Rachut, Karsten ; Körber, Christoph ; Broetz, Joachim ; Klein, Andreas (2014)
Growth and surface properties of epitaxial SnO2.
In: physica status solidi (a), 211 (9)
doi: 10.1002/pssa.201330367
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The surface potentials of SnO2 films grown epitaxially by magnetron sputtering on TiO2 and Al2O3 substrates with (110), (001), (101), and (100) SnO2 surface orientations are determined using in situ photoelectron spectroscopy. Epitaxial growth is verified using X-ray diffraction and low energy electron diffraction. The emphasis lies on the determination of work functions and ionization potentials of epitaxial SnO2 surfaces. SnO2 films prepared under chemically reducing conditions exhibit work functions φ of 4.25–4.48 eV and ionization potentials IP of 7.54–8.11 eV. It is furthermore demonstrated that a subsequent annealing in oxygen alters the surface dipole, visible through a large increase of ionization potential. This is due to a change of the surface termination from a reduced to a stoichiometric surface which exhibits Sn in the +IV oxidation state. The observed increase of IP varies from 0.48 eV for the (110) SnO2 surface to 1.05 eV for the (101) SnO2 surface.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Rachut, Karsten ; Körber, Christoph ; Broetz, Joachim ; Klein, Andreas |
| Art des Eintrags: | Bibliographie |
| Titel: | Growth and surface properties of epitaxial SnO2 |
| Sprache: | Englisch |
| Publikationsjahr: | September 2014 |
| Verlag: | WILEY-VCH Verlag GmbH & Co. KGaA |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | physica status solidi (a) |
| Jahrgang/Volume einer Zeitschrift: | 211 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.1002/pssa.201330367 |
| Kurzbeschreibung (Abstract): | The surface potentials of SnO2 films grown epitaxially by magnetron sputtering on TiO2 and Al2O3 substrates with (110), (001), (101), and (100) SnO2 surface orientations are determined using in situ photoelectron spectroscopy. Epitaxial growth is verified using X-ray diffraction and low energy electron diffraction. The emphasis lies on the determination of work functions and ionization potentials of epitaxial SnO2 surfaces. SnO2 films prepared under chemically reducing conditions exhibit work functions φ of 4.25–4.48 eV and ionization potentials IP of 7.54–8.11 eV. It is furthermore demonstrated that a subsequent annealing in oxygen alters the surface dipole, visible through a large increase of ionization potential. This is due to a change of the surface termination from a reduced to a stoichiometric surface which exhibits Sn in the +IV oxidation state. The observed increase of IP varies from 0.48 eV for the (110) SnO2 surface to 1.05 eV for the (101) SnO2 surface. |
| Freie Schlagworte: | epitaxy; ionization potential; SnO2; surfaces; work function |
| Zusätzliche Informationen: | SFB 595 D3 Dedicated to Wolfram Jaegermann on the occasion of his 60th birthday |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > D - Bauteileigenschaften DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > D - Bauteileigenschaften > Teilprojekt D3: Funktion und Ermüdung oxidischer Elektroden in organischen Leuchtdioden 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) |
| Hinterlegungsdatum: | 15 Dez 2014 11:50 |
| Letzte Änderung: | 29 Mär 2015 17:17 |
| PPN: | |
| Sponsoren: | This work was supported by the Deutsche Forschungsgemeinschaft (DFG) within the collaborative research center SFB 595 (Electrical Fatigue of Functional Materials) and by the state of Hessen within the LOEWE centre AdRIA. |
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