High-purity isostatic graphite rau semiconductors

Semixlab High purity Isostatic graphite, due to its high purity, fine grain structure, uniform density, thermal shock resistance, and excellent machinability, is widely used in the semiconductor industry. Below are the major finished products and their corresponding roles in critical processes:

Isostatic Graphite for Semiconductor Applications

1. In MOCVD (Metal-Organic Chemical Vapor Deposition)

MOCVD is a core process for fabricating epitaxial layers of GaN, GaAs, and SiC. Isostatic graphite is commonly used to manufacture:

● Susceptors: Serve as wafer carriers that hold and rotate wafers inside the reactor. They provide uniform heat transfer, ensuring consistent epitaxial growth across the wafer surface. Typically coated with CVD SiC or TaC to improve chemical resistance and extend lifetime.

● Wafer Carriers / Graphite Boats: Used to load multiple wafers simultaneously. They require precise machining to maintain wafer flatness and avoid contamination.

● Heater Elements: Graphite heaters provide stable and uniform thermal fields essential for high-quality epitaxy.

Key role: Isostatic graphite ensures temperature uniformity, chemical stability, and long service life, which directly impacts epitaxial film quality.

2. In Annealing & Diffusion Furnaces

High-temperature thermal processing steps, such as dopant diffusion, oxidation, and annealing, rely heavily on isostatic graphite components, including:

● Diffusion Furnace Boats: Hold wafers during high-temperature annealing and dopant diffusion processes. Graphite provides excellent thermal stability and minimal deformation under repeated thermal cycling.

● Liners and Insulation Components: Graphite liners and shields protect furnace chambers from contamination and enhance temperature uniformity.

● Heater Tubes & Elements: Used as resistance heaters in high-temperature environments, delivering precise and consistent heat.

Key role: Isostatic graphite components enable contamination-free, stable, and repeatable heat treatment, crucial for dopant activation and defect reduction.

3. In SiC Epitaxy (4H-SiC, 6H-SiC growth)

SiC epitaxial growth demands ultra-high temperatures (>1500°C) and corrosive gas environments. Isostatic graphite is used to fabricate:

● SiC-coated Susceptors: Provide the substrate support during SiC epitaxy, ensuring excellent heat distribution and surface stability under extreme conditions.

● Graphite Paddles & Wafer Holders: Secure wafers during rotation and gas flow, ensuring uniform growth rate and layer thickness.

● Process Tube Components: Structural graphite parts inside epitaxy reactors withstand aggressive environments while maintaining purity.

Key role: Isostatic graphite in SiC epitaxy provides dimensional precision, chemical resistance, and reliable thermal management, which directly influence wafer yield and epitaxial film uniformity.

As a leading supplier of high-purity isostatic graphite in China, Semixlab is committed to providing advanced products and technical solutions for the semiconductor processing industry. We welcome your inquiries at any time and sincerely hope to become your long-term partner.