Normally-off AlN/β-Ga2O3field-effect transistors using polarization-induced doping

Kang Song, Haochen Zhang, Houqiang Fu, Chen Yang, Rajendra Singh, Yuji Zhao, Haiding Sun, Shibing Long

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

III-nitrides and beta-phase gallium oxide (β-Ga2O3) are currently two intensively investigated wide bandgap semiconductor materials for power electronics. Due to the relatively low lattice mismatch between the two material systems and the availability of bulk AlN, GaN and β-Ga2O3 substrates, epitaxial growth of III-nitrides on β-Ga2O3 or vice versa has been realized. However, the design of power devices by integrating the two material systems is still lacking. Here we numerically investigate an AlN/β-Ga2O3 heterostructure by taking advantage of polarization-induced doping to realize high-performance enhancement-mode transistors. Induced by polarization effects at the AlN/β-Ga2O3 interface, a 2-dimensional electron gas concentration can reach up to 8.1 1019 cm-3 in the channel. On top of the channel, a p-GaN gate was introduced and eventually a normally-off AlN/β-Ga2O3 field-effect transistor with tunable positive threshold voltages was realized. Furthermore, we inserted an unintentionally doped GaN back barrier layer to suppress the drain leakage current. Eventually, the transfer and output characteristics of the proposed device with different structural parameters were further investigated and analyzed in the pursuit of high-performance III-nitrides/Ga2O3-based power devices.

Original languageEnglish (US)
Article number345107
JournalJournal of Physics D: Applied Physics
Volume53
Issue number34
DOIs
StatePublished - Aug 19 2020

Keywords

  • Field-effect transistors
  • Normally-off
  • P-gan gate
  • Polarization-induceddoping
  • β -GaO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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