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Heteromolecular bilayers on a weakly interacting substrate: Physisorptive bonding and molecular distortions of copper-hexadecafluorophthalocyanine

DOI: 10.1021/acsami.9b22812 DOI Help

Authors: Qi Wang (Universität Tübingen) , Antoni Franco-canellas (Universität Tübingen) , Jiacheng Yang (Soochow University) , Julian Hausch (Universität Tübingen) , Samuel Struzek (Universität Tübingen) , Mengting Chen (Soochow University) , Pardeep K. Thakur (Diamond Light Source) , Alexander Gerlach (Universität Tübingen) , Steffen Duhm (Soochow University) , Frank Schreiber (Universität Tübingen)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Applied Materials & Interfaces

State: Published (Approved)
Published: February 2020
Diamond Proposal Number(s): 19033

Abstract: Heteromolecular bilayers of π-conjugated organic molecules (COM) on metals, considered as model systems for more complex thin film heterostructures, are investigated with respect to their structural and electronic properties. By exploring the influence of the organic-metal interaction strength in bilayer systems, we determine the molecular arrangement in the physisorptive regime for copper-hexadecafluorophthalocyanine (F16CuPc) on Au(111) with intermediate 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.

Journal Keywords: bilayer structure; adsorption behaviour; physisorption; molecular dipole moment; photoelectron spectroscopy; X-ray standing wave measurements

Subject Areas: Physics, Materials, Chemistry

Instruments: I09-Surface and Interface Structural Analysis