Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 80: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales II

O 80.3: Vortrag

Donnerstag, 21. März 2024, 11:00–11:15, MA 041

Structure and optical characterisation of Dibenzoterrylene on Au(111) and C₆₀ — •Andreas Reutter^1,2, Yannis Hilgers^1,2, Franziska Hirt^2,3, Stefan Kück^2,3, Markus Etzkorn^1,2, and Uta Schlickum^1,2 — ¹Institut für Angewandte Physik, TU Braunschweig — ²Laboratory for Emerging Nanometrology, TU Braunschweig — ³Physikalisch-Technische Bundesanstalt, Braunschweig

Polycyclic aromatic hydrocarbons are promising candidates for molecule based single photon sources since they offer high brightness and narrow spectral emission lines. One interesting candidate is dibenzoterrylene (DBT, C₃₈H₂₀) which has recently been investigated in anthracene nanocrystals. However, anthracene tends to sublime at room temperature and the fabrication process has a low reproducibility. We have grown DBT on Au(111) and in C₆₀ buffer layers in vacuum with organic molecular beam epitaxy. Using confocal laser scanning microscopy, we find photon emission from DBT clusters when embedded in a C₆₀ Matrix. In addition, we have investigated the structure with low-temperature STM. For sub-monolayer coverage, DBT molecules self-assembly on the well-known Herringbone reconstruction on the Au(111) surface. Surprisingly, the DBT molecules prefer the fcc over the hcp areas of the herringbones in contrast to other molecules. We plan to fabricate DBT-C₆₀ sandwich samples with individual DBT molecules implemented in the interlayer and to study their optical properties regarding line width and single photon characteristic of this system.

Keywords: Single Photons; Single molecules; STML; Confocal Laser Scanning Microscopy; DBT