Arveux, E. ; Payan, S. ; Maglione, M. ; Klein, Andreas (2010)
Surface segregation in Nb-doped BaTiO3 films.
In: Applied Surface Science, 256 (21)
doi: 10.1016/j.apsusc.2010.03.146
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We have used in situ photoemission spectroscopy to investigate Niobium doping in polycristalline BaTiO3. The valence band maximum position progressively shifts from 2.5 eV for undoped to 2.84 eV for Nb-doped films. Ceramics and single crystal have been investigated for comparison with thin films. Nb-doped BaTiO3 ceramics and Nb-doped SrTiO3 single crystal show higher Fermi level position indicating that our doped films are less conducting regarding their bulk parents. This was confirmed by impedance spectroscopy under variable temperature. Large amount of niobium is clearly observable at surface but the amount of dopant is drastically reduced below the near-surface region, as evidenced by depth profile. Therefore, we provide evidence of surface segregation which would explain the contrasted resistivity values reported in literature for such donor-doped films.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2010 |
| Autor(en): | Arveux, E. ; Payan, S. ; Maglione, M. ; Klein, Andreas |
| Art des Eintrags: | Bibliographie |
| Titel: | Surface segregation in Nb-doped BaTiO3 films |
| Sprache: | Englisch |
| Publikationsjahr: | August 2010 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Applied Surface Science |
| Jahrgang/Volume einer Zeitschrift: | 256 |
| (Heft-)Nummer: | 21 |
| DOI: | 10.1016/j.apsusc.2010.03.146 |
| Kurzbeschreibung (Abstract): | We have used in situ photoemission spectroscopy to investigate Niobium doping in polycristalline BaTiO3. The valence band maximum position progressively shifts from 2.5 eV for undoped to 2.84 eV for Nb-doped films. Ceramics and single crystal have been investigated for comparison with thin films. Nb-doped BaTiO3 ceramics and Nb-doped SrTiO3 single crystal show higher Fermi level position indicating that our doped films are less conducting regarding their bulk parents. This was confirmed by impedance spectroscopy under variable temperature. Large amount of niobium is clearly observable at surface but the amount of dopant is drastically reduced below the near-surface region, as evidenced by depth profile. Therefore, we provide evidence of surface segregation which would explain the contrasted resistivity values reported in literature for such donor-doped films. |
| Freie Schlagworte: | BaTiO3 and titanates; Films; PTCR; Segregation; Surfaces; XPS |
| Zusätzliche Informationen: | SFB 595 B7 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > B - Charakterisierung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > B - Charakterisierung > Teilprojekt B7:Polarisation und Ladung in elektrisch ermüdeten Ferroelektrika DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) |
| Hinterlegungsdatum: | 05 Okt 2011 09:17 |
| Letzte Änderung: | 25 Mär 2015 22:12 |
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