Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 80: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales II
O 80.3: Talk
Thursday, March 21, 2024, 11:00–11:15, MA 041
Structure and optical characterisation of Dibenzoterrylene on Au(111) and C60 — •Andreas Reutter1,2, Yannis Hilgers1,2, Franziska Hirt2,3, Stefan Kück2,3, Markus Etzkorn1,2, and Uta Schlickum1,2 — 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