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DS: Fachverband Dünne Schichten
DS 4: Organic Thin Films I
DS 4.7: Vortrag
Montag, 7. März 2016, 11:30–11:45, H11
Evolution of Crystalline C60 Films: Influence of the Subjacent Pentacene Layer — •Andrea Karthäuser, Tobias Breuer, and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, Renthof 7, D-35032 Marburg, Germany
A key process in organic photovoltaic devices is the charge transfer that takes place at the heterojunction between molecular donors and acceptors. In many cases, however, an intermixture of both materials hampers detailed studies of the elementary optoelectronic excitations and their structure interrelation. Here we report on the hetero-growth of Buckminster-Fullerene (C60) films on Pentacene (PEN, C22H14) bottom layers. While C60 deposition on SiO2 yields amorphous films only, crystalline islands are formed when the substrate is precoated with a PEN buffer layer [1]. Using atomic force microscopy in combination with x-ray diffraction we show that the thickness of the PEN buffer layer is decisive for the crystallinity of the resulting C60 films, which can be explained by an interplay of diffusion and nucleation of the impinging C60 molecules.
[1] Itaka K. et. al. Adv. Mater. (2006), 18, 1713