Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Poster Wednesday: Organic Molecules on Inorganic Surfaces
O 69.3: Poster
Wednesday, April 3, 2019, 17:45–20:00, Poster B2
Investigation of side chain substituted quaterthiophenes on pristine and C60-covered Ag(111) — •Jari Domke, Falko Sojka, Marco Gruenewald, Christian Zwick, Roman Forker, and Torsten Fritz — Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany
Side chain substituted dicyanovinyl quaterthiophenes (DCV4T-Et2) have been of interest for their application as absorber molecules in small molecule organic solar cells [1]. We investigate thin films of DCV4T-Et2 on Ag(111) as well as on C60 monolayers on Ag(111). Structural characterization of the films is carried out by means of distortion corrected low-energy electron diffraction (MCP-LEED) [2] and low-temperature scanning tunneling microscopy (LT-STM), optical characterization by differential reflectance spectroscopy (DRS) [3] and Photoluminescence (PL). We find that DCV4T-Et2 forms highly ordered structures on Ag(111). The optical properties depend on the layer thickness, most likely due to formation of aggregates.
[1] O. Guskova et al., J. Phys. Chem. C 117 (33), 17285-17293 (2013).
[2] F. Sojka et al., Rev. Sci. Instrum. 84, 015111 (2013).
[3] R. Forker et al., Annu. Rep. Prog. Chem., Sect. C: Phys. Chem. 108, 34-68 (2012).