Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Postersession II

DS 44.21: Poster

Donnerstag, 23. März 2017, 17:00–19:00, P1C

In-depth analysis of nanomorphology in thin films of 6,13-dihydro-6,13-diazapentacene — •Xiaoyan Du¹, Lisa Müller², Nicolai Burzlaff², and Rainer H. Fink¹ — ¹Physical Chemistry 2 and ICMM Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Egerlandstr. 3, 91058 Erlangen, Germany — ²Inorganic Chemistry, Department of Chemistry and Pharmacy Friedrich-Alexander-University Erlangen-Nuremberg Egerlandstr. 1, 91058 Erlangen, Germany

6,13-Dihydro-6,13-diazapentacene (DHDAP) is one of the important pentacene derivatives due to its ability to be easily derivatized, or its environmental stability and its solubility. The performance of organic field-effect transistors (OFETs) based on DHDAP has been found to be extremely sensitive to the substrates nature and temperature, which induces different polymorphs. We employ several complementary microspectroscopic probes to investigate the structure of thermally evaporated films evaporated at different conditions. Detailed analysis of atomic force microscopy (AFM), scanning transmission X-ray microscopy (STXM) and resonant soft X-ray scattering (RSoXS) reveals the dependence of the crystalline domain size on the film preparation conditions. Angle-resolved near edge x-ray absorption fine structure (NEXAFS) spectroscopy sheds lights on the molecular orientation of the molecules close to the substrates. Thus, the structure-property relations offer further insights into the transport properties of the respective OFETs devices. This work is funded by the DFG within GRK 1896.