SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 39: Poster Session III: Poster to Mini-Symposium: Free-standing functional molecular 2D materials I
O 39.6: Poster
Dienstag, 2. März 2021, 10:30–12:30, P
Optically triggered control of carrier density in hybrid graphene-carbon nanomembranes field effect transistors — •Antony George1, Zian Tang1, Andreas Winter1, David Kaiser1, Christof Neumann1, Thomas Weimann2, and Andrey Turchanin1 — 1Friedrich Schiller University Jena, Institute of Physical Chemistry, 07743 Jena, Germany — 2Physikalisch-Technische Bundesanstalt (PTB), 38116 Braunschweig, Germany
Field effect transistors (FETs) based on 2D materials are of great interest for applications in ultrathin electronic and sensing devices. Here we demonstrate the possibility to add optical switchability to graphene FETs (GFET) by functionalizing the graphene channel with optically active azobenzene molecules. The azobenzene molecules have been incorporated to the GFET channel by building a van der Waals heterostructure with carbon nanomembrane (CNM) which is used as a molecular interposer to attach the azobenzene molecules. Under exposure with 365 nm and 455 nm light, azobenzene molecules undergo cis- and trans- molecular conformations respectively, resulting in a switching of the molecular dipole moment. Thus the effective molecular field acting on the GFET channel is switched by optical stimulation and the carrier density is modulated.