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CVD SiC Coated Graphite Susceptor for MOCVD
As a critical consumable component in Metal-Organic Chemical Vapor Deposition (MOCVD) epitaxy, the CVD SiC Coated Graphite Susceptor for MOCVD Epitaxy is engineered to meet the stringent thermal, chemical, and mechanical demands of advanced compound semiconductor growth processes. Designed with a high-purity graphite core and a chemically vapor-deposited silicon carbide (CVD SiC) coating, this susceptor delivers exceptional thermal uniformity, excellent resistance to corrosive process gases, and long service life under repeated high-temperature cycling typically encountered in III-V and II-VI epitaxial production. We welcome your inquiry.
Description
In today’s compound-semiconductor industry, MOCVD tools are pushed harder than ever. Higher power densities, tighter device geometries, and ever-stricter yield targets mean that every consumable part must perform predictably, cycle after cycle. Among these, the graphite susceptor often gets overlooked – but it’s arguably the one component that most directly shapes wafer-temperature uniformity, layer-quality consistency, and overall production efficiency.
That’s where Semixlab’s coated susceptor comes in. We start with high-purity isostatic graphite, then apply a dense silicon carbide layer through chemical vapour deposition. The result is a part that stands up to aggressive epi chemistries, delivers reliable heat transfer, and sheds virtually no particles – even after hundreds of runs. It’s a proven choice for growing GaN, SiC, AlN, AlGaN, and other III-V materials, whether you’re making power devices, LEDs, or RF components.
Why the Susceptor Matters More Than You Might Think
In practice, the susceptor isn’t just a wafer holder. It influences gasflow dynamics, thermal gradients across the pocket, and the risk of crosscontamination between batches. A welldesigned SiC coating does three things at once: it seals the graphite surface, prevents outgassing, and resists attack from ammonia, hydrogen, and halide precursors. That translates into fewer idle cleanings, better repeatability from run to run, and – ultimately – more good dies per wafer.
Key Properties We’ve Built Into the Coating
● A thermal field that stays uniform across the entire pocket area, so you don’t get hot spots or cold edges.
● A CVD SiC layer that’s fully dense, with porosity near zero – which is what keeps particle counts low.
● Chemical resistance that holds up against the harshest MOCVD recipes, including those with hightemperature NH₃ and H₂.
● Mechanical stability that survives rapid heating and cooling without cracking or delaminating.
● Machining tolerances down to a few microns, with full OEM support for custom pocket designs, hole patterns, and diameters.
Where Our Susceptors Are Typically Used
● GaNbased LED epitaxy (both conventional and microLED)
● GaN powerdevice structures (e.g. HEMTs)
● SiC homoepitaxy and heteroepitaxy for power and RF
● AlN growth for deepUV and piezoelectric layers
● Other IIIV combinations – InGaN, AlGaN, and more
At a Glance: What You Get
Feature | What It Means for You |
Substrate | Isostatic graphite, ash content < 5 ppm |
Coating | CVD silicon carbide, fully crystalline |
Thermal performance | Stable up to 1400°C in H₂/NH₃ environments |
Corrosion resistance | Passes 100hour NH₃ soak tests without weight change |
Lifetime | Typically 3–5× longer than uncoated or painted alternatives |
Custom options | Diameter, pocket count, edge geometry, hole locations – all per your drawing |
Why Our Customers Come Back
We’re not just a coating house – we’re a partner who understands epitaxy from the inside out. Our team has worked on both the reactor and the process side, so we know what matters: consistent thermal contact, minimised drift, and fast turnarounds when you need prototype iterations. Whether you’re ordering five pieces for a pilot line or five hundred for highvolume production, we apply the same inspection rigour and the same willingness to adapt.
Frequently Asked Questions – Straight Answers
Q1: What does “CVD SiCcoated graphite susceptor” actually mean?
A: It’s a graphite disc that’s been given a thin, impervious layer of silicon carbide using a chemical vapour deposition process. The coating seals the porous graphite, so it doesn’t release particles or react with process gases inside the MOCVD chamber.
Q2: Why bother with SiC instead of just bare graphite or a pyrolytic coating?
A: SiC offers a rare combination – it’s hard, chemically inert, thermally conductive, and has a coefficient of thermal expansion close to that of graphite. That means the coating stays intact through temperature cycles, unlike some other materials that flake or crack.
Q3: What epitaxial materials can you run on these susceptors?
A: We’ve seen them used successfully for GaN, SiC, AlN, AlGaN, InGaN, and even some ternary and quaternary alloys. The coating is essentially transparent to the chemistry, so it doesn’t interfere with doping or composition.
Q4: Can you make nonstandard sizes or multipocket designs?
A: Absolutely. We routinely machine custom pockets – different diameters, depths, and spacing – based on your wafer sizes and reactor layout. Just send us a drawing in DXF or STEP format.
Q5: How exactly does this boost productivity?
A: Three ways – fewer particles mean higher yields per run; longer coating life means fewer replacements and less downtime; and stable thermal behaviour means you can reuse the same process recipe for months without reoptimisation. That adds up to a tangible costperwafer improvement.
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