Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 46: Poster Session: Graphene (joint session O/TT)
TT 46.3: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Preparation and characterization of high quality stacks of graphene/h-BN/graphite picked up by a mica substrate — •Michael Weimer1, Tjorven Johnsen1, Sayanti Samaddar1, Peter Nemes-Incze2, and Markus Morgenstern1 — 1II. Institute of Physics B, RWTH Aachen University and JARA-FIT, Otto-Blumenthal-Straße, 52074 Aachen, Germany — 2Centre of Energy Research, Institute of Technical Physics and Materials Science, Nanotechnology Department, 2D NanoFab ERC Research Group, Budapest, 1525, POB 49, Hungary
Graphene on h-BN provides a highly mobile two-dimensional electron system (2DES) which can be characterized by scanning tunneling microscopy (STM). In combination with transport experiments, a comparison of global and local properties of the sample is feasible. Such combination requires an ultra clean graphene surface and at least two electrical contacts. Therefore we present a dry and polymer free preparation technique by using a mica substrate. We exfoliate graphite on mica and subsequently pick up h-BN and graphene from a SiO2/Si chip one after another. Shadow mask evaporation of gold provides clean contacting. Omitting wet chemical methods and polymers enables ultra clean surfaces with low impurity concentration.