© 2022 IEEE.The rapidly growing demand for power electronics to rout, control, and convert electrical power motivates recent research into devices based on ultra-wide-bandgaps semiconductors. Diamond-based semiconductor devices have drawn increasing attention in high-power applications due to diamond's extraordinary electrical and physical properties. It has a 5.5 eV band gap and over 7.7MV cm-1 breakdown field. Diamond is also one of the best thermal conductors with thermal conductivity over 2200 Wm-1k-1, making it an ideal material for high power applications where heat dissipation is challenging . To demonstrate diamond's advantages in power electronics, diamond power diodes and transistors are fabricated with breakdown voltages much higher than devices based on other wide band-gap materials.