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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.