Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 40: Metal substrates: Adsorption of organic / bio molecules V

O 40.7: Talk

Wednesday, March 16, 2011, 12:45–13:00, PHY C213

STM/STS-Study of Spiro-DPO molecules on Au(111) up to two monolayers coverage — •Michael Waelsch¹, Benjamin Herath¹, Tobat P. Saragi², Josef Salbeck², and René Matzdorf¹ — ¹AG Experimentalphysik 2, Oberflächenphysik — ²AG Makromolekulare Chemie und Molekulare Materialien, Universität Kassel

In the Spiro-DPO-molecule an arylamine group (acceptor) is linked to an oxadiazole group (donor) via a spiro-C-atom. Coverages of 1/10...2 ML of the organic semiconductor Spiro-DPO have been investigated with STM/STS at 4.7 K. Large islands of homochiral molecules were observed, whose internal double-row structure is oriented in an ± 10^∘ angle relative to the Au-crystal axes. Spatially resolved tunneling spectra show different LUMO-energies of the donor/acceptor groups of one molecule.