Power Diamond Systems Achieves Breakthrough with World's First 200V / 1A Switching Operation for Diamond MOSFETs

Power Diamond Systems Achieves Milestone in Diamond MOSFET Technology

In a groundbreaking achievement, Power Diamond Systems, based in Tokyo, has successfully enhanced its diamond MOSFET technology to become the first in the world to demonstrate the capability of 200V and 1A switching operation. This remarkable advancement also includes achieving a breakdown voltage of 550V and a drain current of 0.8A within a single diamond device, thereby showcasing unparalleled performance standards. This success is a significant milestone toward the practical deployment of diamond semiconductors in power device applications.

The Importance of Diamond Semiconductors

Diamond semiconductors have garnered global attention due to their exceptional physical properties, including wide bandgap, high breakdown fields, and excellent thermal conductivity. These characteristics position diamond as a next-generation material, surpassing traditional semiconductors like silicon (Si), silicon carbide (SiC), and gallium nitride (GaN). The challenge has always been to achieve high breakdown voltage while simultaneously reducing on-resistance, which is crucial for effective power electronics applications. Particularly, high breakdown voltages are often limited by electric field concentration at the gate ends, presenting significant design challenges.

Innovating Solutions

Power Diamond Systems leveraged its foundational research in diamond MOSFETs to implement a field plate structure that mitigates electric field concentration at the gate, successfully achieving higher breakdown voltages. The company also focused on increasing the device's effective area, enabling higher current operation without relying on parallel connections of multiple small devices. Consequently, they realized compatibility of 550V breakdown voltage and up to 0.8A current through a single diamond MOSFET. This evidence reinforces the efficacy of Power Diamond Systems' design expertise and process technologies, including field plate techniques.

Moreover, for the first time in history, this diamond MOSFET was capable of 200V and 1A switching operation. This achievement marks a transition from static characteristic evaluation to practical operational verification of diamond power devices, indicating their readiness for practical application.

Advancements and Future Directions

Power Diamond Systems has established stable processes that allow for reproducible device fabrication, highlighting their commitment to technical reliability and steady progress towards practical applications. Looking ahead, the company is determined to further enhance its technology and application development through collaborative efforts with research institutions and businesses, both domestically and internationally.

This innovative research was recently published online in Applied Physics Express on February 24, 2026. A significant portion of this research received support from the New Energy and Industrial Technology Development Organization (NEDO) as well as Japan's Ministry of Education, Culture, Sports, Science and Technology under the Advanced Research Infrastructure for Materials Program.

About Power Diamond Systems

Power Diamond Systems is a start-up focused on the research and development of diamond semiconductor devices, aiming to contribute to energy-saving advancements in next-generation power electronics sectors such as mobility and renewable energy. With their innovative diamond semiconductor technology, they aspire to realize ultra-compact, highly efficient inverter modules that contribute to a smarter energy society.

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