Regensburg 2016 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 55: Organic Thin Films III
DS 55.8: Vortrag
Freitag, 11. März 2016, 11:30–11:45, H8
Controlled UHV growth of organic-inorganic hybrid structures: Conjugated molecules on ZnO — •Mino Sparenberg1, Anton Zykov1, Jörg Megow1, Viola Schmidt1, Yves Garmshausen2, Stefan Hecht2, Stefan Kowarik1, and Sylke Blumstengel1 — 1Humboldt Universität zu Berlin, Institut für Physik — 2Humboldt Universität zu Berlin, Institut für Chemie
For the fabrication of inorganic-organic hybrid structures an understanding of the interaction at the interface is crucial. Therefore the growth of thin organic films is conducted in an all-UHV MBE system and analysed in situ via AFM and differential reflectance spectroscopy (DRS). The inorganic semiconductor examined here is epitaxially grown ZnO. Studied is the influence of chemical tuning on the growth process using the organic molecule para-sexiphenyl (6P). As promising candidate for usage in opto-electronic devices controlling the growth properties is critical [Phys. Rev. B, 2008, 77, 085323]. For this chemical tuning is used, as done for 6P by partial fluorination. We show that due to different terminal fluorination of 6P the growth mode could be drastically changed. Whereas symmetric fluorinated 6P-F4 shows a smooth layer-by-layer growth [PCCP, 2014, 16, 26084], asymmetric 6P-F2 possesses a static dipolar moment making it sensitive to the surface of ZnO. Furthermore the growth of PTCDI and NTCDA were investigated via DRS where the evolution of thin PTCDA films from monomer to aggregate was observed and successfully theoretically described [J. Phys. Chem. C 2015, 119, 5747] whereby for NTCDA the resonant overlap at the edge of ZnO is observed.