Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Plasmonics and nanooptics III
O 64.4: Vortrag
Donnerstag, 29. März 2012, 11:15–11:30, MA 005
Light Emission Mediated By A Lifted Conjugated Polymer — •Jingcheng Li1, Gunnar Schulze1, Luz M. Ballesteros2, Anna Strozecka1, Robin Schürmann1, Katharina J. Franke1, and Jose I. Pascual1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany — 2Departamento de Química Física, Facultad de Ciencias, Universidad de Zaragoza, 50009 Spain
In molecular junctions, the coupling between transporting electrons and molecular vibrations can lead to molecular heating. Understanding and controlling the heat generation and dissipation are essential for future molecular electronics. In this project, combined with scanning tunneling microscope (STM) light emission, we explored the mechanism of molecular heating in the junction. The STM tip was used to contact a single conjugated polymer and lift it from surface to form molecular junction. Light emission induced by tunneling electrons through the molecular junction was collected. After removing the plasmon background, the strong coupling between electrons and molecular vibrations is uncovered. Black body radiation theory is used to determine the temperature of polymer chains.