Fermi level stabilization and band edge energies in CdxZn 1-xO alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Douglas M. Detert
  • Kyle B. Tom
  • Corsin Battaglia
  • Jonathan D. Denlinger
  • Sunnie H.N. Lim
  • Ali Javey
  • André Anders
  • Oscar D. Dubon
  • Wladek Walukiewicz

Detail(s)

Original languageEnglish
Article number233708
Journal / PublicationJournal of Applied Physics
Volume115
Issue number23
Publication statusPublished - 21 Jun 2014
Externally publishedYes

Abstract

We have measured the band edge energies of CdxZn1-xO thin films as a function of composition by three independent techniques: we determine the Fermi level stabilization energy by pinning the Fermi level with ion irradiation, measure the binding energy of valence band states and core levels by X-ray photoelectron spectroscopy, and probe shifts in the conduction band and valence band density of states using soft X-ray absorption and emission spectroscopy, respectively. The three techniques find consensus in explaining the origin of compositional trends in the optical-bandgap narrowing upon Cd incorporation in wurtzite ZnO and widening upon Zn incorporation in rocksalt CdO. The conduction band minimum is found to be stationary for both wurtzite and rocksalt alloys, and a significant upward rise of the valence band maximum accounts for the majority of these observed bandgap changes. Given these band alignments, alloy disorder scattering is found to play a negligible role in decreasing the electron mobility for all alloys. These band alignment details, combined with the unique optical and electrical properties of the two phase regimes, make CdZnO alloys attractive candidates for photoelectrochemical water splitting applications. © 2014 AIP Publishing LLC.

Citation Format(s)

Fermi level stabilization and band edge energies in CdxZn 1-xO alloys. / Detert, Douglas M.; Tom, Kyle B.; Battaglia, Corsin; Denlinger, Jonathan D.; Lim, Sunnie H.N.; Javey, Ali; Anders, André; Dubon, Oscar D.; Yu, Kin M.; Walukiewicz, Wladek.

In: Journal of Applied Physics, Vol. 115, No. 23, 233708, 21.06.2014.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal