Energy Level Alignment and Cation Charge States at the LaFeO 3 /LaMnO 3 (001) Heterointerface
Abstract
The electronic properties of LaFeO 3 /LaMnO 3 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 (LaFeO 3 ) n /(LaMnO 3 ) m bilayers ( m ≈ 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 LaFeO 3 /LaMnO 3 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.
- Authors:
-
- Department of Chemical and Biological Engineering Drexel University Philadelphia PA 19104 USA
- Department of Materials Science and Engineering Drexel University Philadelphia PA 19104 USA
- Renewable Energy Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH Hahn‐Meitner‐Platz 1 D‐14109 Berlin Germany, Energy Materials In‐Situ Laboratory Berlin (EMIL) Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH Albert‐Einstein‐Str. 15 D‐12489 Berlin Germany
- EMAT‐ University of Antwerp Groenenborgerlaan 171 B‐2020 Antwerp Belgium
- Renewable Energy Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH Hahn‐Meitner‐Platz 1 D‐14109 Berlin Germany
- MANA/Nano‐Electronics Materials Unit National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan
- Synchrotron X‐ray Station at SPring‐8 NIMS. 1‐1‐1 Kouto Sayo‐cho Hyogo 679‐5148 Japan, Quantum Beam Unit NIMS 1‐2‐1 Sengen Tsukuba Ibaraki 305‐0047 Japan
- Renewable Energy Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH Hahn‐Meitner‐Platz 1 D‐14109 Berlin Germany, Energy Materials In‐Situ Laboratory Berlin (EMIL) Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH Albert‐Einstein‐Str. 15 D‐12489 Berlin Germany, Institut für Physik und Chemie Brandenburgische Technische Universität Cottbus‐Senftenberg Platz der Deutschen Einheit 1 D‐03046 Cottbus Germany
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1401544
- Grant/Contract Number:
- DE‐ACO2‐98CH10886
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Advanced Materials Interfaces
- Additional Journal Information:
- Journal Name: Advanced Materials Interfaces Journal Volume: 4 Journal Issue: 14; Journal ID: ISSN 2196-7350
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
Smolin, Sergey Y., Choquette, Amber K., Wilks, Regan G., Gauquelin, Nicolas, Félix, Roberto, Gerlach, Dominic, Ueda, Shigenori, Krick, Alex L., Verbeeck, Johan, Bär, Marcus, Baxter, Jason B., and May, Steven J. Energy Level Alignment and Cation Charge States at the LaFeO 3 /LaMnO 3 (001) Heterointerface. Germany: N. p., 2017.
Web. doi:10.1002/admi.201700183.
Smolin, Sergey Y., Choquette, Amber K., Wilks, Regan G., Gauquelin, Nicolas, Félix, Roberto, Gerlach, Dominic, Ueda, Shigenori, Krick, Alex L., Verbeeck, Johan, Bär, Marcus, Baxter, Jason B., & May, Steven J. Energy Level Alignment and Cation Charge States at the LaFeO 3 /LaMnO 3 (001) Heterointerface. Germany. https://doi.org/10.1002/admi.201700183
Smolin, Sergey Y., Choquette, Amber K., Wilks, Regan G., Gauquelin, Nicolas, Félix, Roberto, Gerlach, Dominic, Ueda, Shigenori, Krick, Alex L., Verbeeck, Johan, Bär, Marcus, Baxter, Jason B., and May, Steven J. Wed .
"Energy Level Alignment and Cation Charge States at the LaFeO 3 /LaMnO 3 (001) Heterointerface". Germany. https://doi.org/10.1002/admi.201700183.
@article{osti_1401544,
title = {Energy Level Alignment and Cation Charge States at the LaFeO 3 /LaMnO 3 (001) Heterointerface},
author = {Smolin, Sergey Y. and Choquette, Amber K. and Wilks, Regan G. and Gauquelin, Nicolas and Félix, Roberto and Gerlach, Dominic and Ueda, Shigenori and Krick, Alex L. and Verbeeck, Johan and Bär, Marcus and Baxter, Jason B. and May, Steven J.},
abstractNote = {The electronic properties of LaFeO 3 /LaMnO 3 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 (LaFeO 3 ) n /(LaMnO 3 ) m bilayers ( m ≈ 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 LaFeO 3 /LaMnO 3 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.},
doi = {10.1002/admi.201700183},
journal = {Advanced Materials Interfaces},
number = 14,
volume = 4,
place = {Germany},
year = {Wed Apr 26 00:00:00 EDT 2017},
month = {Wed Apr 26 00:00:00 EDT 2017}
}
https://doi.org/10.1002/admi.201700183
Web of Science
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