The influence of nitrogen ion energy on the quality of GaN films grown with molecular beam epitaxy

T. C. Fu, Nathan Newman, E. Jones, J. S. Chan, X. Liu, M. D. Rubin, N. W. Cheung, E. R. Weber

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Since the growth of GaN using molecular beam epitaxy (MBE) occurs under metastable growth conditions, activated nitrogen is required to drive the forward synthesis reaction. In the process of exciting the nitrogen using a plasma or ion-beam source, species with large kinetic energies are generated. Impingement on the growth surface by these species can result in subsurface damage to the growing film, as well as an enhancement of the reverse decomposition reaction rate. In this study, we investigate the effect of the kinetic energy of the impinging nitrogen ions during growth on the resulting optical and structural properties of GaN films. Strong band-edge photoluminescence and cathodoluminescence are found when a kinetic energy of ∼10 eV are used, while luminescence is not detectable when the kinetic energies exceeds 18 eV. Also, we find that the use of conductive SiC substrates results in more homogeneous luminescence than the use of insulating sapphire substrates. This is attributed to sample surface charging in the case of sapphire substrates and subsequent variation in the incident ion flux and kinetic energy across the growth surface. This study clearly shows that the quality of GaN films grown by MBE are presently limited by damage from the impingement of high energy species on the growth surface.

Original languageEnglish (US)
Pages (from-to)249-255
Number of pages7
JournalJournal of Electronic Materials
Volume24
Issue number4
DOIs
StatePublished - Apr 1995
Externally publishedYes

Fingerprint

nitrogen ions
Molecular beam epitaxy
Kinetic energy
Nitrogen
molecular beam epitaxy
Ions
kinetic energy
Aluminum Oxide
impingement
Sapphire
energy
Luminescence
sapphire
Substrates
luminescence
damage
nitrogen
Cathodoluminescence
Film growth
cathodoluminescence

Keywords

  • Activated nitrogen
  • GaN
  • molecular beam epitaxy (MBE)
  • nitrogen ion energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Electrical and Electronic Engineering

Cite this

The influence of nitrogen ion energy on the quality of GaN films grown with molecular beam epitaxy. / Fu, T. C.; Newman, Nathan; Jones, E.; Chan, J. S.; Liu, X.; Rubin, M. D.; Cheung, N. W.; Weber, E. R.

In: Journal of Electronic Materials, Vol. 24, No. 4, 04.1995, p. 249-255.

Research output: Contribution to journalArticle

Fu, T. C. ; Newman, Nathan ; Jones, E. ; Chan, J. S. ; Liu, X. ; Rubin, M. D. ; Cheung, N. W. ; Weber, E. R. / The influence of nitrogen ion energy on the quality of GaN films grown with molecular beam epitaxy. In: Journal of Electronic Materials. 1995 ; Vol. 24, No. 4. pp. 249-255.
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