Surface optical phonon modes in ternary aligned crystalline InGaN/GaN multi-quantum-well nanopillar arrays

Shang En Wu, S. Dhara, Tao Hung Hsueh, Yi Feng Lai, Cheng Yu Wang, Chuan Pu Liu

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The optical properties of focused ion beam-engraved, perfectly aligned and spatially controlled multi-quantum-well (MQW) InGaN/GaN nanopillars were investigated. Crystalline MQW nanopillars with a diameter of 30-95 nm and high aspect ratios (7: 1-16: 1) showed a maximum of three-fold enhancement in emission intensity per unit active area. A light-emitting contour map of Taiwan is drawn with a nanopillar structure to demonstrate the site control of the technique adopted in the present study. Raman scattering studies were used to characterize the newly created surfaces. Unknown peaks in GaN and InGaN nanostructures are identified for surface optical (SO) phonon modes with proper assignments of wave vectors using multiple excitations, and the SO mode for the ternary phase is reported for the first time.

Original languageEnglish
Pages (from-to)2044-2049
Number of pages6
JournalJournal of Raman Spectroscopy
Volume40
Issue number12
DOIs
Publication statusPublished - 2009 Dec

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Spectroscopy

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