True Breakdown Voltage and Overvoltage Margin of GaN Power HEMTs in Hard Switching

Joseph P. Kozak, Ruizhe Zhang, Qihao Song, Jingcun Liu, Wataru Saito, Yuhao Zhang

    Research output: Contribution to journalArticlepeer-review

    53 Citations (Scopus)


    This work studies the dynamic breakdown voltage (BV) and overvoltage margin of a 650-V-rated commercial GaN power HEMT in hard switching. The dynamic BV measured in the hard switching circuits is over 1.4 kV, being 450 V higher than the static BV measured in the quasi-static I-V sweep. The device can survive at least 1 million hard-switching overvoltage pulses with 1.33 kV peak overvoltage (95% dynamic BV). Recoverable device parametric shifts are observed after the 1-million pulses, featuring small reductions in threshold voltage and on-resistance. These shifts are different from the ones after the hard-switching pulses without overvoltage and are attributable to the trapping of the holes produced in impact ionization. These results suggest that the BV and overvoltage margin of GaN HEMTs in practical power switching can be significantly underestimated using the static BV.

    Original languageEnglish
    Article number9367212
    Pages (from-to)505-508
    Number of pages4
    JournalIEEE Electron Device Letters
    Issue number4
    Publication statusPublished - Apr 2021

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering


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