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Surface states, surface potentials, and segregation at surfaces of tin-doped In₂O₃

Gassenbauer, Y. ; Schafranek, R. ; Klein, Andreas ; Zafeiratos, S. ; Hävecker, M. ; Knop-Gericke, A. ; Schlögl, R. (2022):
Surface states, surface potentials, and segregation at surfaces of tin-doped In₂O₃. (Publisher's Version)
In: Physical Review B, 73 (24), American Physical Society, ISSN 2469-9950, e-ISSN 2469-9969,
DOI: 10.26083/tuprints-00021180,

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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Surface states, surface potentials, and segregation at surfaces of tin-doped In₂O₃
Language: English

Surfaces of In₂O₃ and tin-doped In₂O₃ (ITO) were investigated using photoelectron spectroscopy. Parts of the measurements were carried out directly after thin film preparation by magnetron sputtering without breaking vacuum. In addition samples were measured during exposure to oxidizing and reducing gases at pressures of up to 100Pa using synchrotron radiation from the BESSY II storage ring. Reproducible changes of binding energies with temperature and atmosphere are observed, which are attributed to changes of the surface Fermi level position. We present evidence that the Fermi edge emission observed at ITO surfaces is due to metallic surface states rather than to filled conduction band states. The observed variation of the Fermi level position at the ITO surface with experimental conditions is accompanied by a large apparent variation of the core level to valence band maximum binding energy difference as a result of core-hole screening by the free carriers in the surface states. In addition segregation of Sn to the surface is driven by the surface potential gradient. At elevated temperatures the surface Sn concentration reproducibly changes with exposure to different environments and shows a correlation with the Fermi level position.

Journal or Publication Title: Physical Review B
Volume of the journal: 73
Issue Number: 24
Place of Publication: Darmstadt
Publisher: American Physical Society
Collation: 11 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
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
Date Deposited: 22 Apr 2022 11:06
Last Modified: 09 Feb 2023 10:35
DOI: 10.26083/tuprints-00021180
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-211803
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21180
PPN: 504465007
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