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O: Fachverband Oberflächenphysik
O 47: Poster Session IV: Organic molecules on inorganic substrates: networks and overlayers
O 47.4: Poster
Tuesday, March 2, 2021, 13:30–15:30, P
Functional 1D template to drive the assembly and alignment of polycyclic molecules — Valeria Chesnyak1,2, •Marc G Cuxart1, Knud Seufert1, and Willi Auwärter1 — 1Physics Department E20, Technical University of Munich, Garching, Germany — 2IOM-CNR Laboratorio TASC, Trieste, Italy
Two-dimensional (2D) materials grown on metal substrates constitute excellent platforms to engineer the properties of organic molecules and molecular arrays [1,2]. Moiré superstructures emerging from the combination of distinct symmetries and periodicities of metal surface and 2D layer can guide the self-assembly of molecules, while the nature of the 2D layers and their interfacial properties determine the electronic (de)coupling between molecules and metal.
Here we present the formation of a one-dimensional (1D) template resulting from the growth of a 3-fold symmetric hexagonal boron nitride (hBN) layer on a 4-fold symmetric Ir(100) surface. Its functionality is probed by subsequent deposition of pentacene molecules and comprehensive characterization by STM, STS, LEED and XPS measurements. This reveals a linear alignment of individual molecules, shows that the templating functionality originates due to a 1D modulation of the work function, and indicates an electronic decoupling of the molecules from the metal. This system represents a suitable 1D template that provides prospect for the study of arrays of aligned molecules and other low-dimensional nanostructures.
[1] W. Auwärter, Surf. Sci. Rep. 74(1) (2019)
[2] A. Kumar et al., Nanotechnology 28(8) (2017)