Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 17: Poster Monday: Organic Molecules at Surfaces 1

O 17.4: Poster

Monday, September 5, 2022, 18:00–20:00, P4

Single-domain molecular layers on Ag (110) — •Ravi Priya, Weishan Wu, and Peter Jakob — Department of Physics, Philipps-Universität Marburg, Germany

Single domain molecular layers have been explored on the non-hexagonal Ag(110) substrate. The absence of rotational domains for fcc (110) metal substrates allows for growing layers with uniform azimuthal orientation of deposited molecules. In our study we have investigated various molecules and configurations that may form single domain molecular layers (including mirror domains). Specifically, PTCDA, NTCDA, phthalocyanines (CuPc, SnPc, TiOPc) and regio-selectively substituted pentacene species (pentacene, pentacene-quinone, pentacene-tetrone, quinacridone) were deposited and examined in terms of their structure using SPA-LEED, and their vibrational signature using IR - spectroscopy. Among them, PTCDA, NTCDA and pentacene have been found to form single domain structures. In the case of PTCDA two prominent phases, the brick-wall (BW) and the herringbone (HB) phases exist, and they are readily distinguished not only by their LEED patterns but also from their vibrational signatures. Another finding refers to the increased molecule - metal interaction on Ag (110) vs. Ag (111) that leads to an extra energy (down)shift of the LUMO, thereby having a significant impact on interfacial dynamic charge transfer (IDCT) of vibrational modes [1].

[1] P. Jakob, S. Thussing, Phys. Rev. Lett. 126 (2021) 116801, DOI:10.1103/PhysRevLett.126.116801