Berlin 2018 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.71: Poster

Dienstag, 13. März 2018, 18:15–20:15, Poster B

Hexacene - Thin film studies on Au(110) with x-ray spectroscopies — •Peter Grüninger^1,2, David Balle¹, Reimer Karstens¹, Heiko Peisert¹ und Holger F. Bettinger² — ¹Institute of Physical and Theoretical Chemistry, University of Tübingen, Germany — ²Institute of Organic Chemistry, University of Tübingen, Germany

Acenes are an important class of polycyclic aromatic hydrocarbons. However molecules larger than pentacene, a well-known material for organic electronics, are difficult to handle due to their low solubility and high reactivity. Here, we focus on the synthesis and thin film properties of the six-ringed hexacene. Although hexacene could be isolated in the bulk many years ago, the preparation of well-defined thin films remains a challenge. After synthesis of hexacene via modified Meerwein-Ponndorf-Verley reduction of hexacene-6,15-quinone, we successfully evaporated hexacene on Au(110) for the first time. We studied the electronic properties and the molecular orientation using x-ray absorption and photoemission spectroscopy (XAS, PES). The occupied and unoccupied structure is compared to pentacene. The orientation of hexacene in the monolayer range was almost flat lying, whereas larger tilt angles to the surface were found in thin films.