InN nanocolumns grown by plasma-assisted molecular beam epitaxy on A-plane GaN templates

Grandal, J.; Sánchez-García, M. A.; Calleja, E.; Gallardo, E.; Calleja, J. M.; Luna, E.; Trampert, A.; Jahn, A.
June 2009
Applied Physics Letters;6/1/2009, Vol. 94 Issue 22, p221908
Academic Journal
This work reports on the growth of wurtzite InN nanocolumns on A-plane GaN templates and on their structural and optical characterization by scanning and transmission electron microscopy, photoluminescence, and Raman spectroscopy. InN nanocolumns grown on A-plane substrates show sharp and pyramidal-like top surfaces that could be attributed to A-plane and M-plane facets, instead of the hexagonal top surfaces observed in nanocolumns grown on C-plane surfaces. The results of these characterization techniques show that the nanocolumns preserve the nonpolar growth orientation of the GaN templates. Good crystal quality is expected from the low temperature (13 K) photoluminescence dominant peak at 0.69 eV.


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