Power semiconductors
Which is a known cause of degradation when current flows continuously through the body diode of a SiC MOSFET?
- ABasal plane dislocations in the crystal expand into stacking faults
- BThe gate electrode melts
- CThe package emits light
Show answer and explanation
Answer: A. Basal plane dislocations in the crystal expand into stacking faults
When forward current flows through a SiC body diode, the energy from electron-hole recombination can expand basal plane dislocations in the crystal into stacking faults, raising the on-state voltage (bipolar degradation). Countermeasures include improved epitaxial layers and circuit designs that avoid conducting current through the body diode.