Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Oxide and Insulator Surfaces: Structure, Epitaxy and Growth
O 59.8: Vortrag
Mittwoch, 18. März 2015, 16:45–17:00, MA 042
Ordered Indium and Iron Adatoms on the Reduced In2O3(111) Surface — •Margareta Wagner1, Peter Lackner1, Steffen Seiler2, Bernd Meyer2, Lynn A. Boatner3, Michael Schmid1, and Ulrike Diebold1 — 1Institut für Angewandte Physik, Technische Universität Wien, Wiedner Hauptstrasse 8-10/134, 1040 Wien, Österreich — 2Interdisciplinary Center for Molecular Materials and Computer-Chemistry-Center Friedrich-Alexander-Universität Erlangen-Nürnberg, Nägelsbachstrasse 25, 91052 Erlangen, Deutschland — 3Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Indium oxide is one of the most important TCOs and commonly used as a contact material in many devices. Recently, In2O3 single crystals, prerequisite for fundamental surface studies, have become available.
The In2O3(111) surface can be transformed from a bulk-terminated surface to one that is covered by single indium adatoms. The transformation and the intermediate stages were followed with Scanning Tunneling Microscopy (STM) and Density Functional Theory (DFT). DFT supports the formation of a stable array made of indium adatoms, which is favored over vacancy formation at the given oxygen chemical potential during reduction. The formation of an ordered adatom array is different from any known response of an oxide surface to chemical reduction. Also iron atoms deposited on the oxidized surface arrange as single adatoms in the same (1x1) superstructure. The adatom-covered and oxidized In2O3(111) surfaces are expected to exhibit very different chemical and electronic properties.