600 V -Class V-Groove SiC MOSFETs

The authors applied a thick gate oxide layer at the trench bottoms to 600 V class truncated V-groove MOSFETs of which MOS channels were formed on 4H-SiC (0-33-8) facets and validated the static and switching characteristics. The specific on-resistance and the threshold voltage were 3.6 mΩ cm2 (VGS=18 V, VDS=1 V) and about 1 V (normally-off), respectively. The breakdown voltage of the MOSFET with a thick oxide layer was 1,125 V (IDS=1 μA). The switching losses during turn-on and turn-off operations were estimated to be 105.8 μJ and 82.5 μJ (300 V, 10 A) at room temperature. The switching characteristics exhibited low temperature dependence for turn-on/off time.