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The Work Function of TiO₂

Kashiwaya, Shun ; Morasch, Jan ; Streibel, Verena ; Toupance, Thierry ; Jaegermann, Wolfram ; Klein, Andreas (2021):
The Work Function of TiO₂. (Publisher's Version)
In: Surfaces, 1 (1), pp. 73-89. MDPI, e-ISSN 2571-9637,
DOI: 10.26083/tuprints-00019796,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: The Work Function of TiO₂
Language: English
Abstract:

Polycrystalline anatase thin films, (001)- and (101)-oriented anatase TiO₂ single crystals and (001)- and (110)-oriented rutile TiO₂ single crystals with various surface treatments were studied by photoelectron spectroscopy to obtain their surface potentials. Regardless of orientations and polymorph, a huge variation of the Fermi level and work function was achieved by varying the surface condition. The most strongly oxidized surfaces are obtained after oxygen plasma treatment with a Fermi level ∼2.6 eV above the valence band maximum and ionization potentials of up to 9.5 eV (work function 7.9 eV). All other treated anatase surfaces exhibit an ionization potential independent of surface condition of 7.96±0.15 eV. The Fermi level positions and the work functions vary by up to 1 eV. The ionization potential of rutile is ∼0.56 eV lower than that of anatase in good agreement with recent band alignment studies.

Journal or Publication Title: Surfaces
Journal volume: 1
Number: 1
Publisher: MDPI
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 29 Oct 2021 12:24
Last Modified: 29 Oct 2021 12:24
DOI: 10.26083/tuprints-00019796
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-197962
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19796
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