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Title: Atomic Layer Deposition of Metastable β-Fe 2 O 3 via Isomorphic Epitaxy for Photoassisted Water Oxidation

Here, we report the growth and photoelectrochemical (PEC) characterization of the uncommon bibyite phase of iron(III) oxide (β-Fe 2O 3) epitaxially stabilized via atomic layer deposition on an conductive, transparent, and isomorphic template (Sn-doped In 2O 3). Furthermore, as a photoanode, unoptimized β-Fe 2O 3 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. Finally, 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.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  3. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
Publication Date:
Grant/Contract Number:
AC02-06CH11357; SC0001059; FG02-94ER14466
Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 6; Journal Issue: 24; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; atomic layer deposition; epitaxial stabilization; iron(III) oxide; PEC water oxidation; α-Fe2O3; β-Fe2O3
OSTI Identifier:
1355777

Emery, Jonathan D., Schlepütz, Christian M., Guo, Peijun, Riha, Shannon C., Chang, Robert P. H., and Martinson, Alex B. F.. Atomic Layer Deposition of Metastable β-Fe 2 O 3 via Isomorphic Epitaxy for Photoassisted Water Oxidation. United States: N. p., Web. doi:10.1021/am507065y.
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-Fe 2 O 3 via Isomorphic Epitaxy for Photoassisted Water Oxidation. United States. doi:10.1021/am507065y.
Emery, Jonathan D., Schlepütz, Christian M., Guo, Peijun, Riha, Shannon C., Chang, Robert P. H., and Martinson, Alex B. F.. 2014. "Atomic Layer Deposition of Metastable β-Fe 2 O 3 via Isomorphic Epitaxy for Photoassisted Water Oxidation". United States. doi:10.1021/am507065y. https://www.osti.gov/servlets/purl/1355777.
@article{osti_1355777,
title = {Atomic Layer Deposition of Metastable β-Fe 2 O 3 via Isomorphic Epitaxy for Photoassisted Water Oxidation},
author = {Emery, Jonathan D. and Schlepütz, Christian M. and Guo, Peijun and Riha, Shannon C. and Chang, Robert P. H. and Martinson, Alex B. F.},
abstractNote = {Here, 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). Furthermore, 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. Finally, 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.},
doi = {10.1021/am507065y},
journal = {ACS Applied Materials and Interfaces},
number = 24,
volume = 6,
place = {United States},
year = {2014},
month = {12}
}