Pyrolytic Graphite Crucible

The Semixlab Pyrolytic Graphite (PG) Crucible for SiC Single Crystal Growth is a precision-engineered core component designed specifically for Physical Vapor Transport (PVT) growth of 4H- and 6H-SiC boules used in next-generation power electronics. Produced using chemical vapor deposition techniques, pyrolytic graphite offers ultra-high purity, superior thermal uniformity, and exceptional structural integrity at temperatures exceeding 2200°C. These characteristics make PG the material of choice for high-performance SiC sublimation furnaces, where crystalline perfection, temperature stability, and contamination control directly determine wafer yield and electrical performance.

Within the SiC PVT process, the pyrolytic graphite crucible forms the central sublimation chamber that contains the SiC source powder and defines the critical temperature gradients required for controlled crystal growth. The anisotropic thermal conductivity of PG—higher in-plane and lower through-thickness—enables precise shaping of the thermal field, supporting the development of optimized axial and radial temperature profiles that minimize defect formation such as BPDs, TSDs, micropipes, and stacking faults. Its extremely low porosity and nearly zero particle shedding significantly reduce unintentional doping and contamination, ensuring stable n-type and semi-insulating SiC crystal production across long growth cycles that often extend for several days.

The inherent chemical inertness of pyrolytic graphite plays a vital role in maintaining a clean sublimation environment throughout the entire PVT cycle. Unlike conventional graphite, PG does not release embedded gases or residual impurities during extended exposure to ultra-high temperatures and vacuum conditions. This stability helps suppress impurity incorporation such as oxygen, nitrogen, and metallic contaminants, thereby supporting the fabrication of high-resistivity materials for RF devices as well as high-mobility SiC substrates for power MOSFETs, Schottky diodes, and high-voltage modules.

Semixlab’s manufacturing process ensures each PG crucible offers consistent density, homogeneous CVD-deposited layering, and precise dimensional tolerances essential for reproducible thermal modeling and long-term furnace reliability. Advanced machining and purification processes deliver smooth internal surfaces, reduced particle generation, and consistently low electrical and thermal variability from batch to batch. This reliability is crucial for maintaining stable growth rates, predictable temperature gradients, and reduced furnace downtime in high-volume SiC crystal production lines.

As the semiconductor industry accelerates its development towards large-diameter SiC ingots, the demand for them continues to grow.. Semixlab Pyrolytic Graphite Crucible for SiC Single Crystal Growth provides a high-performance, contamination-controlled foundation for PVT systems targeting 150 mm and 200 mm SiC wafer manufacturing. By combining ultra-high-temperature capability, engineered thermal anisotropy, and exceptional purity, Semixlab enables wafer manufacturers to achieve higher crystal quality, longer furnace lifetimes, and greater process repeatability—supporting the global expansion of EV, renewable energy, and industrial power conversion technologies.