Diamond Foundry showed a 200-millimeter single-crystal diamond in China, a larger format intended for chip cooling whose commercial semiconductor performance has not been reported by the company.
CarbonSemi 2026 took place in Ningbo on Nov. 5-6. The exhibit remained an unpolished crystal rather than a fabricated wafer.
In November 2023, Diamond Foundry announced a 100-millimeter single-crystal wafer; the new D200mm specimen is double that diameter. D200mm is a single unbroken crystal; polycrystalline diamond instead consists of numerous small crystals.
At roughly 2,000 watts per meter-kelvin, diamond transfers heat at around five times copper's rate. Diamond Foundry is looking to cool powerful processors and use the material in compact power electronics. The format might suit current chip production lines, but the company has not published commercial-processing results, yield figures or defect-density measurements.
Separately, Diamond Foundry is developing a $2.77 billion Spanish factory linked to the EU Chips Act.
