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Growth and surface properties of epitaxial SnO2

Rachut, Karsten and Körber, Christoph and Broetz, Joachim and Klein, Andreas (2014):
Growth and surface properties of epitaxial SnO2.
In: physica status solidi (a), WILEY-VCH Verlag GmbH & Co. KGaA, pp. 1997-2004, 211, (9), ISSN 18626300,
[Online-Edition: http://dx.doi.org/10.1002/pssa.201330367],
[Article]

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.

Item Type: Article
Erschienen: 2014
Creators: Rachut, Karsten and Körber, Christoph and Broetz, Joachim and Klein, Andreas
Title: Growth and surface properties of epitaxial SnO2
Language: English
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.

Journal or Publication Title: physica status solidi (a)
Volume: 211
Number: 9
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA
Uncontrolled Keywords: epitaxy; ionization potential; SnO2; surfaces; work function
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
11 Department of Materials and Earth Sciences > Material Science > Structure Research
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties > Subproject D3: Function and fatigue of oxide electrodes in organic light emitting diodes
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 15 Dec 2014 11:50
Official URL: http://dx.doi.org/10.1002/pssa.201330367
Additional Information:

SFB 595 D3

Dedicated to Wolfram Jaegermann on the occasion of his 60th birthday

Identification Number: doi:10.1002/pssa.201330367
Funders: 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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