Low Switching Loss Split-Gate 4H-SiC MOSFET With Integrated Heterojunction Diode

A 4H-SiC MOSFET with p-type region injection and integrated split gate and heterojunction diode is proposed in this paper. Compared with the conventional MOSFET, the proposed structure has a lower on-resistance and switching loss. And the gate oxide layer has been well protected by the p-type region, which reduces the electric field in gate oxide layer at the off-state. The on-resistance of device can be greatly reduced by increasing the doping concentration of current spreading layer and will not cause a huge electric field in gate oxide layer. The specific on-resistance is decreased by about 27.8% and the static characteristic (BV
²
/
$\text{R}_{\mathrm{ on,sp}}$
) of the device is improved about 37.3%. SiC material has a high third quadrant turn-on voltage due to its wide band gap characteristics. The use of heterojunction integration can take place of parasitic body diode and reduce its turn-on voltage, avoid the bipolar degradation effect, and improves the reverse recovery characteristics. To evaluate the dynamic performance, the reverse transmission capacitance (
$\text{C}_{\mathrm{ rss}}$
) and gate-drain charge (
$\text{Q}_{\mathrm{ gd}}$
) of the proposed structure have been studied in this paper via numerical simulations. Based on the simulation, the HF-FOM (
$\text{C}_{\mathrm{ rss}} {\times }\text{R}_{\mathrm{ on,sp}}$
) and HF-FOM
²
(
$\text{Q}_{\mathrm{ gd}} {\times }\text{R}_{\mathrm{ on,sp}}$
) of the proposed structure are decreased by about 87% and 86%, respectively. Meanwhile, the reverse turn-on voltage and reverse recovery characteristics are also improved, and the total energy loss decreases by about 37.3%.