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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 28: Organic Molecules on Inorganic Substrates I: Switching and Manipulation

O 28.9: Vortrag

Dienstag, 2. April 2019, 12:30–12:45, H24

High-Resolution Vibronic Spectra of Molecules on Molybdenum Disulfide Allow for Rotamer IdentificationNils Krane1, •Christian Lotze1, Gaël Reecht1, Lei Zhang2, Alejandro L. Briseno2, and Katharina J. Franke11Fachbereich Physik, Freie Universität Berlin — 2Department of Polymer Science and Engineering, University of Massachusetts, USA

Scanning tunneling spectroscopy (STS) is a tool that allows to address individual molecules in a precisely known surrounding. However, it bears the drawback that it requires a conductive substrate. Deposition of organic molecules on a metal substrate leads to strong hybridization of the electronic states. Preservation of the molecular character requires the inclusion of thin band-gapped materials.

Here, we present STS experiments performed on 2,5-bis(3-dodecylthiophen-2-yl)thieno[3,2-b]thiophene (BTTT) molecules adsorbed on a single layer molybdenum disulfide (MoS2) on Au(111). We show that it acts as an effective electronic decoupling layer that exhibits a small electron-phonon coupling strength. Differential conductance spectra of the molecules exhibit a multitude of sharp characteristic peaks, originating from vibronic states of BTTT. These vibronic fingerprints of different molecules allow for an identification of different rotamers. DFT calculations of the molecule in gas phase provide all details for an accurate simulation of the vibronic spectra of both investigated rotamers [1].

Krane, et al., ACS Nano, 2018, 12, 11, 11698-11703

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