Near-field photoluminescence spectroscopy of InGaN films grown by molecular-beam epitaxy

Jeongyong Kim, Kevan Samiee, Jeffrey O. White, Jae Min Myoung, Kyekyoon Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The spatial and spectral distribution of photoluminescence from InGaN films grown by plasma-assisted molecular-beam epitaxy are studied by near-field scanning optical microscopy. The luminescence intensity is low in the vicinity of pits in the surface that are believed to be associated with dislocations. For 20% In, the emission is random on a submicron length scale, but clumps into micron-sized regions at 27% In. The clustering is quantified by calculating the image entropy. Near-field spectra indicate that the regions of high intensity are not due to a local increase in In. Spatial variations in the luminescence wavelength indicate that composition fluctuations are enhanced with increasing In.

Original languageEnglish
Pages (from-to)989-991
Number of pages3
JournalApplied Physics Letters
Volume80
Issue number6
DOIs
Publication statusPublished - 2002 Feb 11

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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