Power Diamond Systems Achieves Breakthrough in Diamond MOSFET Technology for Power Electronics

Breakthrough in Diamond MOSFET Technology

Power Diamond Systems, Inc., headquartered in Tokyo, Japan, has made a remarkable advancement in the realm of diamond semiconductor technology. The company has achieved a groundbreaking milestone by successfully demonstrating the world’s first switching operation of a diamond MOSFET at 200V and 1A. This accomplishment underscores the potential of diamond-based devices and sets a new standard in the industry.

The Significance of Diamond Semiconductors

Diamond semiconductors are renowned for their exceptional material properties. They exhibit a wide bandgap, possess an extremely high dielectric breakdown field, and demonstrate impressive thermal conductivity. These characteristics position diamond as a superior candidate for next-generation power devices that could potentially eclipse traditional semiconductors, including silicon (Si), silicon carbide (SiC), and gallium nitride (GaN).

However, harnessing diamond's potential for practical applications has posed significant challenges. Achieving a combination of high breakdown voltage and low on-resistance has been particularly elusive. The concentration of the electric field at the gate edge has traditionally limited the drain-source breakdown voltage, while large current capabilities and optimal switching characteristics typically required the parallel connection of multiple smaller devices, complicating designs.

Innovative Research and Results

In its recent study, Power Diamond Systems has successfully tackled these challenges by enhancing its diamond MOSFET platform. The use of a field-plate structure mitigated the concentration of electric fields at the gate edge, thereby enhancing the breakdown voltage. Simultaneously, the device area was increased, enabling high-current operation without the need for numerous small devices connected in parallel, a constraint seen in prior models.

As a result, a single diamond MOSFET device achieved a notable breakdown voltage of 550V and a drain current of 0.8A. These outcomes validate the effectiveness of the company’s innovative device design and manufacturing techniques, particularly the field-plate structure.

Additionally, using the same device, the team was able to illustrate a 200V/1A switching operation, marking a significant achievement in diamond MOSFET research. This performance advancement signals a transition from merely evaluating static characteristics to practical verification of switching operations in diamond power devices.

Power Diamond Systems has also accomplished the establishment of a reliable fabrication process, enabling reproducible production of their devices. This reliability is crucial to ensuring a steady progression towards practical implementations of diamond semiconductor technology.

Future Directions

Looking ahead, Power Diamond Systems is poised to enhance its research and application development initiatives. The company aims to bolster collaborations with research institutions and industry partners, both domestically and internationally, to accelerate the societal adoption of diamond semiconductor devices. This commitment is essential for addressing the energy economy’s demand for next-generation power electronics, especially in emerging sectors such as mobility and renewable energy.

In summary, the advancements made by Power Diamond Systems in diamond MOSFET technology are not only groundbreaking but also indicative of the future possibilities that diamond semiconductor devices hold for the energy sector. As the technology matures and becomes increasingly integrated into various applications, the potential for enhanced energy efficiency and miniaturization in power modules becomes ever more tangible.

This research was accepted for publication in the journal Applied Physics Express on February 24, 2026, and has been made available online for wider dissemination.

About Power Diamond Systems, Inc.

Power Diamond Systems, located at Waseda University Entrepreneurship Center, is a pioneering startup focused on the research and development of diamond semiconductor devices. The company's mission is to lead the evolution of power electronics by leveraging the unique attributes of diamond materials to create ultra-compact, high-efficiency inverter modules, significantly contributing to energy savings and sustainability in society.