Microstructural and optical properties of self-organized GaN quantum-dot assemblies

G. N. Panin, Y. S. Park, T. W. Kang, T. W. Kim, K. L. Wang, M. Bao

Research output: Contribution to journalArticle

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Abstract

The microstructural and optical properties of GaN quantum-dot (QD) assemblies self-organized in two-dimensional GaN epilayers grown on Al xGa 1-xN layers by using plasma-assisted molecular beam epitaxy were investigated with high-resolution scanning electron microscopy (HRSEM) and cathodoluminescence (CL) measurements. The HRSEM images showed that QD assemblies were formed in separate regions of the slightly stressed GaN epilayer on the Al 0.4Ga 0.6N surface and that the size and the density of the self-organized QD assemblies were affected significantly by the thickness and the surface polarity of the GaN layer. The CL spectra of the GaN QD assemblies showed a blue shift of the near band gap emission, and the position of the emission peak depended on the polarity and the thickness of the GaN epilayer. Deep level luminescence spectra indicated the existence of impurity-assisted QD assembly formation.

Original languageEnglish
Article number043527
JournalJournal of Applied Physics
Volume97
Issue number4
DOIs
StatePublished - 2005 Feb 15

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assemblies
quantum dots
optical properties
cathodoluminescence
polarity
scanning electron microscopy
high resolution
blue shift
self assembly
molecular beam epitaxy
assembly
luminescence
impurities

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Panin, G. N. ; Park, Y. S. ; Kang, T. W. ; Kim, T. W. ; Wang, K. L. ; Bao, M. / Microstructural and optical properties of self-organized GaN quantum-dot assemblies. In: Journal of Applied Physics. 2005 ; Vol. 97, No. 4.
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Microstructural and optical properties of self-organized GaN quantum-dot assemblies. / Panin, G. N.; Park, Y. S.; Kang, T. W.; Kim, T. W.; Wang, K. L.; Bao, M.

In: Journal of Applied Physics, Vol. 97, No. 4, 043527, 15.02.2005.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructural and optical properties of self-organized GaN quantum-dot assemblies

AU - Panin, G. N.

AU - Park, Y. S.

AU - Kang, T. W.

AU - Kim, T. W.

AU - Wang, K. L.

AU - Bao, M.

PY - 2005/2/15

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N2 - The microstructural and optical properties of GaN quantum-dot (QD) assemblies self-organized in two-dimensional GaN epilayers grown on Al xGa 1-xN layers by using plasma-assisted molecular beam epitaxy were investigated with high-resolution scanning electron microscopy (HRSEM) and cathodoluminescence (CL) measurements. The HRSEM images showed that QD assemblies were formed in separate regions of the slightly stressed GaN epilayer on the Al 0.4Ga 0.6N surface and that the size and the density of the self-organized QD assemblies were affected significantly by the thickness and the surface polarity of the GaN layer. The CL spectra of the GaN QD assemblies showed a blue shift of the near band gap emission, and the position of the emission peak depended on the polarity and the thickness of the GaN epilayer. Deep level luminescence spectra indicated the existence of impurity-assisted QD assembly formation.

AB - The microstructural and optical properties of GaN quantum-dot (QD) assemblies self-organized in two-dimensional GaN epilayers grown on Al xGa 1-xN layers by using plasma-assisted molecular beam epitaxy were investigated with high-resolution scanning electron microscopy (HRSEM) and cathodoluminescence (CL) measurements. The HRSEM images showed that QD assemblies were formed in separate regions of the slightly stressed GaN epilayer on the Al 0.4Ga 0.6N surface and that the size and the density of the self-organized QD assemblies were affected significantly by the thickness and the surface polarity of the GaN layer. The CL spectra of the GaN QD assemblies showed a blue shift of the near band gap emission, and the position of the emission peak depended on the polarity and the thickness of the GaN epilayer. Deep level luminescence spectra indicated the existence of impurity-assisted QD assembly formation.

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