Band alignment and electrocatalytic activity at the p-n La0.88Sr0.12FeO3/SrTiO3(001) heterojunction

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 con...

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Bibliographic Details
Published in:Applied physics letters 2018-06, Vol.112 (26)
Main Authors: Wang, L., Du, Y., Chang, L., Stoerzinger, K. A., Bowden, M. E., Wang, J., Chambers, S. A.
Format: Article
Language:English
Subjects:
Alignment
Applied physics
Band gap
Charge transfer
Electronic structure
Epitaxy
Heterojunctions
Heterostructures
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Oxygen evolution reaction
Oxygen evolution reactions
P-N junctions
Perovskites
Strontium titanates
Substitution reactions
X-ray photoelectron spectroscopy
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Summary: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, type-II 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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5030897