This letter describes an extensive analysis of the time-and field-dependent trapping processes that occur in GaN-based gate injection transistors exposed to high drain voltage levels. Results indicate thateven if the devices do not suffer from current collapsecontinuous exposure to high drain voltages can induce a remarkable increase in the on-resistance (R on). The increase in R on can be recovered by leaving the device in rest conditions: Temperature-dependent analysis indicates that the activation energy of the detrapping process is equal to 0.47 eV. By time-resolved electroluminescence characterization, we show that this effect is related to the capture of electrons in the gate-drain access region. Finally, we show that charge emission can be significantly accelerated through the injection of holes from the gate.
- Current collapse
- gallium nitride