Atomic layer deposition of metastable β-Fe2O3 via isomorphic epitaxy for photoassisted water oxidation

Jonathan D. Emery, Christian M. Schlepütz, Peijun Guo, Shannon C. Riha, Robert P. H. Chang, Alex B F Martinson

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We report the growth and photoelectrochemical (PEC) characterization of the uncommon bibyite phase of iron(III) oxide (β-Fe2O3) epitaxially stabilized via atomic layer deposition on an conductive, transparent, and isomorphic template (Sn-doped In2O3). As a photoanode, unoptimized β-Fe2O3 ultrathin films perform similarly to their ubiquitous α-phase (hematite) counterpart, but reveal a more ideal bandgap (1.8 eV), a ∼0.1 V improved photocurrent onset potential, and longer wavelength (>600 nm) spectral response. Stable operation under basic water oxidation justifies further exploration of this atypical phase and motivates the investigation of other unexplored metastable phases as new PEC materials.

Original languageEnglish
Pages (from-to)21894-21900
Number of pages7
JournalACS Applied Materials and Interfaces
Volume6
Issue number24
DOIs
Publication statusPublished - Dec 24 2014

Fingerprint

Metastable phases
Atomic layer deposition
Ultrathin films
Hematite
Photocurrents
Iron oxides
Epitaxial growth
Energy gap
Wavelength
Oxidation
Water
ferric oxide

Keywords

  • atomic layer deposition
  • epitaxial stabilization
  • iron(III) oxide
  • PEC water oxidation
  • α-FeO
  • β-FeO

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Atomic layer deposition of metastable β-Fe2O3 via isomorphic epitaxy for photoassisted water oxidation. / Emery, Jonathan D.; Schlepütz, Christian M.; Guo, Peijun; Riha, Shannon C.; Chang, Robert P. H.; Martinson, Alex B F.

In: ACS Applied Materials and Interfaces, Vol. 6, No. 24, 24.12.2014, p. 21894-21900.

Research output: Contribution to journalArticle

Emery, Jonathan D. ; Schlepütz, Christian M. ; Guo, Peijun ; Riha, Shannon C. ; Chang, Robert P. H. ; Martinson, Alex B F. / Atomic layer deposition of metastable β-Fe2O3 via isomorphic epitaxy for photoassisted water oxidation. In: ACS Applied Materials and Interfaces. 2014 ; Vol. 6, No. 24. pp. 21894-21900.
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