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O: Fachverband Oberflächenphysik

O 111: Nanostructures at Surfaces: Molecular Systems III

O 111.6: Vortrag

Freitag, 24. März 2017, 11:45–12:00, REC/PHY C213

Photophysical properties of semiconducting armchair-edge graphene nanoribbons — •Seyed Khalil Alavi^1,2, 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.