Diamond Foundry's 200 mm Diamond Wafer Targets AI Chip Overheating

Overheating has become one of the quieter bottlenecks in AI hardware. Chips keep drawing more power, and the cooling sitting on top of them is struggling to keep pace. US-based Diamond Foundry thinks part of the answer lies underneath the silicon. It has shown what it describes as the world's first 200 mm single-crystal diamond wafer, and it says production lines for finishing it will be built in Spain. The timing matters, since McKinsey projects that AI inference could account for up to 40% of data center demand by 2030.

Why diamond, and why single crystal matters

The company puts the material's thermal conductivity at least five times higher than copper. Copper sits near 400 W/m·K, while the single-crystal diamond is said to exceed 2,000 W/m·K. Thermal conductivity measures how quickly a material moves heat through itself. Diamond has a second advantage: it's an electrical insulator, so it can sit close to circuitry without raising the risk of short circuits.

The real target isn't the chip as a whole. It's the hotspots, tiny zones in the silicon where heat concentrates far more intensely than average die temperatures suggest. Even advanced systems such as the LiquidJet cooler designed for NVIDIA Rubin architectures can struggle when heat doesn't spread fast enough from inside the chip. Applying diamond directly to the processor package would, in theory, distribute that heat evenly before it reaches the conventional cooler. The company's pitch is higher clock speeds, less wasted energy and longer hardware life.

What separates this from earlier diamond efforts is structure. Other synthetic diamond solutions are polycrystalline, built from many smaller crystals that create internal boundaries heat must cross. Diamond Foundry's 200 mm piece is one continuous crystal, which removes those boundaries and makes large-format substrates possible. There's a caveat, though. The wafer on display is raw and unpolished, a technology demonstration rather than a product. Finishing and validation still lie ahead.

Spanish production and a 300 mm ambition

The manufacturing footprint runs through the Iberian Peninsula. In November 2025 the company announced an expansion plan valued at $2.77 billion, roughly €2.48 billion at the exchange rate cited in the source. The plan includes a €753 million stake from the Spanish state, channelled through the Sociedad Española para la Transformación Tecnológica.

The work is split across two regions. The Trujillo site in Extremadura will expand monocrystalline diamond growth capacity. Facilities in Saragossa handle slicing crystals into wafers, surface finishing and final preparation for the semiconductor industry. That split reflects how chip supply chains often work: growth is capital-heavy and slow, while the downstream steps determine whether material is actually usable by a fab.

The next goal is 300 mm single-crystal wafers before 2030, built on progress in reactor architecture, chemistry, plasma generation and crystal growth. The 300 mm format is the standard in the most advanced semiconductor fabs, so it would make direct adoption on current lithography lines far easier than 200 mm material. Diamond Foundry hasn't disclosed commercial timelines, yield rates or final costs, though. Those three numbers will decide whether this stays a lab milestone or becomes a real supply-chain option.

Who else is chasing diamond cooling

Diamond Foundry isn't alone. The source names De Beers, Frore Systems and Akash Systems as competitors in diamond-based cooling. Akash develops solutions that pair diamond with gallium nitride (GaN) and says it can lower chip operating temperatures by up to 20 °C. Those are company claims, and they'll need independent testing to carry weight with chipmakers.

What to watch

For most buyers, none of this reaches a laptop or gaming PC soon. The first customers are data center operators, where a few degrees of thermal headroom translates into performance and power decisions at scale. My read is that the question isn't whether diamond conducts heat better; the numbers already settle that. The question is whether yield, polishing cost and fab compatibility can bring a 300 mm wafer to the point where chipmakers design around it. Watch for yield figures and pricing. Those details will separate a striking demo from a supply chain.