Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: Electronic Structure of Surfaces II
O 58.11: Talk
Wednesday, March 18, 2015, 17:30–17:45, MA 041
Manipulating STM induced light emission by organic adlayers — •Maren C. Cottin, Ebru Ekici, Rolf Möller, and Christian A. Bobisch — Faculty of Physics, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47048 Duisburg, Germany
Light emitted from the tip-sample junction of a scanning tunneling microscope (STM) carries information about energy transfer processes at surfaces. We use thin layers of bismuth (Bi) on Cu(111) as a substrate for different archetype organic layers, e.g. C60 and perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA). We find that the maximum photon yield may be enhanced if the tunneling tip is placed above the molecules as compared to the bare Bi/Cu(111)-substrate. In a comprehensive study of the light emission characteristics, we present laterally resolved maps of the overall photon intensity measured together with the surface structure. In addition, measurements of the overall photon intensity as a function of the bias voltage, dI/dV-data and spectra of the emitted light allow us to characterize the role of the molecules in the excitation/light emission process.