Direct evidence of metallicity at ZnO (000 1̄ ) - (1×1 ) surfaces from angle-resolved photoemission spectroscopy

L. F.J. Piper, A. R.H. Preston, A. Fedorov, S. W. Cho, A. Demasi, K. E. Smith

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We have investigated the stability of O-polar ZnO (000 1̄) - (1×1) surfaces with photoemission spectroscopy and low-energy electron diffraction. We present direct evidence of quasi-two-dimensional electron gas (2DEG) formation (N2D ≤2× 1013 cm-2) at the O-face from our angle-resolved photoemission spectroscopy studies. These findings are discussed in terms of hydrogenation of the O-face by chemisorptions process and the energetic location of the charge-neutrality level of ZnO. Our results reveal insight into the role of hydrogen in forming the quasi-2DEG and stabilizing the O-polar nonreconstructed surface.

Original languageEnglish
Article number233305
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number23
DOIs
Publication statusPublished - 2010 Jun 22

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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