Influence of surface oxidation on the valence electron energy-loss spectrum of wurtzite aluminum nitride

Michael R.S. Huang, Rolf Erni, Chuan Pu Liu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The influence of surface oxidation on the low-loss spectrum of aluminum nitride (AlN) is investigated in electron energy-loss spectroscopy with scanning transmission electron microscopy. Contrary to intrinsic bulk AlN, oxidized AlN exhibits considerable spectral broadening both in the full width at half maximum of bulk plasmon and the subsidiary features. The modification in the low-loss lineshapes due to oxidation significantly complicates the determination of the dielectric function intrinsic to AlN. Simulations based on dielectric theory qualitatively consist with the experimental results while incorporating thick overlayers, further suggesting that the surface oxide of AlN can be rough and porous in nature.

Original languageEnglish
Article number061902
JournalApplied Physics Letters
Volume102
Issue number6
DOIs
Publication statusPublished - 2013 Feb 11

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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