Used Equipment for GaAs, InP, and GaN Fabs: A Different Game

This guide is for: The compound semiconductor fab manager or startup founder sourcing used equipment for III-V processing who's discovering that the silicon equipment playbook doesn't apply.

I helped a GaN startup in North Carolina source their first MOCVD reactor in 2020. They assumed used III-V equipment would be priced like used silicon equipment — 20-30% of new. I showed them the market: used Aixtron 2600G3 reactors were trading at 50-70% of new cost because there are maybe 8-12 available globally at any time. Supply is that thin. They ended up paying $780K for a tool that would have cost $1.1M new. A 30% discount, not the 70% discount they'd budgeted for.

The III-V used equipment market operates by different rules than silicon. Smaller installed base, fewer tools on the secondary market, specialized safety requirements, and a dealer network you can count on two hands. Understand these differences or overpay and under-prepare.

Why the III-V Market Is Fundamentally Different

Silicon fabs operate hundreds of tools. When a 300mm logic fab upgrades, 50-100 tools hit the used market at once. That volume creates competition among dealers and pushes prices down.

Compound semiconductor fabs operate 5-20 tools total. When one comes available, it's a single-unit event. No volume discount, no competitive pressure between dealers. The seller knows that the buyer's alternative is a 12-18 month wait for a new tool from Aixtron or Veeco.

The installed base for MOCVD reactors globally is measured in hundreds, not thousands. Compare that to AMAT Centura platforms, where the installed base is measured in tens of thousands. Fewer tools means fewer used tools, means higher prices relative to new.

MOCVD: Aixtron vs Veeco

This is the centerpiece decision for any III-V fab. MOCVD (metalorganic chemical vapor deposition) grows the epitaxial layers that define your device.

Aixtron 2600G3: The workhorse for GaAs and GaN-on-sapphire. Planetary reactor design with rotation for uniformity. Used pricing: $500K-$900K for a standard configuration. Multi-wafer capacity (up to 8×6" or 55×2"). Susceptor replacement costs $15K-$30K and needs replacement every 500-1,000 runs depending on process chemistry.

Veeco Propel/TurboDisc: Dominant in GaN-on-SiC for RF and power applications. Used pricing: $400K-$1.2M depending on model and configuration. The K465i and Propel platforms command the highest prices. Veeco's close-coupled showerhead design gives excellent uniformity for GaN, but the showerhead is a $20K-$40K consumable.

Veeco Gen200 MBE: For InP and specialized epitaxy. MBE (molecular beam epitaxy) is slower than MOCVD but produces the highest-quality interfaces for advanced optoelectronic devices. Used Gen200 systems trade at $300K-$700K. Effusion cell replacement runs $8K-$15K per cell, and a typical system has 6-10 cells.

Don't cross-pollinate without understanding the implications. An Aixtron configured for GaAs can run GaN, but the susceptor, gas delivery, and exhaust systems may need modification. Budget $30K-$80K for reconfiguration.

Arsine and Phosphine: The Cost Nobody Warns You About

Every III-V MOCVD or MBE installation requires handling arsine (AsH3) and/or phosphine (PH3). These are among the most toxic gases used in semiconductor manufacturing. The infrastructure required to handle them safely adds $50K-$200K to your installation cost.

This includes: a toxic gas monitoring system (TGM) with multiple detection points, double-contained gas lines from the gas cabinet to the reactor, a dedicated exhaust scrubber rated for arsine/phosphine, an emergency ventilation system, and gas cabinet with automatic shutoff and purge capability.

If your facility already handles arsine and phosphine, adding another reactor is a modest incremental cost — $20K-$50K for gas line extensions. If you're starting from scratch, the gas infrastructure alone can exceed the cost of the used tool.

Building permits and safety certifications for arsine/phosphine handling take 3-6 months. Start this process before you purchase the reactor, not after.

What Transfers from Silicon Fabs

Some equipment crosses over from silicon to III-V without modification. Dry etch tools (Lam, AMAT, Oxford Instruments) work for III-V etch with recipe changes — but the etch chemistry differs (BCl3/Cl2 for GaAs vs CF4/O2 for silicon). Verify that the MFC ranges and gas delivery support your III-V chemistries.

PVD/sputter tools for metal deposition work across both. AMAT Endura, CHA, Denton — these all deposit Ti, Pt, Au, and other contact metals used in III-V devices. Pricing and availability follow silicon market norms.

Wet processing equipment (resist coat, develop, clean) transfers directly. An SVG or TEL track that runs silicon wafers will run GaAs wafers with recipe adjustments.

What doesn't transfer: furnaces designed for silicon oxidation (III-V compounds decompose at silicon oxidation temperatures), CMP equipment (III-V materials have different polish rates and chemistry requirements), and ion implantation (different species, different activation anneals).

GaN-on-SiC vs GaN-on-Si Equipment Implications

This distinction matters for equipment selection. GaN-on-SiC is the standard for RF and high-power devices — the substrate is silicon carbide, which requires higher growth temperatures and specific MOCVD reactor configurations. Veeco dominates this segment.

GaN-on-Si is growing for power electronics and LED, using standard silicon substrates. This opens the door to processing on standard silicon equipment for many back-end steps — a significant cost advantage. Aixtron has strong offerings here.

The reactor choice follows the substrate choice. Don't buy a reactor optimized for GaN-on-SiC if your roadmap is GaN-on-Si. The thermal profiles and gas delivery requirements differ enough to matter.

The Thin Dealer Network

The number of dealers who regularly handle III-V equipment is small — maybe 10-15 globally who specialize. Most silicon equipment dealers don't touch III-V because the volumes are low, the safety requirements are complex, and the buyer pool is tiny.

This means fewer options when sourcing and less price competition. It also means the dealers who do specialize know the equipment well and can provide genuine technical guidance. Build relationships with 2-3 III-V specialists rather than casting a wide net to dealers who don't understand the technology.

What to Do Right Now

Define your epitaxy platform requirement (MOCVD vs MBE) and substrate (GaAs, InP, GaN-on-SiC, GaN-on-Si). Assess your facility for arsine/phosphine capability — this determines your timeline more than the tool purchase. Contact 2-3 III-V equipment specialists for availability and pricing. And budget realistically: tool cost plus $50K-$200K for toxic gas infrastructure plus $30K-$80K for installation.

FAQ

How much does a used MOCVD reactor cost? $400K-$1.2M depending on manufacturer, configuration, and model. Aixtron 2600G3: $500K-$900K. Veeco Propel: $600K-$1.2M. Prices are 50-70% of new, not the 20-30% common in silicon equipment.

Why is used III-V equipment more expensive relative to new than silicon equipment? Smaller installed base means fewer tools on the secondary market. When only 8-12 systems are available globally, prices stay high.

What does arsine/phosphine gas handling infrastructure cost? $50K-$200K for a new installation including gas cabinets, toxic gas monitoring, double-contained lines, scrubbers, and emergency systems. Permitting adds 3-6 months.

Can I use silicon fab equipment for III-V processing? Some tools transfer: etch (with chemistry changes), PVD/sputter, wet processing. Furnaces, CMP, and implant tools generally don't transfer due to material incompatibility.

What's the difference between MOCVD and MBE for compound semiconductors? MOCVD is faster and more production-oriented. MBE produces higher-quality interfaces for advanced optoelectronic devices but is slower. Choose based on your device requirements and volume.