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

Jonathan Daniel Emery, Christian M. Schlepütz, Peijun Guo, Shannon C. Riha, R P H Chang, Alex B.F. Martinson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

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 (US)
Pages (from-to)21894-21900
Number of pages7
JournalACS Applied Materials and Interfaces
Volume6
Issue number24
DOIs
StatePublished - Dec 24 2014

Keywords

  • 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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