MOCVD of gallium nitride nanostructures using (N3)2Ga{(CH2)3NR2}, R = Me, Et, as a single molecule precursor: Morphology control and materials characterization

Jayaprakash Khanderi, Andreas Wohlfart, Harish Parala, Anjana Devi, Julia Hambrock, Alexander Birkner, Roland A. Fischer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Gallium nitride nanostructures such as nanopillars, nanorods and nanowires were grown by metal organic chemical vapor deposition (MOCVD) on a c-plane sapphire substrate using the single molecule precursors (SMPs) bisazido(dimethylaminopropyl)gallium (BAZIGA, 1) and its ethyl derivative bisazido(diethylaminopropyl)gallium (E-BAZIGA, 2) in horizontal and vertical stagnation flow cold-wall reactors. It has been found that, at a given growth temperature, H2 and the total pressure have a profound influence on the morphology of the GaN nanostructure, which changes front self-organized nanopillars to randomly oriented nanowires through dense, ordered nanorods. The GaN nanopillars grown by SMPs 1 and 2 in the presence of N2 were most likely to follow a vapor-liquid-solid (VLS) autocatalytic growth process and exhibit a surface distribution density of 3.8 × 1010-4.5 × 1012 cm-2, whereas GaN nanorods and nanowires were produced in the presence of various amounts of H2. The surface distribution density in the case of the nanorods was dependent on the H2 flow. X-Ray diffraction and selected area electron diffraction revealed that the nanostructures were a single crystalline and hexagonal modification of GaN. The nanostructures were easily detached front the substrate and dispersed in organic solvents and showed strong photoluminescence in the near UV region (2.7-3.0 eV).

Original languageEnglish (US)
Pages (from-to)1438-1446
Number of pages9
JournalJournal of Materials Chemistry
Volume13
Issue number6
DOIs
StatePublished - Jun 1 2003
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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