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

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

doi:10.1063/1.5030897

Title: Band alignment and electrocatalytic activity at the p-n La_0.88Sr_0.12FeO₃/SrTiO₃ (001) heterojunction

Journal Article · Mon Jun 25 00:00:00 EDT 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5030897· OSTI ID:1495391

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^[1]; Chang, L. ^[2];

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^[3]; Wang, J. ^[2]; Chambers, S. A. ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical and Computational Sciences Directorate
Nanyang Technological Univ. (Singapore)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab.

Ferrites perovskites have exhibited promising p-type conductivity and oxygen evolution reaction (OER) activity. In this work, we investigate heteroepitaxial p-n junctions formed with La_0.88Sr_0.12FeO₃ 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.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830; MOE2013-T2-1-052; MOE2014-T2-1-099

OSTI ID:: 1495391

Alternate ID(s):: OSTI ID: 1457085

Report Number(s):: PNNL-SA-135023

Journal Information:: Applied Physics Letters, Vol. 112, Issue 26; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Epitaxy
P-N junctions
Band gap
Heterostructures
Oxygen evolution reaction
X-ray photoelectron spectroscopy

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

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References (39)

Cited By (4)

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Title: Band alignment and electrocatalytic activity at the p-n La_0.88Sr_0.12FeO₃/SrTiO₃ (001) heterojunction