# Diamond Foundry grows first 200 mm single-crystal diamond, prototype unveiled

- Published: 2026-11-07 15:15 UTC
- Section: Machines & Making › Electronics
- Tags: single crystal diamond, Diamond Foundry 200 mm, diamond semiconductor, thermal management, chip cooling
- URL: https://realtech.media/news/rt-82e392782238da84a3ec1b34_diamond_foundry_grows/

**Diamond Foundry has grown a continuous 200 mm single-crystal diamond, doubling its previous substrate dimensions.**

![Diamond Foundry grows first 200 mm single-crystal diamond, prototype unveiled](https://realtech.media/media/2026/11/3e0673a460bcf86e.webp)
*Interesting Engineering*

Diamond Foundry announced on November 6 that it has grown a 200-millimeter (7.9-inch) single-crystal diamond in San Francisco, doubling the diameter of its previous 100 mm (3.9 inches) crystal [1]. According to the company, as reported by Interesting Engineering, the demonstrated prototype represents a single continuous structure rather than a polycrystalline disk. The sample is currently in an unpolished, as-grown state, and its production yield, manufacturing cost, and suitability for commercial chip fabrication remain undisclosed.

## Thermal and electrical characteristics

High-purity single-crystal diamond exhibits a thermal conductivity of roughly 2,000 watts per meter-kelvin (W/m·K) at room temperature [1]. This performance exceeds the thermal conductivity of copper and could provide passive cooling solutions for high-performance computing devices and advanced packaging. Furthermore, the material has a wide bandgap of approximately 5.47 electron volts, making it relevant for high-power and high-frequency electronics [1]. However, utilizing diamond as a semiconductor requires addressing integration challenges and doping difficulties to control electrical properties reliably.

## Manufacturing steps and scaling

Producing the 200 mm crystal follows 25 years of research by engineers Stefan Gsell and Martin Fischer, according to CEO Martin Roscheisen [1]. The previous 100 mm crystal was grown using diamond heteroepitaxy, although the specific deposition parameters for the 200 mm substrate have not been disclosed. Turning the grown crystal into a commercial semiconductor wafer will require verifying surface flatness, uniform thickness, low defect density, and multi-run repeatability. Diamond Foundry stated that the result makes a future 300 mm (11.8 inches) crystal predictable, alongside plans for a $2.77 billion project in Spain [1].

## Sources

1. [Interesting Engineering](https://interestingengineering.com/innovation/diamond-foundry-grows-200mm-diamond-chips)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-82e392782238da84a3ec1b34_diamond_foundry_grows/