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Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 17: Poster Monday: Organic Molecules at Surfaces 1

O 17.9: Poster

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

Growth of organic crystals on nanoparticle precovered surfaces studied by PEEM — •Katharina Engster1, Jörg Heller1, Thorsten Wagner2, Sylvia Speller1, and Ingo Barke11University of Rostock, Institute of Physics, 18059 Rostock, Germany — 2Johannes Kepler University, Institute of Experimental Physics, 4040 Linz, Austria

Nanostructures can be used as plasmonic light sources [1] for local generation of excitons in organic semiconductors. This is a promising pathway to transfer energy in molecular aggregates from a defined starting point over longer distances via exciton propagation. In order to establish a suitable geometry of such a hybrid system, we are interested in the role of metallic clusters during subsequent molecular growth. Mass - selected silver nanoparticles are produced in a gas - phase cluster source and deposited onto a pristine HOPG surface. Afterwards, we use in - situ photoemission electron microscopy (PEEM) to monitor the physical vapour deposition of copper phthalocyanine (CuPc) molecules [2,3] on such surfaces. We observe a Stranski-Krastanov growth during deposition of CuPc and post - deposition further morphology changes of the nanocrystallites.

[1] K. Oldenburg et al., J. Phys. Chem. C 123, 1379 (2019).
[2] Y.-C. Chiu et al., Cryst. Res. Technol. 46, 295 (2011).
[3] T. Wagner et al., Ultramicroscopy 233, 113427 (2022).

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