Diamond Foundry says it has grown first 200 mm single-crystal diamond

What happened

According to Evertiq on November 10, 2026, US company Diamond Foundry says it has grown the first single-crystal diamond with a diameter of 200 mm, the same size as a standard semiconductor wafer, which the company sees as a step towards using diamond as a substrate material in chip manufacturing. According to the company's press release, the crystal is shown as grown and unpolished, directly from the growth process, and the company stresses that it is neither an assembly of smaller diamond pieces nor a polycrystalline wafer, but a single crystal diamond at D200mm scale. According to the company, the result builds on 25 years of work by Stefan Gsell and Martin Fischer, later carried forward by hundreds of engineers and scientists at Diamond Foundry; reaching 200 mm required breakthroughs across crystal growth, growth chemistry, plasma physics, reactor architecture, thermal management, metrology, process control and automation. Roscheisen said this makes D300mm predictable as well. The company says diamond combines the highest thermal conductivity of any material and, for AI processors that concentrate large amounts of power in small areas of silicon, could spread heat at the material level. However, Diamond Foundry does not give data on the crystal's thickness or quality, or say when diamond wafers of this size could be commercially available.

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Source and time

Source: Evertiq · 11/10/2026 · View original source