Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 42: Poster: Organic-Inorganic Hybrid Systems and Organic Films

O 42.20: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

On the inner structure of porphyrin nanoaggregates revealed by luminescence polarization — •Jannis Becker, Mohammadreza Bahrami, Sven Kraft, Christian Völkner, Kevin Oldenburg, Ingo Barke, and Sylvia Speller — University of Rostock, Institute of Physics, 18059 Rostock, Germany

For studying exciton pathways in molecule nanostructures we prepared copper-based porphyrin aggregates on various surfaces by self-assembly from a solution [1,2]. Apart from the morphology also the inner structure of such aggregates is of interest, particularly for the interpretation of optical and electronic properties in the context of first-principles theory. We address this topic by mapping the luminescence polarization directions of such aggregates. This provides information on the orientation of the transition dipoles and thereby on the orientation of the molecules within the aggregates. We find a pronounced orientation preference for lengthy, tree-like structures, while for more isotropic island morphologies the degree of order is lower. Based on the results we discuss possible structural motifs for the tree-like aggregates.

[1] Hartmann et al., J. Phys. Chem. C 120, 16977 (2016).

[2] Bahrami et al.: Correlative Microscopy of Morphology and Luminescence of Cu porphyrin aggregates, submitted.