Berlin 2015 – scientific programme
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DS: Fachverband Dünne Schichten
DS 39: Poster Session II
DS 39.3: Poster
Thursday, March 19, 2015, 16:00–18:30, Poster F
Preparation and Characterisation of Crystalline C60 and Pentacene Interfaces — •Andrea Karthäuser, Tobias Breuer, and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, Renthof 7, D-35032 Marburg, Germany
Their tunable electronic properties as well as their high photon cross-sections have resulted in increased research efforts in organic semiconductors. However, the complex nature of their interface characteristics concering the correlation between structural and electronic properties, has not yet been entirely elucidated, mostly due to the lack of appropriate model systems. Here we report on the preparation of such a model system of the donor-acceptor pair Pentacene (PEN, C22H14) and Buckminster-Fullerene (C60). Two strikingly different interfaces can be realised between these two compounds, due to their different molecular geometry, which have been theoretically predicted to strongly influence the stability of the interface formation [1] and the electronic properties [2]. Depositing C60 on upright oriented PEN grown on SiO2, causes pronounced step decoration and yields non-crystalline C60 adlayers [3]. Here we reserved the system and deposited PEN onto single crystalline C60 films that were grown on NaCl(100). The resulting morphology and molecular orientation have been analysed by AFM, XRD and - after successfully transferring the films to conducting substrates - also by NEXAFS spectroscopy.
[1] Fu, Y. T. et al. Adv. Mater. (2013), 25, 878. [2] Yi, Y. P. et al. J. Am. Chem. Soc. (2009), 131, 15777. [3] Breuer, T. et al. ACS Appl. Mater. Interfaces (2013), 5, 9740.