Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.53: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Doping on Epitaxial Graphen on SiC with Molecular Adsorbates — •Martina Wanke1, Anton Tadich2, Mark Edmonds3, Lothar Ley4, Felix Fromm1, Yaou Smets3, Christian Raidel1, Christian Heidrich1, Zoran Mazej5, John Riley3, Chris Pakes3, and Thomas Seyller1 — 1TU Chemnitz, Insitut für Physik, Germany — 2Australian Synchrotron, Soft-X-ray-Beamline, Clayton, Victoria, Australia — 3La Trobe University, School of Physics, Bundoora, Victoria, Australia — 4FAU Erlangen-Nürnberg, Institut für Festkörperphysik, Erlangen, Germany — 5Joseph Stefan Institute Ljubljana, Slovenia
Molecular doping of epitaxial graphene and quasi-freestanding graphene on SiC(0001) was used to tune the doping type character. Epitaxial graphene on SiC shows a strong intrinsical n-type character [1, 2]. It was possible not only to achieve charge neutrality as it was shown for F4-TCNQ [3,4], but to effectively p-type dope graphene by using of C60F48. While quasi-freestanding graphene is already p-type doped, it was possible to increase the amount of p-type doping. Angle-resolved photoemission was used to determine the amount of doping [3,4,5,6].
[1] T.Ohta,et al.,Science 313,951(2006). [2] J.Jobst,et al.,PRB 81,195434(2010). [3] W.Chen,et al.,JACS 129,10418(2007). [4] C.Coletti,et al.,PRB 81,235401(2010). [5] A.L.Walter,et al.,APL 98,184102(2011). [6] A. Tadich, et al., APL 102, 241601 (2013).