Halfmoon for LPE Reaction Chamber

What Is a Halfmoon in an LPE Reaction Chamber?

In many LPE horizontal reactors, the Halfmoon is part of the internal chamber assembly. Different equipment manufacturers may use slightly different structures, but the function is generally similar. The component is usually separated into upper and lower sections：

• Upper Halfmoon: The upper part mainly works as a support structure inside the reactor. Since it stays close to the high-temperature process zone for long periods, the material needs to remain stable without obvious deformation after repeated thermal cycles.Another important point is chemical stability. During SiC epitaxy, the chamber environment contains reactive gases, so the graphite surface must be properly protected.
• Lower Halfmoon: The lower section is connected near the quartz tube area and the rotating assembly. It is involved in gas introduction and mechanical support during epitaxial growth. Compared with ordinary graphite structural parts, the lower Halfmoon usually faces higher requirements for oxidation resistance and thermal shock stability because of continuous heating and cooling during reactor operation.

Key Features of VETEK Halfmoon for LPE Reaction Chamber

1. High Purity Graphite Substrate

The base material is high-purity graphite suitable for semiconductor process environments. Material purity is important in SiC epitaxy because metallic contamination may affect crystal growth stability and film quality. VETEK uses purified graphite materials with controlled impurity levels for this application.

2. Advanced CVD SiC & TaC Coating

Most Halfmoon components are coated with CVD SiC to improve surface protection under high-temperature process conditions. For more demanding environments, TaC coating is also available. Typical advantages of coated structures include:

• better resistance to corrosive process gases
• lower particle generation
• improved surface durability
• better stability during thermal cycling

In practical use, coating selection usually depends on reactor temperature, process chemistry, and expected service lifetime.

3. Excellent Thermal Stability

Designed for high-temperature semiconductor processing environments, the VETEK Halfmoon maintains dimensional stability and structural integrity during prolonged epitaxial cycles, making it highly suitable for LPE and MOCVD equipment.

4. Precision CNC Machining

VETEK possesses advanced CNC precision machining capabilities with micron-level dimensional control, ensuring excellent compatibility with complex LPE reactor structures and customized equipment requirements.

5. Long Service Life

Through optimized coating adhesion technology and high-purity material processing, VETEK Halfmoon components demonstrate excellent durability under repeated thermal cycling and corrosive process gases, reducing maintenance frequency and total operating costs.

Technical Advantages

Applications

The VETEK Halfmoon for LPE Reaction Chamber is widely used in:

• Silicon Carbide (SiC) epitaxy systems
• LPE horizontal reactors
• Semiconductor epitaxial growth equipment
• High-temperature CVD process chambers
• Advanced semiconductor thermal field systems
• SiC crystal growth systems
• Third-generation semiconductor manufacturing

Our products are compatible with multiple industry mainstream equipment platforms and can be customized according to customer drawings or reactor specifications.

Why Choose VETEK Semiconductor?

VETEK Semiconductor has been focusing on semiconductor graphite components and coating technologies for many years. Since 2016, the company has continued developing its capabilities in purification processing, precision graphite machining, and CVD coating production for semiconductor applications.

VETEK Capabilities：

• Experience with SiC epitaxy components and reactor parts
• In-house CVD SiC and TaC coating production
• Semiconductor-level material purification control
• Custom manufacturing based on drawings or samples
• Stable production capacity for batch orders
• Supply of graphite felt and thermal field materials
• ISO9001 quality management system
• Technical support for overseas customers

FAQ

(1) What is the function of the Halfmoon in an LPE reactor?

The Halfmoon component supports gas flow guidance, chamber structure integration, temperature management, and susceptor rotation inside the epitaxial reaction chamber.

(2) Is the Halfmoon in direct contact with the wafer?

Normally no. In most LPE reactor structures, the Halfmoon stays around the chamber assembly rather than touching the wafer directly.

(3) Why use SiC or TaC coating on the surface?

The coating is mainly for protection. During SiC epitaxy, graphite parts are exposed to high temperature and reactive gases for long periods. Coating helps improve oxidation resistance and reduces surface wear and particle generation.

(4) Can the part be customized?

Yes. Most Halfmoon parts are actually made according to reactor structure and customer drawings, because dimensions and installation details often vary between equipment platforms.