1000-V 9.1-mΩ · cm² Normally Off 4H-SiC Lateral RESURF JFET for Power Integrated Circuit Applications

A 4H-SiC normally off vertical channel lateral reduced-surface electric-field (RESURF) junction field-effect transistor (JFET) with a blocking voltage Vbrof 1028 V and a specific on-resistance Ron-spof 9.1 mOmegamiddotcm2has been experimentally demonstrated. The device has a Vbr2/Ron-spfigure-of-merit of 116 MW/cm2, which is the highest value achieved to date on a 4H-SiC lateral power transistor. Also reported is a larger JFET that is capable of handling over 0.5-A current on an active area of 4.01times10-3cm2. The fabricated double-RESURF devices have a vertical channel length of 1.8 mum, created by tilted aluminum (Al) implantation on the sidewalls of deep trenches, and a lateral drift-region length of 7.5 mum. In addition, low-voltage logic-inverter circuits based on the same lateral JFET process have been monolithically integrated on the same chip. Proper logic-inverter function has also been demonstrated