Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 106: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales IV

O 106.8: Vortrag

Freitag, 22. März 2024, 12:30–12:45, MA 041

Hot luminescence from single-molecule chromophores electrically and mechanically self-decoupled by tripodal scaffolds — •Vibhuti Rai^1,2, Nico Balzer³, Gabriel Derenbach¹, Christof Holzer⁴, Marcel Mayor³, Wulf Wulfhekel¹, Lukas Gerhard¹, and Michal Valášek³ — ¹Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstraße 12, 76131 Karlsruhe, Germany — ²Freie Universität Berlin, Department of Physics, Arnimallee 14,14195 Berlin, Germany — ³Institute of Nanotechnology, Karlsruhe Institute of Technology, Kaiserstraße 12, 76131 Karlsruhe, Germany — ⁴Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, Kaiserstraße 12, 76131 Karlsruhe, Germany

Control over the electrical contact to an individual molecule is one of the biggest challenges in molecular optoelectronics. Chemical route of anchoring individual chromophores via extended tripodal scaffolds is a promising approach for efficient electrical decoupling from metallic leads [1]. Here, we show that NDI chromophores coupled to a gold substrate via a tripodal scaffold and via a vacuum barrier to the tip of a scanning tunnelling microscope enable spectrally and spatially resolved electroluminescence. We show that specific vibrons of the chromophore which are mechanically decoupled from the substrate give rise to hot-luminescence (HL) bands. Vibrons which are coupled to the substrate do not show HL.

[1] Rai, V. et al. Phys. Rev. Lett. 130, 036201 (2023).

Keywords: Scanning Tunnelling Microscopy; Nanoplasmonics; Light-matter interaction; Single-molecule electroluminescence; self-assembly