High current capability of 3C-SiC vertical DMOSFETs
Vertical power DMOSFETs in 3C-SiC, ranging in size from a single-cell to 33mm2 containing 12,000 hexagonal cells, were developed for the first time. Both the drain and leakage currents scale linearly with device size up to a 11mm2 device containing 976 cells. An inversion channel mobility of 40cm2/Vs and interface state density of 51012 to 11013cm?2eV?1 were obtained. A fabricated DMOSFET with a gate length of 2?m had a low specific on-resistance of 5.6m?cm2 for a single-cell device. A current density of 1220A/cm2 for a single-cell device, and 380A/cm2 for a 102-cell device were demonstrated. A high current capability of 41 to 132A at 600V can be extrapolated for a 33mm2 chip.
3c-sic dmosfet channel mobility interface state density on-resistance