Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 73: Organic Molecules on Inorganic Substrates V: Adsorption, Growth and Networks

O 73.7: Talk

Wednesday, March 18, 2020, 16:45–17:00, TRE Phy

Polymorphism of 6,13-Pentacenequinone on Ag(111) in the monolayer regime — •Jari Domke, Falko Sojka, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany

Pentacene and its derivatives have been studied extensively and with great interest in the last decades due to their potential and actual application in organic electronics. For devices utilizing those molecules an understanding of the layer growth on a distinct substrate is of fundamental importance, as this can be strongly affected by introducing functional groups – for example – to promote hydrogen bonds.

We structurally investigated 6,13-pentacenequinone (P2O) on Ag(111) in monolayer and sub-monolayer regimes using distortion-corrected low-energy electron diffraction (LEED) and low-temperature scanning tunneling microscopy (STM). Accordingly, several coverage-dependent structures were found, most of them exhibiting an on-line epitaxy. Additionally, a phase consisting of many line-shaped nano domains was observed for annealed samples in STM, yielding a consistent model for LEED patterns that would otherwise suggest a commensurate structure incompatible with the molecular size of P2O.