Defect structure study of epitaxial InN films by transmission electron microscopy and X-ray diffraction

Wei-Li Chen, Yan Hsin Wang, Ming-Fei Chen, Man-Fang Huang, Jenn Chyuan Fan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The structural and morphological properties of InN epilayers grown on Si(1 1 1) substrates by plasma-assisted molecular beam epitaxy were studied. The mosaic characteristics such as grain size, twist and tilt angles were extracted by performing symmetric and asymmetric rocking curves and reciprocal space mapping. According to X-ray diffraction analysis, the dislocation densities reduced from 1×1011 to 2.27×1010 cm-2, when the substrate temperature was increased from 440 to 525 °C. Edge-type dislocation densities estimated both by fitting the FWHM of ω-scans of various lattice planes based on cosine theorem of spherical trigonometry and by grazing incidence (1 1 2- 0) diffraction agree with plan-view transmission electron microscopy (TEM) results. Surface morphology revealed grains with flat or terrace-like features separated by deep trenches. Faceted pits associated with screw-type threading dislocations are observed and their densities are in good consistence with the results obtained from X-ray diffraction. Improved film quality is achieved by applying highest growth temperature within InN dissociation limit.

Original languageEnglish
Pages (from-to)1463-1468
Number of pages6
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number5
DOIs
Publication statusPublished - 2010 Mar 1

Fingerprint

Defect structures
Epitaxial films
Transmission electron microscopy
X ray diffraction
transmission electron microscopy
Epilayers
defects
Growth temperature
Substrates
trigonometry
Full width at half maximum
diffraction
Molecular beam epitaxy
X ray diffraction analysis
Surface morphology
x rays
Diffraction
screws
grazing incidence
Plasmas

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

Cite this

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abstract = "The structural and morphological properties of InN epilayers grown on Si(1 1 1) substrates by plasma-assisted molecular beam epitaxy were studied. The mosaic characteristics such as grain size, twist and tilt angles were extracted by performing symmetric and asymmetric rocking curves and reciprocal space mapping. According to X-ray diffraction analysis, the dislocation densities reduced from 1×1011 to 2.27×1010 cm-2, when the substrate temperature was increased from 440 to 525 °C. Edge-type dislocation densities estimated both by fitting the FWHM of ω-scans of various lattice planes based on cosine theorem of spherical trigonometry and by grazing incidence (1 1 2- 0) diffraction agree with plan-view transmission electron microscopy (TEM) results. Surface morphology revealed grains with flat or terrace-like features separated by deep trenches. Faceted pits associated with screw-type threading dislocations are observed and their densities are in good consistence with the results obtained from X-ray diffraction. Improved film quality is achieved by applying highest growth temperature within InN dissociation limit.",
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Defect structure study of epitaxial InN films by transmission electron microscopy and X-ray diffraction. / Chen, Wei-Li; Wang, Yan Hsin; Chen, Ming-Fei; Huang, Man-Fang; Fan, Jenn Chyuan.

In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 42, No. 5, 01.03.2010, p. 1463-1468.

Research output: Contribution to journalArticle

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