Journal article
Energy Level Alignment and Cation Charge States at the LaFeO3/LaMnO3 (001) Heterointerface
Advanced materials interfaces, v 4(14), pn/a
21 Jul 2017
Abstract
The electronic properties of LaFeO3/LaMnO3 epitaxial heterojunctions are investigated to determine the valence and conduction band offsets and the nominal Mn and Fe valence states at the interface. Studying a systematic series of (LaFeO3)(n)/(LaMnO3)(m) bilayers (m approximate to 50) epitaxially grown in the (001) orientation using molecular beam epitaxy, layer-resolved electron energy loss spectroscopy reveals a lack of significant interfacial charge transfer, with a nominal 3+ valence state observed for both Mn and Fe across the interface. Through a combination of variable angle spectroscopic ellipsometry and hard X-ray photoelectron spectroscopy, type I energy level alignments are obtained at the LaFeO3/LaMnO3 interface with positive valence and conduction band offsets of (1.20 +/- 0.07) eV and (0.5-0.7 +/- 0.3) eV, respectively, with minimal band bending. Variable temperature resistivity measurements reveal that the bilayers remain insulating and that the presence of the heterojunction does not result in a conducting interface.
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Details
- Title
- Energy Level Alignment and Cation Charge States at the LaFeO3/LaMnO3 (001) Heterointerface
- Creators
- Sergey Y. Smolin - Drexel UniversityAmber K. Choquette - Drexel UniversityRegan G. Wilks - Helmholtz-Zentrum Berlin für Materialien und EnergieNicolas Gauquelin - University of AntwerpRoberto Felix - Helmholtz-Zentrum Berlin für Materialien und EnergieDominic Gerlach - National Institute for Materials ScienceShigenori Ueda - Japan Synchrotron Radiation Research InstituteAlex L. Krick - Drexel UniversityJohan Verbeeck - Univ Antwerp, EMAT, Groenenborgerlaan 171, B-2020 Antwerp, BelgiumMarcus Bear - Helmholtz Zentrum Berlin Mat & Energie GmbH, Renewable Energy, Hahn Meitner Pl 1, D-14109 Berlin, GermanyJason B. Baxter - Drexel UniversitySteven J. May - Drexel University
- Publication Details
- Advanced materials interfaces, v 4(14), pn/a
- Publisher
- Wiley
- Number of pages
- 8
- Grant note
- DE-ACO2-98CH10886 / U.S. Department of Energy, Office of Basic Energy Sciences; United States Department of Energy (DOE) 1151649 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) Hercules Fund from the Flemish Government Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) 5708457 / German Academic Exchange Service (DAAD) through the Research Internships in Science and Engineering (RISE) professional program; Deutscher Akademischer Austausch Dienst (DAAD) G.0044.13N / FWO project; FWO GOA project "Solarpaint" of the University of Antwerp ECCS-1201957; DMR-1151649 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; Chemical and Biological Engineering
- Web of Science ID
- WOS:000406068400011
- Scopus ID
- 2-s2.0-85018690636
- Other Identifier
- 991019168824904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Materials Science, Multidisciplinary