Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.36: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster B
Self-assembly of thienothiophene based molecules and C60 on Au(111) — •Julia Läger1, Christian Lotze1, Nils Krane1, Lei Zhang2, Alejandro L. Briseno2, and Katharina J. Franke1 — 1Freie Universität Berlin, Department of Physics, Berlin, Germany — 2University of Massachusetts, Department of Polymer Science and Engineering, Amherst, USA
Thiophene-containing molecules and fullerenes can form a donor-acceptor heterojunction for use in organic solar cells. The charge transfer between the two compounds and thus the efficiency depends on the interface of the junction and the morphology of the molecules on the surface.
Submonolayer of BTTT were adsorbed on Au(111). We used a combined LT-STM and AFM to examine the resulting structure. We observed two ordered, planar phases and molecular configurations: a windmill-like arrangement with interdigitation of the dodecyl chains on areas with high coverage, and a parallel alignment with lower molecular density and closer proximity of the thiophene rings. The major contribution to the self-assembly is likely to be van der Waals interaction between the alkyl chains. Two isomers with different configurations of the sulfur atoms could be identified in STM and AFM images. Subsequently, we deposited C60 on the submonolayer preparation and find islands on clean Au(111) as well as on the BTTT islands.