Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Poster: Molecular Films - Photovoltaics, Electronics and Morphology
O 46.3: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
All-carbon nanocapacitors from graphene and carbon nanomembrane heterostructures — •Xianghui Zhang1, Emanuel Marschewski1, Paul Penner1, Thomas Weimann2, Peter Hinze2, and Armin Gölzhäuser1 — 1Faculty of Physics, University of Bielefeld, 33615 Bielefeld, Germany — 2Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
Molecular self-assembly allows a precise control of material structure and chemical composition. Here we show the fabrication of all-carbon nanocapacitors composed of multilayer stacks of carbon nanomembranes (CNMs) as dielectrics and graphene as conducting electrodes. CNMs were formed from a series of aromatic self-assembled monolayers of phenylthiol homologues, i.e. biphenylthiol, p-terphenylthiol, and p-quaterphenylthiol. The frequency response of nanocapacitors was measured with an LCR meter and the impedance spectra were analyzed with a simple equivalent circuit, in which the graphene strips were modeled as resistors and the CNM dielectric as a dissipative capacitor. A dielectric strength of up to 4 MV/cm and a capacitance density of up to 0.4 µF/cm2 were determined for multilayer carbon nanomembranes. The heterostructures possess an interfacial capacitance of 0.5 µF/cm2. These results show the potential of carbon nanomembranes to be used as dielectric components in next-generation molecular electronics.