Observation of quantized subband states and evidence for surface electron accumulation in CdO from angle-resolved photoemission spectroscopy

L. F. J. Piper, Leyla Colakerol, P. D. C. King, A. Schleife, J. Zuniga-Perez, Per-Anders Glans, Tim Learmonth, A. Federov, T. D. Veal, F. Fuchs, V. Munoz-Sanjose, F. Bechstedt, C. F. McConville, Kevin E. Smith

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71 Citations (Scopus)

Abstract

The electronic structure of well-ordered single-crystal thin films of CdO(100) has been studied using angle-resolved photoemission spectroscopy. Quantized electron subbands are observed above the valence-band maximum. The existence of these states provides evidence of an intrinsic electron accumulation space-charge layer near the CdO surface, an interpretation supported by coupled Poisson-Schrodinger calculations. The origin of the accumulation layer result is discussed in terms of the bulk band structure of CdO calculated using quasiparticle-corrected density-functional theory, which reveals that the conduction-band minimum at the Brillouin-zone center lies below the charge neutrality level.

Original languageEnglish
Pages (from-to)165127
Number of pages5
JournalPhysical Review. B, Condensed matter and materials physics
Volume78
Issue number16
DOIs
Publication statusPublished - Oct 2008

Keywords

  • TRANSPARENT CONDUCTING OXIDE
  • BAND-STRUCTURE
  • LAYERS

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