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

L. Wang, Y. Du, L. Chang, K. A. Stoerzinger, M. E. Bowden, J. Wang, S. A. Chambers

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Abstract

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.

Original languageEnglish (US)
Article number261601
JournalApplied Physics Letters
Volume112
Issue number26
DOIs
StatePublished - Jun 25 2018
Externally publishedYes

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© 2018 Author(s).

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