Journal
APPLIED PHYSICS LETTERS
Volume 112, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5030897
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Funding
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Science and Engineering [10122]
- Ministry of Education, Singapore [MOE2013-T2-1-052, MOE2014-T2-1-099]
- Linus Pauling Distinguished Post-doctoral Fellowship at Pacific Northwest National Laboratory [PNNL LDRD 69319]
- Office of Biological and Environmental Research
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Ferrite perovskites have exhibited promising p-type conductivity and oxygen evolution reaction (OER) activity. In this work, we investigate heteroepitaxial p-n junctions formed by La0.88Sr0.12FeO3 and n-SrTiO3(001). Sr substitution for La in LaFeO3 is shown to be effective for introducing p-type conductivity, lowering the optical bandgap, and enhancing electrocatalytic OER. A staggered, typeII band alignment with a large built-in potential within the LSFO forms due to the polar interface. This electronic structure facilitates charge transfer across the p-n junction and accounts for the strongly thickness-dependent extent of OER we observe. Published by AIP Publishing.
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