Engineered Diamonds Solve Extreme Power Densities in Data Centers

What happened

This is a technology overview article on engineered (synthetic) diamond for data center power electronics. The AFCOM State of the Data Center report indicates average rack density has reached 27 kW per rack, making thermal bottlenecks the main limiting factor, while operators migrate to 800 V DC bus architectures. Diamond's thermal conductivity is ~2,200-2,400 W/m·K (up to 3,300 W/m·K for isotopically enriched samples), with a 5.5 eV bandgap and theoretical breakdown field of about 5–10 MV/cm; laboratory Schottky diodes have reached close to 8 MV/cm. Coherent Corp. introduced next-generation bondable diamond thermal management solutions, allowing direct fusion, hybrid, or metallic bonding to silicon, silicon carbide, and gallium nitride, reducing interface thermal resistance by as much as 99 percent for die sizes up to 100 mm². In June 2026, Element Six (part of the De Beers Group) and Tokyo-based precision components maker Orbray announced a reproducible process for 3-inch wafer-scale single-crystal diamond, with 4-inch substrates in development; Element Six is also preparing 2-inch wafers for thermal-bonding volume production at its CVD facility in Gresham, Oregon. Diamond Foundry opened a commercial production facility in Trujillo, Spain, in 2025 and is slowly ramping up production. Japan's Ookuma Diamond Device has built what it calls the world's first diamond semiconductor factory in Ōkuma, Fukushima, and is planning to mass-produce diamond-based semiconductor and power devices for nuclear decommissioning. Power Diamond Systems gave the first public verification of packaged diamond semiconductor performance at SEMICON Japan 2025, showing diamond-based power MOSFETs, and hopes to bring the technology to market in the 2030s. Diamond Quanta reported electron mobility greater than 555 cm²/V·s in polycrystalline diamond. The article states that diamond's function today is best viewed as a thermal enabler placed over proven GaN and SiC switches, not a drop-in replacement device.

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Source and time

Source: Power Electronics News · 10/7/2026 · View original source