The direct bonding of a multi-cell GaN-HEMT to a single-crystal diamond substrate is believed to be the world’s first. The new GaN-on-Diamond HEMT will improve the power-added efficiency of high-power amplifiers in mobile communication base stations and satellite communications systems, thereby helping to reduce power consumption. Mitsubishi Electric will refine the GaN-on-Diamond HEMT prior to its commercial launch targeted for 2025.

This research achievement was first announced at the International Conference on Solid State Devices and Materials (SSDM) currently being held at Nagoya University, Japan from September 2 to 5.

Mitsubishi Electric handled the design, manufacture, evaluation and analysis of the GaN-on-Diamond HEMT and AIST developed the direct bonding technology. A part of this achievement is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).