Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Focus Session: Functional Molecules at Surfaces II

O 41.8: Vortrag

Dienstag, 17. März 2020, 12:45–13:00, TRE Ma

Electronic Structure of a prototypical organic-inorganic interface: CuPc on In2O3(111) — •Matthias A. Blatnik1, Peter Jacobson2, Michael Schmid1, Jan Čechal3, Ulrike Diebold1, and Margareta Wagner1,31Institute of Applied Physics, TU Wien, Wien, Austria — 2School of Mathematics and Physics, University of Queensland, St. Lucia, Australia — 3CEITEC, Brno University of Technology, Brno, Czech Republic

Indium oxide (In2O3) is a ubiquitous material in OLEDs and photovoltaics due to an ideally matched optical transmission window and metallic conduction at room temperature. When In2O3 is paired with organic materials, a nearly universal fabrication step is the introduction of a thin organic buffer layer to improve the charge injection efficiency from In2O3 to the organic active layers. Using a combination of STM, AFM and local spectroscopy (STS), we probe the adsorption structure and density of states at the prototypical copper phthalocyanine (CuPc) - In2O3 interface. Two surface terminations were examined, the 1×1 oxidized surface and the 1×1 hydroxylated surface. Differential conductance (dI/dV) measurements reveal the energetic positions of the HOMO and LUMO states which are critical for improving charge injection. STM/AFM imaging reveals single molecules adsorb in a flat, slightly tilted geometry in three symmetry-equivalent orientations. Increasing the coverage leads to a (densely packed) 1D chains oriented along the <110> directions. Finally, a (2×2) superstructure with a building block consisting of three CuPc molecules is formed.

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