbide

Industrial Machining & Wear Resistance

Power Electronics

Electric Vehicles (EVs)

Aerospace & Defense

Renewable Energy Systems

Silicon Carbide vs Silicon: Key Performance Comparison

Property	Silicon Carbide (SiC)	Silicon (Si)
Bandgap	Wide bandgap material: 2.8–3.2 eV	1.12 eV
Breakdown Field	~2.8 MV/cm	~0.3 MV/cm
Thermal Conductivity	Excellent, supports high-temperature operation	Low, requires heavy cooling
Switching Loss	Extremely low	Relatively high
Max Operating Temp	Stable above 600℃	Typically below 150℃
Main Applications	SiC semiconductor, power electronics, EVs	Consumer electronics, low-voltage devices

 

Silicon remains dominant in consumer electronics, while silicon carbide is the preferred wide bandgap material for high-power and high-efficiency systems.

 

 

 

 

 

 

Silicon carbide, as an advanced wide bandgap material, delivers exceptional SiC properties and enables high-performance SiC semiconductor devices critical to electric vehicles, power electronics, aerospace, and renewable energy. Its superior performance over silicon makes it essential for next-generation energy-efficient systems.

 

As manufacturing technologies mature and costs decline, silicon carbide will continue expanding into high-power applications. For customized material and cell development solutions, visit our Cell Customization Services.