LPE SiC EPI Halfmoon

The LPE SiC EPI Halfmoon is a precision-engineered component specifically designed for SiC epitaxial growth systems, particularly Liquid Phase Epitaxy (LPE) and hybrid CVD/LPE reactors used in high-temperature SiC deposition processes.

Its CVD TaC coated graphite structure ensures exceptional resistance to thermal and chemical degradation, while its halfmoon geometry plays a decisive role in stabilizing both thermal and gas flow fields within the reaction chamber.

Applications in SiC Epitaxy

Below is a detailed breakdown of its functional roles across multiple critical aspects of the SiC epitaxy process:

1. Thermal Field Uniformity and Control

Uniform thermal distribution is fundamental to achieving high-quality SiC epitaxial layers. In the LPE reactor environment, temperatures can exceed 1600–1800°C, with gradients that directly affect epitaxial layer thickness, doping concentration, and defect formation. The EPI Halfmoon serves as a thermal balancing component that:

● Reflects and redistributes radiant heat across the wafer zone, minimizing vertical and radial temperature gradients;

● Enhances thermal symmetry within the reactor, stabilizing the interface between the substrate and the molten silicon-carbon source;

● Prevents local overheating and ensures that the SiC crystal growth front progresses at a controlled rate.

2. Gas Flow Distribution and Reactive Environment Optimization

The halfmoon structure is specifically engineered to modulate gas flow velocity and direction within the reactor.

In SiC epitaxy, precursor gases such as SiH₄, C₃H₈, and H₂ must maintain laminar flow and uniform distribution to prevent localized reaction rates and particle formation. The EPI Halfmoon contributes to this by:

● Guiding gas circulation along optimized flow paths, preventing stagnation zones and ensuring homogeneous precursor delivery;

● Promoting uniform mass transport of Si and C species to the wafer surface, reducing micro-defects and step bunching;

● Enhancing exhaust gas evacuation to prevent secondary reactions or contamination buildup on chamber walls.

3. Chemical Protection and Surface Purity Control

During prolonged epitaxial growth cycles, unprotected graphite components are susceptible to chemical erosion, carbon diffusion, and gas-phase contamination. The CVD TaC coating on the Halfmoon provides:

● A chemically inert barrier against aggressive gases like H₂, SiH₄, and Cl₂-based etchants;

● Strong suppression of carbon vapor-phase contamination, ensuring that no unwanted carbon species diffuse into the epitaxial layer;

● Improved chamber cleanliness and extended maintenance intervals.

4. Compatibility and Integration

Semixlab’s LPE SiC EPI Halfmoon is fully customizable to integrate with:

● LPE vertical reactors, where it functions as an upper or side reflector for thermal balancing;

● Horizontal or hybrid CVD-LPE chambers, where it acts as a gas flow stabilizer or shielding insert;

● OEM systems from major epitaxy equipment manufacturers such as Aixtron,LPE,and Veeco.

Each Halfmoon is precision-machined to ensure dimensional accuracy within ±0.05 mm, guaranteeing seamless installation and minimal flow disturbance in high-vacuum or hydrogen-rich environments.

In SiC epitaxial growth, every degree of temperature deviation and every subtle gas flow imbalance can impact wafer quality and device yield. Semixlab LPE SiC EPI Halfmoon addresses these challenges with a scientifically optimized combination of graphite precision engineering and CVD TaC coating technology, offering unparalleled control over heat, gas, and purity -the three foundations of high-performance SiC epitaxy. Welcome to contact us for further technical consultation and customized design.