Structure-to-function relationship for charge transport in atomically defined graphene nanoribbons
Nils Richter (Institut für Physik)

Graphene nanoribbons (GNRs) are few atoms wide nanostructures of graphene and attract particular attention due to the physical phenomena that result from their geometrical confinement. In chemically synthesized GNRs the edge structure is perfect on the atomic level [1]. They are synthesized on gold surfaces employing chemical vapor deposition [2]. Using specially tailored precursor molecules it is possible to obtain a variety of different GNRs. By evaluating their electric field dependence in standard FET devices, we determine the conductivity and mobility of chevron edged structures with 9 carbon atoms across the ribbon (N=9). We compare their properties with armchair edged ribbons with N=9 to test the influence of the edge structure. Secondly, armchair ribbons with N=7 and N=9 are studied to test for the influence of the ribbon width. Finally, by modifying the precursors hetero-atomic doping with nitrogen and co-doping with nitrogen and sulfur is obtained for which a reduction of the charge carrier mobility is observed [3].

[1] A. Narita et al., Nature Chem. 6, 126 (2014). [2] Z. Chen et al., (under Revision 2016). [3] N. Richter et al., (manuscript in preparation 2016).