The CVD Silicon Carbide (SiC) Ring is a semiconductor-grade plasma-resistant component designed for advanced etching, deposition, and plasma processing systems. Manufactured using high-purity Chemical Vapor Deposition (CVD) Silicon Carbide technology, the ring delivers exceptional resistance to plasma erosion, corrosive process gases, and thermal degradation in demanding semiconductor manufacturing environments.

SiC rings are widely used as focus rings, edge rings, chamber liner rings, and protective rings in ICP, RIE, PECVD, and other plasma-intensive semiconductor tools. Their primary function is to optimize plasma distribution, stabilize wafer edge processing, and protect critical chamber components from direct plasma exposure.

Compared with traditional silicon rings, CVD SiC rings offer significantly longer operational lifetime, lower particle contamination, and improved process consistency, making them essential consumable components for advanced semiconductor production lines.

Why CVD SiC Rings Are Important in Plasma Chambers

During semiconductor plasma processing, chamber components are continuously exposed to:

• High-energy ion bombardment
• Fluorine-based gases (CF₄, SF₆, NF₃)
• Chlorine-based chemistries (Cl₂, HBr)
• Elevated temperatures
• Aggressive plasma corrosion

Under these harsh conditions, conventional silicon components gradually experience:

• Surface erosion
• Particle generation
• Dimensional degradation
• Plasma instability

CVD SiC rings provide a much more durable and stable solution due to their dense microstructure, ultra-high purity, and superior chemical resistance.

Main Functions of SiC Rings

Plasma Distribution Control

SiC focus rings and edge rings help optimize plasma uniformity around the wafer edge, improving etching consistency and critical dimension control.

Chamber Protection

Installed as protective liner rings, they shield critical chamber surfaces from direct plasma attack, extending overall chamber component lifetime.

Process Stability Enhancement

Stable material properties help maintain consistent plasma behavior during long production cycles.

Contamination Reduction

The dense CVD SiC structure minimizes micro-particle generation, supporting cleaner semiconductor manufacturing environments.

Key Advantages of CVD SiC Rings

Outstanding Plasma Erosion Resistance

CVD SiC demonstrates exceptional durability in fluorine- and chlorine-based plasma environments, significantly outperforming conventional silicon materials.

Ultra-Long Operational Lifetime

Compared with silicon rings, SiC rings typically achieve:

• 3–10× longer service life
• Lower replacement frequency
• Reduced chamber downtime
• Improved production efficiency

High Thermal Stability

Excellent thermal conductivity and low thermal deformation allow stable performance in high-temperature plasma processes.

Low Particle Generation

The dense, high-purity structure reduces contamination risks and helps improve wafer yield.

Excellent Chemical Resistance

SiC offers strong resistance to corrosive semiconductor gases and reactive plasma chemistries.

Precision Semiconductor-Grade Machining

Manufactured with tight dimensional tolerances for seamless integration into advanced semiconductor equipment.

Technical Specifications

Typical Semiconductor Applications

ICP & RIE Plasma Etching Systems

Used as focus rings and edge rings in high-density plasma etching chambers.

PECVD & CVD Equipment

Provides chamber protection and plasma stability in deposition systems.

Semiconductor Chamber Protection

Acts as liner rings and protective components for plasma-facing chamber surfaces.

Advanced Semiconductor Manufacturing

Suitable for advanced nodes and high-throughput wafer fabrication environments.

High-Power Plasma Processing

Excellent durability under extended plasma exposure conditions.

Types of SiC Rings

Depending on equipment design and process requirements, SiC rings may be used as:

• Focus Rings
• Edge Rings
• Chamber Liner Rings
• Plasma Protection Rings
• Wafer Guide Rings
• Shield Rings

Custom structural designs are available according to customer drawings and chamber configurations.

Advantages Over Traditional Silicon Rings

Although the initial investment is higher, SiC rings often provide lower overall operating cost due to extended lifetime and reduced maintenance requirements.

Customization Options

Customized semiconductor-grade SiC rings are available with:

• Custom diameters and thicknesses
• Precision groove structures
• Surface polishing
• Resistivity adjustment
• Complex edge profiles
• OEM drawing-based production

Benefits for Semiconductor Fabs

✔ Improved plasma process stability
✔ Longer chamber component lifetime
✔ Lower contamination risk
✔ Reduced maintenance downtime
✔ Better wafer edge uniformity
✔ Lower total operating cost
✔ Suitable for aggressive plasma chemistries

FAQ

Q1: Is the SiC ring a consumable component?

Yes. SiC rings are classified as semiconductor consumables, but they offer substantially longer lifetime compared with silicon components.

Q2: Why is CVD SiC preferred for plasma chamber rings?

CVD SiC provides ultra-high purity, dense structure, superior plasma resistance, and excellent chemical stability under aggressive semiconductor process conditions.

Q3: Can the ring dimensions be customized?

Yes. Diameter, thickness, resistivity, groove design, and surface finish can all be customized according to equipment specifications or technical drawings.

Q4: How much longer does a SiC ring last compared with silicon?

Depending on process conditions, SiC rings typically last 3–10 times longer than traditional silicon rings.

Q5: What semiconductor processes use SiC rings?

They are widely used in:

• ICP etching
• RIE plasma systems
• PECVD chambers
• CVD processing
• Plasma cleaning systems
• Advanced wafer fabrication equipment