Abstract
GaN-based power devices have been expected to overcome the performance limit of conventional Si-based devices and enable highly efficient power switching systems. Technical issues have been mostly solved for the commercialization so far and the remaining tasks are to find more suitable applications and extract the full potential of the superior material properties. In this paper, we present state-of-the-art GaN-based power devices on cost-effective Si substrates and their applications to power switching systems. Novel Gate Injection Transistors (GITs) with normally-off operation enable highly efficient operations of isolated DC-DC converters in power supplies. The above results demonstrate very promising potentials of GaN based power switching transistors.
