Diamond Foundry grows the first 200 mm single-crystal diamond, aiming at AI-chip heat
The company says the wafer-scale crystal is one piece, not tiled or polycrystalline, and that it makes 300 mm 'predictable'.
Why it matters
Diamond Foundry announced a 200 mm-diameter single-crystal diamond, shown as grown and unpolished, alongside a CarbonSemi 2026 keynote by CEO Martin Roscheisen. The company stresses it is a single crystal rather than an assembly of pieces or a polycrystalline wafer. Diamond's thermal conductivity could spread heat inside power-dense AI processors, and Diamond Foundry wants to turn it into a semiconductor substrate made at scale. Roscheisen credited Stefan Gsell and Martin Fischer's 25-year effort and said the result makes 300 mm predictable.
Key facts
- First 200 mm-diameter single-crystal diamond, shown as grown and unpolished
- A single crystal, not tiled pieces or a polycrystalline wafer
- Announced with a CEO keynote at CarbonSemi 2026 in Ningbo
- Targets heat spreading in power-dense AI processors
- Builds on 25 years of work by Stefan Gsell and Martin Fischer
- CEO Martin Roscheisen: it makes 300 mm predictable