Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 20: Graphen: Adsorption, intercalation and doping II (joint session O/TT)
O 20.1: Talk
Monday, March 12, 2018, 16:45–17:00, MA 043
Initial investigation of the coexistence of different structural conformations, obtained via high temperature deposition of PbPc on epitaxial graphene grown on 6H-SiC(0001) — •Chitran Ghosal1,2, Samir Mammadov1, Martina Wanke1, Florian Speck1, Thomas Seyller1, and Christoph Tegenkamp2 — 1Professorship of Technical Physics, Institute of Physics, TU-Chemnitz — 2Professorship of Solid Surfaces Analysis, Institute of Physics, TU-Chemnitz
Epitaxial deposition is one of the well documented ways of doping of graphene[1]. Therefore, it is crucial to be able to study the different possible structural configurations that can be obtained via the deposition techniques.
This study deals with the analysis of different periodic structures obtained via the deposition of PbPc on epitaxial graphene, which was grown on 6H-SiC(0001) surfaces. The graphene was characterized by LEED and high resolution XPS measurements as well as STM. PbPc molecules were deposited afterwards at high temperatures of around 330degC and densely packed molecular films were grown under UHV conditions. Fourier analysis of large scale STM images revealed the coexistence of two non-orthogonal lattice structures (1.2nm X 1.6nm) and (1.35nm X 1.4nm) forming different islands separated by grain boundaries in between. The variability of the structures underlines the weak interaction of the PbPc molecules with the substrate.
[1] I. Gierz, C. Riedl, U. Starke, C. R. Ast, and K. Kern, Nano Lett. 8, 4603 (2008).