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O: Fachverband Oberflächenphysik

O 44: Metal Substrates: Structure, Epitaxy and Growth

O 44.2: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

Surface Chemistry and Growth of SnCl₂Pc on Ag(111) — •Christian Zwick, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany

Tin(IV) phthalocyanine dichloride (SnCl₂Pc) is an n-type semiconductor already used in organic field-effect transistors [1], but still very little is known about the actual interface formation when SnCl₂Pc is deposited onto a substrate. This molecule is not planar owing to its two protruding Cl atoms. These are known to act as spacers in bulk crystal formation, and thereby significantly influence the intermolecular orbital overlap. On the other hand, Cl is known to be highly reactive in contact with certain metals, for example Ag. Hence, these two opposing effects draw attention towards the adsorption behavior of SnCl₂Pc on a silver substrate. Here we report on the observed surface chemistry, the partial dechlorination of SnCl₂Pc on Ag(111), and its role concerning the interface formation on Ag(111). Using in situ differential reflectance spectroscopy (DRS), low-energy electron diffraction (LEED) and low-temperature scanning tunneling microscopy (STM), we investigate the optical and structural properties of SnCl₂Pc/Ag(111) for effective layer thicknesses up to 2 monolayers.
SK. Md. Obaidulla et al., Appl. Phys. Lett. 104, 213302 (2014).