Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 86: Poster Session - Organic Molecules on Inorganic Substrates: Electronic, Optical and other Properties II

O 86.9: Poster

Wednesday, March 18, 2020, 18:15–20:00, P2/EG

Structure and Morphology of Tetracene Aggregates on HOPG — •Annika Bergmann, Christian Völkner, Kevin Oldenburg, Ingo Barke, and Sylvia Speller — University of Rostock, Institute of Physics, 18059 Rostock, Germany

Exciton formation in tetracene involves fascinating phenomena such as long-range triplet propagation and singlet fission, and fusion [1]. Our aim is to elucidate the spatially resolved population dynamics and energetics of these processes in tetracene nano- and microstructures at surfaces. Here we present scanning probe (AFM, LT-STM) and fluorescence microscopy data on tetracene aggregates on HOPG prepared by ex-situ deposition from a solution via drop-casting or immersion, as well as in-situ evaporation. For the latter polarization dependent fluorescence reveals highly ordered crystallites, while the structure of ex-situ prepared layers in the monolayer regime is more fragile. Since literature about tetracene on HOPG is scarce we compare the results to studies on pentacene on HOPG [2]. Formation of tetracene mono- and multilayers is discussed with regard to lying-down and standing-up molecular configurations, respectively.

[1] Akselrod et al., Nat. Commun. 5 (2014).
[2] Götzen et al., Phys. Rev. B 81 (2010).