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O: Fachverband Oberflächenphysik
O 6: Organic Molecules on Inorganic Substrates I: Electronic, Optical and other Properties
O 6.4: Vortrag
Montag, 16. März 2020, 11:30–11:45, REC C 213
Dodecacene generated on Surface: Re-opening of the Energy Gap — Tim Kühne1, Frank Eisenhut1, Fátima Garcia3, Saleta Fernández3, Enrique Guitián3, Dolores Pérez3, Georges Trinquier5, Gianaurelio Cuniberti2, Christian Joachim4, Diego Peña3, and •Francesca Moresco1 — 1Center for Advancing Electronics Dresden, TU Dresden, Germany — 2Institute for Materials Science, TU Dresden, Germany — 3Leibniz Institute of Polymer Research, Dresden, Germany — 4GNS & MANA Satellite, CEMES, CNRS, Toulouse Cedex, France — 5Laboratoire de Chimie et Physique Quanties, Université Paul-Sabatier, Toulouse Cedex, France
The acene series represents a unique model system to investigate the intriguing electronic properties of extended π electron structures in the one-dimensional limit, which are important for applications in electronics and spintronics and for the fundamental understanding of electronic transport. Here we present the on-surface generation of the longest acene obtained so far: Dodecacene. Scanning tunneling spectroscopy gives access to the energy position and spatial distribution of its electronic states on the Au(111) surface. We observe that, after a progressive closing of the gap and a stabilization to about 1 eV at the length of decacene and undecacene, the energy gap of dodecacene unexpectedly increases to 1.4 eV. Considering the acene series as an exemplary general case, we discuss the evolution with length of the single tunneling resonances in comparison with ionization energy, electronic affinity, and optical gap.