Diamond Semiconductor Plant Completed in Northeastern Japan - nippon.com

On May 29, 2026, Japan's northeastern Fukushima Prefecture completed the world's first diamond semiconductor factory in Okuma Town, marking a significant breakthrough in the semiconductor industry's a... Read original →

Japan’s inauguration of the world’s first diamond semiconductor plant in Ōkuma is far more than a materials breakthrough—it’s a strategic pivot. Technologically, high-purity synthetic diamond devices will pressure SiC and GaN competitors to accelerate radiation-hardened electronics for nuclear robotics and deep-space systems. Regulatory-wise, proximity to Fukushima Daiichi forces unprecedented radiation-safety certification protocols, raising global entry barriers for foreign suppliers. In market dynamics, while U.S. firm Wolfspeed and Taiwan, China’s Semicore Materials dominate wide-bandgap semiconductors, neither has scaled diamond production; Tokyo’s move may catalyze a U.S.-Japan-EU ‘radiation-hardened chip alliance’ to lock out Chinese rivals via standards. Though full output isn’t expected until FY2028, the plant has already triggered pre-emptive R&D surges in aerospace and defense sectors over the next 12–24 months—turning post-disaster recovery into a springboard for Japan’s reassertion in advanced semiconductor materials.