Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 4: Organic Thin Films I

DS 4.4: Talk

Monday, March 7, 2016, 10:30–10:45, H11

Domain size distribution of PTCDA on KCl(100) determined by SPA-LEED and optical spectroscopy — •Christian Marquardt¹, Alexander Paulheim¹, Alexander Eisfeld², and Moritz Sokolowski¹ — ¹Institut für Physikalische und Theoretische Chemie der Universität Bonn, Wegelerstr. 12, 53115 Bonn, Germany — ²Max-Planck-Institut für Physik komplexer Systeme, Noethnitzer Str. 38, 01187 Dresden, Germany

The organic dye molecule 3,4,9,10-perylenetetracarboxylicacid dianhydride (PTCDA) forms a monolayer with a commensurate (2√2 × 2√2 R45^∘) brickwall structure on the KCl(100) surface. Within this structure, the molecules arrange in a head-to-tail configuration forming two-dimensional J-aggregates with optical properties correlated to the size of the exciton delocalization [1]. Under real growth conditions and at cryogenic temperatures, the exciton delocalization is mainly limited by the size of the PTCDA domains. Here, we present a combined SPA-LEED and optical spectroscopy study, to demonstrate the huge impact of the present domain size distribution on the obtained spectral features in optical fluorescence (FL) and FL excitation spectra. Supported by DFG.
[1] M. Müller et al., J. Chem. Phys. 139 044302 (2013).