Interface structure, band alignment and built-in potentials at LaFeO${}_3$/$\text{n}$-SrTiO${}_3$ heterojunctions

Abstract

Interface structure at polar/non-polar interfaces has been shown to be a key factor in controlling emergent behavior in oxide heterostructures, including the LaFeO${}_3$/$\text{n}$-SrTiO${}_3$ system. We demonstrate via high energy resolution x-ray photoemission that epitaxial LaFeO${}_3$/$\text{n}$-SrTiO${}_3$ (001) heterojunctions engineered to have opposite interface polarities exhibit very similar band offsets and potential gradients within the LaFeO${}_3$ films. However, differences in the potential gradient within the SrTiO${}_3$ layer depending on polarity may promote hole diffusion into LaFeO${}_3$ for applications in photocatalysis.

10 pages, 3 figures; supplemental info: 6 pages, 3 figures

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• Thickness Dependent OER Electrocatalysis of Epitaxial LaFeO${}_3$ Thin Films
• Improved Description of Perovskite Oxide Crystal Structure and Electronic Properties using Self-Consistent Hubbard $U$ Corrections from ACBN0
• Interface properties and built-in potential profile of a LaCrO${}_3$/SrTiO${}_3$ superlattice determined by standing-wave excited photoemission spectroscopy
• Origin of interfacial conductivity at complex oxide heterointerfaces: possibility of electron transfer from water chemistry at surface oxygen vacancies
• Advances in Complex Oxide Quantum Materials Through New Approaches to Molecular Beam Epitaxy
• Resolving diverse oxygen transport pathways across Sr-doped lanthanum ferrite and metal-perovskite heterostructures
• Correlating surface stoichiometry and termination in SrTiO${}_3$ films grown by hybrid molecular beam epitaxy
• Order-Disorder Behavior at Thin Film Oxide Interfaces
• Band-Engineered LaFeO${}_3$-LaNiO${}_3$ Thin Film Interfaces for Electrocatalysis of Water
• Hard X-ray photoemission spectroscopy of LaVO${}_3$/SrTiO${}_3$: Band alignment and electronic reconstruction
• Probing the polar-nonpolar oxide interfaces using resonant x-ray standing wave techniques