Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 111: Nanostructures at Surfaces: Molecular Systems III
O 111.6: Talk
Friday, March 24, 2017, 11:45–12:00, REC/PHY C213
Photophysical properties of semiconducting armchair-edge graphene nanoribbons — •Seyed Khalil Alavi1,2, Markus Pfeiffer1, Boris Senkovskiy3, Andrea Bliesener3, Jingyi Zhu3, Samuel Michel3, Alexei V. Fedorov4, Raphael German3, Dirk Hertel1, Danny Haberer4, Luca Petaccia5, Felix R. Fischer4, Klaus Meerholz1, Paul van Loosdrecht3, Alexander Grüneis3, and Klas Lindfors1 — 1Department of Chemistry, University of Cologne, Luxemburger Str. 116, 50939 Köln, Germany — 2Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115, Bonn, Germany — 3II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany — 4Department of Chemistry, University of California at Berkeley, Tan Hall 680, Berkeley, CA 94720, USA — 5Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149 Trieste, Italy
Armchair graphene nanoribbons are novel one-dimensional semiconductors with well defined structure and promising optoelectronic properties. We present here for the first time observation of fluorescence from graphene nanoribbons and photophysical characterization for aligned nanoribbons on insulating substrates. We further determine the excitonic resonances in the material by wavelength dependent Raman spectroscopy. From photoluminescence measurements we obtain polarized non-bleaching emission that is excited by light polarized along the ribbon. We observe a clear spectral shift from the position of the lowest exciton. The emission is attributed to bright defects in the material, which is demonstrated by controlled photochemical induction.