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O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.10: Talk
Monday, March 31, 2014, 12:45–13:00, TRE Phy
STM Induced Light Emission from Organic Molecules on Surfaces — •Maren C. Cottin, Ebru Özen, Tobias Roos, Doris Steeger, Detlef Utzat, Willy Platz, Rolf Möller, and Christian A. Bobisch — Faculty of Physics, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47048 Duisburg, Germany
Most STM techniques rely on the elastic part of the tunneling current. In contrast, STM induced light emission (STM-LE) experiments analyze the excitation mechanisms in the tip sample junction due to inelastic tunneling processes. Laterally resolved photon maps reveal the specific sites of excitation [1,2], while spectra of the overall light intensity as a function of bias voltage as well as energy resolved spectra of the emitted light can be used to characterize and identify the involved radiative decay channels [3]. Here, we use STM-LE to characterize various organic/metal interfaces. E.g., we present intermolecularly resolved photon maps of the archetype molecule C60 on different substrates. From energy resolved spectra of the emitted light we try to identify the involved decay channels.
[1] R. Berndt et al., Science 262, 1425 (1993).
[2] C. Chen et al., Phys. Rev. Lett. 105, 217402 (2010).
[3] R. Berndt et al., Ultramicroscopy 42−44, 355 (1992).