200mm single-crystal diamond growth… AI semiconductor substrate development

Diamond Foundry said it has grown a 200mm single-crystal diamond, which it calls D200mm and describes as the first such wafer-scale single crystal, rather than a tile or polycrystalline assembly. The material is being developed as a substrate to spread heat in AI semiconductors, a role where diamond's thermal conductivity could ease thermal bottlenecks as chip power rises. CEO Martin Roscheisen called the milestone, which the company says follows 25 years of R&D, nearly impossible. The announcement did not disclose wafer pricing, production volumes or customer commitments. Next, watch for qualification by chipmakers, defect-density and yield data, and whether Diamond Foundry can scale single-crystal output toward commercial substrate supply.