11-095 A Novel 4H-SiC IGBT Structure with Improved Trade-off between Short Circuit Capability and On-state Voltage Drop

December 21, 2016

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A novel IGBT structure with a built-in lateral JFET region is proposed to reduce the saturation current.  A low saturation current level for high voltage IGBT’s is desirable for strong short circuit capability.  The saturation current can be reduced by increasing the cell pitch of the conventional IGBT structure at the sacrifice of increased on-state voltage drop.  The proposed structure provides a greatly improved trade-off between saturation current and forward voltage drop.  Furthermore, reduced saturation current in the IGBT limits the reverse recovery current of the freewheeling diode without substantial increase of the turn-on energy loss at reduced di/dt and prevents the snapponess of the diode during reverse recovery.  The new structure can also be applied to devices in other materials and other voltage ratings.

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