0.97 mΩcm2/820 V 4H-SiC Super Junction V-Groove Trench MOSFET

We have fabricated Super Junction (SJ) V-groove trench MOSFETs (VMOSFETs), demonstrated a low specific on-resistance (RonA) of 0.97 mΩcm2 and a blocking voltage (VB) of 820 V. In the first trial, SJ structure in 4H-SiC have proved to be a good combination with MOS interface on (0-33-8) faces which keep high channel mobility in high doping concentration. We designed a protection structure called “upper p-pillar region” and demonstrated that VB lowering appeared according to its width.