| AVS 65th International Symposium & Exhibition | |
| 2D Materials Focus Topic | Wednesday Sessions |
| Session 2D+MN+NS+SS-WeA |
| Session: | IoT Session: Surface Chemistry, Functionalization, Bio and Sensor Applications |
| Presenter: | Xianghui Zhang, Bielefeld University, Germany |
| Authors: | X.H. Zhang, Bielefeld University, Germany P. Penner, Bielefeld University, Germany E. Marschewski, Bielefeld University, Germany T. Weimann, Physikalisch-Technische Bundesanstalt, Braunschweig, Germany P. Hinze, Physikalisch-Technische Bundesanstalt, Braunschweig, Germany A. Gölzhäuser, Bielefeld University, Germany |
| Correspondent: | Click to Email |
Carbon nanomembranes (CNMs) are two-dimensional materials that are made by cross-linking self-assembled monolayers (SAMs) of aromatic molecules via low energy electron irradiation. Previous studies of the charge transport in molecular junction incorporating SAMs and CNMs of oligophenyl thiols has been carried out by using conical eutectic Gallium-Indium (EGaIn) top-electrodes1 and conductive probe atomic force microscopy (CP-AFM)2. Additional investigations of the dielectric properties of pristine SAMs and CNMs were performed by impedance spectroscopy on EGaIn tunneling junctions. Here we demonstrate the fabrication and characterization of all-carbon capacitors (ACCs) composed of multilayer stacks of dielectric CNMs that are sandwiched between two types of carbon-based conducting electrodes: (1) trilayer graphene made by chemical vapor deposition and mechanical stacking; (2) pyrolyzed graphitic carbon (PGC) made by pyrolysis of cross-linked aromatic molecules. The junction area is defined by the width of electrode ribbons, ranging from 1 to 2500 µm2, and the separation between two electrodes is tuned by the number of CNM layers. The frequency response of nanocapacitors was measured with an LCR meter. A dielectric constant of 3.5 and a capacitance density of up to 0.5 µF/cm2 were derived from the junction capacitance. A dielectric strength of 6.2 MV/cm was determined. These results show the potential of carbon nanomembranes to be used as dielectric components in next-generation environment-friendly carbon-based molecular electronic devices.
1 P. Penner, X. Zhang, E. Marschewski, F. Behler, P. Angelova, A. Beyer, J. Christoffers, A. Gölzhäuser, Journal of Physical Chemistry C, 2014, 118, 21687.
2 X. Zhang, E. Marschewski, P. Penner, A. Beyer and A. Gölzhäuser, Journal of Applied Physics, 2017, 122, 055103.