Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 108: Graphene: Adsorption, Intercalation and Other Aspects

O 108.3: Vortrag

Freitag, 24. März 2017, 11:00–11:15, TRE Ma

Optically switchable hybrid graphene/carbon nanomembrane field effect transistors — •Antony George, Zian Tang, David Kaiser, Christof Neumann, Andreas Winter, and Andrey Turchanin — Friedrich Schiller University Jena, Institute of Physical Chemistry, D-07743 Jena, Germany

Field effect transistors (FETs) based on 2D materials are of great interest for applications in ultrathin electronic devices and especially for sensing technology. Here we demonstrate the possibility to add an optical switchability to graphene devices by hybridizing the graphene channel with optically active azobenzene molecules. The azobenzene molecules have been incorporated to the graphene FET channel by building a van der Waals heterostructure with chemically functionalizable 1 nm thin carbon nanomembranes (CNM). Under exposure with 365 nm and 455 nm light azobenzene molecules undergo -cis and-trans molecular conformations resulting in switching of the molecular dipole. We show that these transformations triggered by external optical stimulation induces switching of the graphene FETs between two operation modes.