Transport through Redox-Active Ru-Terpyridine Complexes Integrated in Single Nanoparticle Devices
- Transition metal complexes are electrofunctional molecules due to their high conductivity and their intrinsic switching ability involving a metal-to-ligand charge transfer. Here, a method is presented to contact reliably a few to single redox-active Ru-terpyridine complexes in a CMOS compatible nanodevice and preserve their electrical functionality. Using hybrid materials from 14 nm gold nanoparticles (AuNP) and bis-{4′-[4-(mercaptophenyl)-2,2′:6′,2″-terpyridine]}-ruthenium(II) complexes a device size of 30² nm² inclusive nanoelectrodes is achieved. Moreover, this method bears the opportunity for further downscaling. The Ru-complex AuNP devices show symmetric and asymmetric current versus voltage curves with a hysteretic characteristic in two well separated conductance ranges. By theoretical approximations based on the single-channel Landauer model, the charge transport through the formed double-barrier tunnel junction is thoroughly analyzed and its sensibility to the molecule/metal contact is revealed. It can be verified that tunneling transport through the HOMO is the main transport mechanism while decoherent hopping transport is present to a minor extent.
Author: | Max Mennicken, Sophia K. Peter, Corinna Kaulen, Ulrich Simon, Silvia Karthäuser |
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DOI: | https://doi.org/10.1021/acs.jpcc.9b11716 |
ISSN: | 1932-7455 |
Parent Title (English): | The Journal of Physical Chemistry C |
Publisher: | ACS Publications |
Place of publication: | Washington, DC |
Document Type: | Article |
Language: | English |
Year of Completion: | 2020 |
Volume: | 124 |
Issue: | 8 |
First Page: | 4881 |
Last Page: | 4889 |
Link: | https://doi.org/10.1021/acs.jpcc.9b11716 |
Zugriffsart: | campus |
Institutes: | FH Aachen / Fachbereich Medizintechnik und Technomathematik |
FH Aachen / INB - Institut für Nano- und Biotechnologien | |
collections: | Verlag / ACS Publications |