Defect-controlled growth of GaN nanorods on (0001)sapphire by molecular beam epitaxy

D. Cherns, L. Meshi, I. Griffiths, S. Khongphetsak, S. V. Novikov, N. R.S. Farley, R. P. Campion, C. T. Foxon

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Transmission electron microscopy is used to reveal threading defects in single crystal c -oriented GaN nanorods grown on (0001)sapphire by molecular beam epitaxy. The defects are shown to be planar faults lying on {101̄0} planes and bounded by opposite partial screw dislocations with Burgers vectors of 1/2 <0001>. The faults nucleate, as dislocation half-loops, from points close to the GaN/(0001)sapphire interface. It is proposed that the spiral growth of the partial atomic step joining the emerging dislocations controls nanorod growth and accounts for the growth surface morphology. The significance of these defects for nanorod growth and applications is discussed.

Original languageEnglish
Article number111911
JournalApplied Physics Letters
Issue number11
StatePublished - 29 Sep 2008
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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