Intrinsic energy band alignment of functional oxides
Journal article, 2014
The energy band alignment at interfaces between different materials is a key factor, which determines the function of electronic devices. While the energy band alignment of conventional semiconductors is quite well understood, systematic experimental studies on oxides are still missing. This work presents an extensive study on the intrinsic energy band alignment of a wide range of functional oxides using photoelectron spectroscopy with in-situ sample preparation. The studied materials have particular technological importance in diverse fields as solar cells, piezotronics, multiferroics, photoelectrochemistry and oxide electronics. Particular efforts have been made to verify the validity of transitivity, in order to confirm the intrinsic nature of the obtained band alignment and to understand the underlying principles. Valence band offsets up to 1.6 eV are observed. The large variation of valence band maximum energy can be explained by the different orbital contributions to the density of states in the valence band. The framework provided by this work enables the general understanding and prediction of energy band alignment at oxide interfaces, and furthermore the tailoring of energy level matching for charge transfer in functional oxides. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
electronic structure
transitivity
photoelectron spectroscopy
energy band alignment
functional oxides
Author
Shunyi Li
Technische Universitat Darmstadt
F. Chen
Technische Universitat Darmstadt
R. Schafranek
Technische Universitat Darmstadt
T. J. M. Bayer
Technische Universitat Darmstadt
Karsten Rachut
Technische Universitat Darmstadt
A. Fuchs
Technische Universitat Darmstadt
S. Siol
Technische Universitat Darmstadt
M. Weidner
Technische Universitat Darmstadt
M. Hohmann
Technische Universitat Darmstadt
Verena Pfeifer
Technische Universitat Darmstadt
Jan Morasch
Technische Universitat Darmstadt
C. Ghinea
Technische Universitat Darmstadt
E. Arveux
Technische Universitat Darmstadt
R. Gunzler
Technische Universitat Darmstadt
J. Gassmann
Technische Universitat Darmstadt
C. Korber
Technische Universitat Darmstadt
Y. Gassenbauer
Technische Universitat Darmstadt
F. Sauberlich
Technische Universitat Darmstadt
G. V. Rao
Technische Universitat Darmstadt
S. Payan
Institut de Chimie de la Matiere Condensee de Bordeaux
M. Maglione
Institut de Chimie de la Matiere Condensee de Bordeaux
C. Chirila
Institut de Physique des Materiaux, Bucarest-Magurele
L. Pintilie
Institut de Physique des Materiaux, Bucarest-Magurele
L. C. Jia
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
K. Ellmer
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
M. Naderer
Technische Universitat Graz
K. Reichmann
Technische Universitat Graz
U. Bottger
Rheinisch-Westfalische Technische Hochschule Aachen
S. Schmelzer
Rheinisch-Westfalische Technische Hochschule Aachen
R. C. Frunza
Jozef Stefan Institute
H. Ursic
Jozef Stefan Institute
B. Malic
Jozef Stefan Institute
W. B. Wu
Hefei National Laboratory for Physical Sciences at Microscale
Paul Erhart
Chalmers, Applied Physics, Materials and Surface Theory
A. Klein
Technische Universitat Darmstadt
Physica Status Solidi - Rapid Research Letetrs
1862-6254 (ISSN) 1862-6270 (eISSN)
Vol. 8 6 571-576Areas of Advance
Nanoscience and Nanotechnology
Materials Science
Subject Categories (SSIF 2011)
Energy Engineering
Condensed Matter Physics
Infrastructure
C3SE (Chalmers Centre for Computational Science and Engineering)
DOI
10.1002/pssr.201409034