Volume 42, Issue 12-13 p. 1690-1694
Research Article

Influence of the ferroelectric polarization on the electronic structure of BaTiO3 thin films

N. Barrett

Corresponding Author

N. Barrett

CEA, DSM/IRAMIS/SPCSI/LENSIS, Bâtiment 462, 91191 Gif sur Yvette cedex, France

CEA, IRAMIS/LENSIS/SPCSI, Bâtiment 462, 91191 Gif sur Yvette cedex, France.Search for more papers by this author
J. Rault

J. Rault

CEA, DSM/IRAMIS/SPCSI/LENSIS, Bâtiment 462, 91191 Gif sur Yvette cedex, France

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I. Krug

I. Krug

Institut f. Festkörperforschung IFF-9, Forschungszentrum Jülich, 52425 Jülich, Germany

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B. Vilquin

B. Vilquin

Institut des Nanotechnologies de Lyon (INL), 36, avenue Guy de Collongue, 69134 Ecully, France

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G. Niu

G. Niu

Institut des Nanotechnologies de Lyon (INL), 36, avenue Guy de Collongue, 69134 Ecully, France

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B. Gautier

B. Gautier

Institut National des Sciences Appliquées de Lyon (INSA), 20, avenue Albert Einstein, 69621 Villeurbanne, France

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D. Albertini

D. Albertini

Institut National des Sciences Appliquées de Lyon (INSA), 20, avenue Albert Einstein, 69621 Villeurbanne, France

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P. Lecoeur

P. Lecoeur

Institut d'électronique fondamentale, Bât. 220, Université Paris-Sud, 91405 Orsay Cedex, France

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O. Renault

O. Renault

CEA LETI/MINATEC, SPCIO, 17 avenue des Martyrs, 38054 Grenoble cedex, France

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First published: 18 November 2010
Citations: 17

Paper published as part of ALC 2009 special issue.

Abstract

Micron scale ferroelectric (FE) domains have been written into a 20-nm-thick epitaxial thin film of BaTiO3 (001) [BTO(001)] on a Nb-doped SrTiO3 substrate using a piezoforce microscope (PFM). The domain-dependent electronic structure has been studied using fully energy-filtered photoemission electron microscopy (PEEM) and synchrotron radiation. Shifts, induced by FE polarization, of up to 300 meV were observed in the work function of the sample. The surface is Ba-O terminated. Polarization-induced distortion of the electronic structure was observed in the valence band and on the Ba 3d, Ti 2p and O 1s core levels of BTO. Polarization-dependent surface adsorption was observed. A simple electrostatic model based on net surface charge is not sufficient to explain the observed modifications in the electronic levels. Copyright © 2010 John Wiley & Sons, Ltd.