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Superstructure of self-aligned hexagonal GaN nanorods formed on nitrided Si(111) surface

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<mark>Journal publication date</mark>24/09/2012
<mark>Journal</mark>Applied Physics Letters
Issue number13
Volume101
Number of pages4
Pages (from-to)131605-131608
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We present here the spontaneous formation of catalyst-free, self-aligned crystalline (wurtzite) nanorods on Si(111) surfaces modified by surface nitridation. Nanorods grown by molecular beam epitaxy on bare Si(111) and non-stoichiometric silicon nitride interface are found to be single crystalline but disoriented. Those grown on single crystalline Si3N4 intermediate layer are highly dense c-oriented hexagonal shaped nanorods. The morphology and the self-assembly of the nanorods shows an ordered epitaxial hexagonal superstructure, suggesting that they are nucleated at screw dislocations at the interface and grow spirally in the c-direction. The aligned nanorod assembly shows high-quality structural and optical emission properties.