In the complex ecosystem of semiconductor fabrication, thermal stability is the foundation of quality. Whether growing Silicon Carbide (SiC) ingots or depositing epitaxial layers for GaN power devices, the heating element must provide absolute precision. Our Graphite Heaters are engineered to be the reliable thermal core of your reactor, designed to maintain structural integrity up to 2,000°C.
1. Material Excellence: High-Purity Isostatic Graphite
The performance of a heater begins with its substrate. At Semicorex, we utilize only the finest isostatic graphite, formed under equal pressure from all sides to ensure:
- Uniform Electrical Resistance: Eliminates localized "hot spots" that cause non-uniform wafer growth.
- Fine-Grain Structure: Superior mechanical strength allows for intricate CNC machining of serpentine paths.
- Ultra-Low Ash Content: Purification processes reduce metallic impurities to < 5 ppm, preventing contamination.
2. Geometric Engineering for Thermal Uniformity
Our heaters feature a labyrinthine resistive path mathematically optimized to ensure a perfectly circular heat field:
- Serpentine Path Design: Increases resistance and surface area for rapid and precise temperature ramping.
- Integrated Mounting Arms: Precision-bored holes for secure electrical connection, ensuring low contact resistance.
- Thermal Symmetry: Designed to match the geometry of the susceptor, minimizing radial temperature gradients.
3. Advanced Protective Coatings
Semicorex offers advanced coating enhancements to protect against aggressive chemical environments:
- CVD SiC Coating: A hermetic seal that prevents "carbon dusting" and oxidation in MOCVD environments.
- CVD TaC Coating: For SiC crystal growth exceeding 2,000°C, providing unparalleled resistance to hydrogen erosion.
Technical Performance Specifications
| Property | Typical Value | Industrial Benefit |
|---|---|---|
| Max Operating Temp | Up to 2,200°C | Supports all SiC/GaN growth profiles |
| Ash Content | < 2 - 5 ppm | Prevents dopant-level contamination |
| Density | 1.82 - 1.88 g/cm³ | High mechanical and thermal stability |
| Flexural Strength | 50 - 70 MPa | Resistance to mechanical stress and vibration |
| Thermal Conductivity | 100 - 130 W/m·K | Efficient and rapid heat transfer |
Critical Applications in Semiconductor Fab
- SiC Ingot Growth (PVT): Providing the precise vertical temperature gradient required to drive sublimation.
- MOCVD & PECVD: Serving as the primary heat source for susceptors in III-V compound semiconductors.
- High-Temperature Annealing: Clean, reliable heat for the activation of dopants in high-voltage power devices.
Every Graphite Heater undergoes 100% CMM dimensional verification to ensure a perfect fit into your specific reactor model. We provide full traceability and material certification, ensuring compliance with the strictest industry standards. By optimizing the resistive path, we help fabs reduce cycle times and increase the number of "Prime Grade" wafers per batch.
