Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 64: Organic Molecules on Inorganic Substrates IV: Adsorption, Growth and Networks
O 64.7: Talk
Wednesday, March 18, 2020, 12:00–12:15, TRE Phy
Heteromolecular bilayers on a weakly interacting substrate: Interactions and molecular distortions of F16CuPc — •Qi Wang1, Antoni Franco-Cañellas1, Jiacheng Yang2, Julian Hausch1, Samuel Struzek1, Mengting Chen2, Pardeep Kumar Thakur3, Alexander Gerlach1, Steffen Duhm2, and Frank Schreiber1 — 1Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany — 2Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, People's Republic of China — 3Diamond Light Source, Harwell Science and Innovation Campus, OX11 0DE Oxfordshire, United Kingdom
Heteromolecular bilayers of π-conjugated organic molecules (COM) on metals, which are considered as model systems for more complex thin film heterostructures, are investigated with respect to their structural and electronic properties [1]. By exploring the influence of the organic-metal interaction strength in such bilayer systems, we determine the molecular arrangement in the physisorptive regime for copper-hexadecafluorophthalocyanine (F16CuPc) on Au(111) with template layers of 5,7,12,14-pentacenetetrone (P4O) and perylene-3,4,9,10-tetracarboxylic diimide (PTCDI). Using the X-ray standing wave (XSW) technique to distinguish the different molecular layers, we show that these two bilayers are ordered following their deposition sequence. Surprisingly, F16CuPc as the second layer within the heterostructures exhibits an inverted intramolecular distortion compared to its monolayer structure.
[1] Q. Wang, et. al., J. Phys. Chem. C. (2018) 122, 9480-9490.