Diamond Foundry says it has grown a 200mm single-crystal diamond

A 200mm single-crystal diamond wafer is not a lab curiosity—it is the inflection point where diamond enters the semiconductor supply chain as a manufacturable substrate. Silicon's 4-inch-to-8-inch transition in the 1980s birthed the foundry model; diamond now sits at an analogous threshold. Technically, 200mm compatibility means existing lithography, etch, and deposition lines can process diamond with minimal retooling. The next competitive battleground is dislocation density below 1/cm² and crystallographic uniformity. First commercial traction will come from 600V+ power modules, data-center GPU heat spreaders, and terahertz RF front-ends. On competition, Element Six and IIa Materials hold deep CVD know-how, but 200mm yield ramp is the real moat. SiC (Wolfspeed) and GaN (Infineon, Navitas) still win on cost; diamond will initially carve a niche in ultra-pure substrates and extreme thermal management rather than displacing either. Within 18 months, expect two or three IDM players to announce production-grade diamond heat-sink integration. Simultaneously, the U.S. Commerce Department is likely to add large-diameter single-crystal diamond to export-control lists—the chokepoint logic that once applied to photoresist is now migrating to third-generation semiconductor materials. The supply-chain reconfiguration window is already open.