Journal
IEEE ELECTRON DEVICE LETTERS
Volume 33, Issue 3, Pages 375-377Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2011.2181815
Keywords
Current collapse; gallium nitride; trapping
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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 that-even if the devices do not suffer from current collapse-continuous 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.
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