Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Graphene

O 55.4: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-EG

Novel preparation technique for high quality graphene on boron nitride samples for combined electrical transport and STM measurements — •Tjorven Johnsen, Michael Weimer, Peter Nemes-Incze, and Markus Morgenstern — II. Physikalisches Institut B, RWTH Aachen, Otto-Blumenthal-Straße, 52074 Aachen

Whereas in electrical transport experiments suspended graphene samples or samples sandwiched between to boron nitride flakes show the highest mobility due to low charge disorder they are not accessible for scanning tunneling microscopy (STM). STM requires a graphene flake that is supported by a substrate and features an exposed surface. Here we present a novel technique to prepare such graphene samples on boron nitride substrates. A mica support is used to pick up boron nitride and graphene flakes from SiO₂ substrates. The graphene flake is contacted by gold evaporation through a shadow mask. In contrast to other fabrication methods we avoid any polymers in the process that works without any wet chemistry leading to a dry and polymer free transfer and contacting process for 2D materials. In addition to the low density of adsorbates on the graphene surface the clean and flat boron nitride substrate leads to high quality graphene samples.