MBE growth of cubic AlN films on MgO substrate via cubic GaN buffer layer

Masahiro Kakuda, Kenzo Makino, Takashi Ishida, Shigeyuki Kuboya, Kentaro Onabe

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6 Citations (Scopus)


The effect of a cubic GaN (c-GaN) buffer layer in the cubic AlN (c-AlN) growth on MgO substrate was investigated. Cubic AlN films were grown on MgO(001) substrates via a c-GaN buffer layer by RF-MBE. The c-AlN growth was confirmed by RHEED and XRD reciprocal space mapping analysis. On the other hand, no cubic AlN was grown without the c-GaN buffer. Therefore the c-GaN buffer is necessary for the growth of c-AlN on MgO. It is considered that the lesser lattice-mismatch between c-AlN and c-GaN than c-AlN and MgO suppresses the hexagonal-phase inclusion. Only 0.5-nm-thick c-GaN buffer layer is enough for the c-AlN growth although the thin buffer layer causes rough surfaces of the c-AlN films. The effect of the c-AlN film growth condition on the c-AlN structural properties was also investigated. The growth temperature of 700 °C and an Al-rich growing surface are required for the growth of smooth-surface c-AlN films.

Original languageEnglish
Pages (from-to)558-561
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number3-4
Publication statusPublished - 2012 Mar


  • AlN
  • Cubic nitride
  • MBE
  • XRD

ASJC Scopus subject areas

  • Condensed Matter Physics


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