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 journalArticlepeer-review

16 Citations (Scopus)


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
Issue number24
Publication statusPublished - Dec 24 2014


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

ASJC Scopus subject areas

  • Materials Science(all)

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