Structural and optical properties of nonpolar GaN thin films

Z. H. Wu, A. M. Fischer, Fernando Ponce, B. Bastek, J. Christen, T. Wernicke, M. Weyers, M. Kneissl

Research output: Contribution to journalArticle

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Abstract

A correlation between the structural and optical properties of GaN thin films grown in the [11 2- 0] direction has been established using transmission electron microscopy and cathodoluminescence spectroscopy. The GaN films were grown on an r -plane sapphire substrate, and epitaxial lateral overgrowth was achieved using Si O2 masks. A comparison between the properties of GaN directly grown on sapphire and GaN laterally grown over the Si O2 mask is presented. The densities and dimensions of the stacking faults vary significantly with a high density of short faults in the window region and a much lower density of longer faults in the wing region. The low-temperature luminescence spectra consist of peaks at 3.465 and 3.41 eV, corresponding to emission from donor-bound excitons and basal-plane stacking faults, respectively. A correlation between the structural defects and the light emission characteristics is presented.

Original languageEnglish (US)
Article number171904
JournalApplied Physics Letters
Volume92
Issue number17
DOIs
StatePublished - 2008

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optical properties
crystal defects
sapphire
masks
thin films
cathodoluminescence
wings
light emission
excitons
luminescence
transmission electron microscopy
defects
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Wu, Z. H., Fischer, A. M., Ponce, F., Bastek, B., Christen, J., Wernicke, T., ... Kneissl, M. (2008). Structural and optical properties of nonpolar GaN thin films. Applied Physics Letters, 92(17), [171904]. https://doi.org/10.1063/1.2918834

Structural and optical properties of nonpolar GaN thin films. / Wu, Z. H.; Fischer, A. M.; Ponce, Fernando; Bastek, B.; Christen, J.; Wernicke, T.; Weyers, M.; Kneissl, M.

In: Applied Physics Letters, Vol. 92, No. 17, 171904, 2008.

Research output: Contribution to journalArticle

Wu, ZH, Fischer, AM, Ponce, F, Bastek, B, Christen, J, Wernicke, T, Weyers, M & Kneissl, M 2008, 'Structural and optical properties of nonpolar GaN thin films', Applied Physics Letters, vol. 92, no. 17, 171904. https://doi.org/10.1063/1.2918834
Wu ZH, Fischer AM, Ponce F, Bastek B, Christen J, Wernicke T et al. Structural and optical properties of nonpolar GaN thin films. Applied Physics Letters. 2008;92(17). 171904. https://doi.org/10.1063/1.2918834
Wu, Z. H. ; Fischer, A. M. ; Ponce, Fernando ; Bastek, B. ; Christen, J. ; Wernicke, T. ; Weyers, M. ; Kneissl, M. / Structural and optical properties of nonpolar GaN thin films. In: Applied Physics Letters. 2008 ; Vol. 92, No. 17.
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