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    "headline": "Diamond Foundry says it has grown the first 200 mm single-crystal diamond, as wide as a chip wafer",
    "description": "The eight-inch disc is still as-grown and unpolished, and the US company has published no yield or price figures, but it says a 300 mm crystal is now in view.",
    "datePublished": "2026-11-08T14:53:00+00:00",
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    "keywords": "AI chips, Diamond Foundry, semiconductors, synthetic diamond",
    "articleBody": "A single crystal of diamond 200 millimeters across now exists, according to Diamond Foundry, the US company that announced it on November 5. That is about eight inches of unbroken diamond lattice, wide enough to match a standard size of silicon wafer, and the company calls it a world first. The disc is not a finished product. Published accounts of the announcement describe the specimen as as-grown and unpolished, and they note the company gave no figures for yield, price or production volume. What it has shown is that the crystal can be grown at that diameter. Whether it can be polished into something a chip factory will accept is the next test. Why the width matters Diamond Foundry’s first wafer, announced in 2023, measured 100 millimeters. Doubling the diameter does much more than double the material. Area scales with the square of the diameter, so 200 mm squared over 100 mm squared gives four times the surface. The silicon industry shows what that buys. Standard wafer tables put about 56 chips of 100 square millimeters on a 100 mm wafer, and 269 on a 200 mm wafer. That is close to five times as many, because less of the round edge goes to waste. Size also decides who can use it. Factories are tooled around specific wafer diameters, and 200 mm is one of the formats they already handle. A diamond disc that fits existing equipment is a very different proposition from a small, oddly sized plate. A cooling job, not a jewelry one The company’s pitch is heat. On its own product page, Diamond Foundry charts thermal conductivity at 150 for silicon, 380 for copper and 3,000 for diamond. By those numbers diamond moves heat 20 times better than silicon and nearly eight times better than copper. AI processors concentrate enormous power into tiny hot spots, and Diamond Foundry’s plan is to bond a thin diamond layer directly to the chip so those spots spread out. The company claims gains of “up to 10x” in both power and lifetime for chips built this way. Those are its own marketing figures, and we found no outside test of them. Synthetic diamond has served as a heat spreader for lasers and power transistors for years. The obstacle has been size, since lab-grown crystals have historically come out small. Twenty-five years in the making Chief executive Martin Roscheisen has credited hundreds of engineers and technicians, and in particular two researchers, Stefan Gsell and Martin Fischer, who spent 25 years on growing high-quality single-crystal diamond at expandable sizes before their work joined the company’s. Diamond Foundry acquired Audiatec, a German firm with 25 years on the same problem, in 2022. The company built its first foundry in Wenatchee, Washington, running on hydropower. Its site makes a bolder claim alongside the new disc: that chip-sized single-crystal diamond is now “available in volume.” The announcement of the 200 mm specimen itself did not back that up with production data. What comes next Roscheisen has said this result makes a 300 mm crystal foreseeable, without giving a date. A 300 mm disc would carry 2.25 times the area of the new one, and it is the diameter the most advanced silicon factories run on today. Further reading Wikipedia: Synthetic diamond Wikipedia: Wafer (electronics) Image: Bilovitskiy, CC BY 4.0 via Wikimedia Commons This article was produced with AI assistance and reviewed by our Editorial Desk. How we work.",
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