We investigate the influence of the gate-voltage dependence of the polarization charge on the electron sheet charge density in the channel and how it reflects on the device transfer and output characteristics in GaN HEMTs. We find that a 10% increase in the polarization charge is needed to match the experimental data when the gate-voltage dependence of the polarization charge is included in the theoretical model. This information is important for calibration in commercial device simulators and for better understanding of the quality of the GaN/AlGaN interface.

Original languageEnglish (US)
Pages (from-to)998-1006
Number of pages9
JournalIEEE Transactions on Electron Devices
Issue number5
StatePublished - 2009


  • GaN devices
  • Gate-voltage dependence
  • Polarization charge

ASJC Scopus subject areas

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


Dive into the research topics of 'Importance of the gate-dependent polarization charge on the operation of GaN HEMTs'. Together they form a unique fingerprint.

Cite this