SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Organic Molecules on Inorganic Substrates III: Adsorption and Growth I
O 28.3: Vortrag
Dienstag, 28. März 2023, 11:00–11:15, CHE 89
Morphology and luminescence of rubrene nanocrystals: a road to tailor nanoplatelets — •Moha Naeimi, Katharina Engster, Christian Völkner, Regina Lange, Sylvia Speller, and Ingo Barke — University of Rostock, Institute of physics, Rostock, Germany
Rubrene (C42H28 5,6,11,12-tetraphenyltetracene) single crystals with a few monolayers had been reported to have high charge mobility of 43 cm2/Vs [1] and singlet-fission dynamics [2] which are promising properties for the application of excitons for energy transfer or information processing. We aim for the investigation of the spatial distribution of excitons in molecular assemblies on surfaces, requiring thin films or flat nanocrystals. In the present work, we report on the preparation of rubrene platelets by various methods from simple spin-coating to thermal evaporation and broad growth conditions, followed by a high-rate post-annealing temperature treatment on different types of substrates [3]. Ranging from 10 nm to 150 nm, we show that the thickness of rubrene platelets is widely dependent on the rate and time of temperature treatment as well as on the rubrene coverage on the surface. Moreover, we discuss thermal stability and photo-degradation for different morphologies.
[1] A. Saeki. et al., Adv. Mater. 20, 2008, 920-923
[2] Lin Ma. et al., Phys. Chem. Chem. Phys. 14, 2012, 8307-8312
[3] Hyeok Moo Lee. at al., Org. Electron. 12, 2011, 1446-1453