Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 35: Organic thin films III: Monolayers and crystals

DS 35.3: Vortrag

Donnerstag, 29. März 2012, 18:15–18:30, H 2032

A systematic study on fluorination: Rubrene and its fluorinated derivates — •Falk Anger1, Evelyn Adamski1, Katharina Broch1, Alexander Gerlach1, Toshiyasu Suzuki2, and Frank Schreiber11Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen — 2Institute for Molecular Science, Myodaiji, Okazaki 444-8787, Japan

A promising way to modify the electronic levels of organic semiconductors is partial or complete fluorination. Rubrene (C42H28) has been shown to be a suitable semiconductor for applications, for which numerous experimental efforts have been done. In this study, we present thin films of partly (C42H14F14) and completely (C42F28) fluorinated rubrene. For the first time we investigated thin films of these materials grown on a native SiO2 substrate using optical spectroscopy, complementary X-ray reflectivity and AFM. The materials grow to a large extent amorphously and exhibit a smooth surface. However, depending on the growth parameters the molecules can form ordered, dendritic structures that extend on a micrometer scale. The variation of the HOMO-LUMO transition with fluorination is discussed.
[1] M. Kytka et al., J. Chem. Phys. 130, 214507 (2009)
[2] S. Kowarik et al., Phys. Chem. Chem. Phys. 8, 1834-1836 (2006)

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