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Charge transport in a single molecule transistor probed by scanning tunneling microscopy

Bouvron, Samuel and Graf, Alexandra and Gragnaniello, Luca and Wiedmann, Dirk and Cornelia Nef, Cornelia and Schönenberger, Christian and Fonin, Mikhail and Muarand, Romain and Erler, Philipp and Skripnik, Maxim and Engesser, Clara and Fu, Wangyang and Pauly, Fabian. (2018) Charge transport in a single molecule transistor probed by scanning tunneling microscopy. Nanoscale, 10 (3). pp. 1487-1493.

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Official URL: https://edoc.unibas.ch/68891/

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Abstract

We report on the scanning tunneling microscopy/spectroscopy (STM/STS) study of cobalt phthalocyanine (CoPc) molecules deposited onto a back-gated graphene device. We observe a clear gate voltage ( V g ) dependence of the energy position of the features originating from the molecular states. Based on the analysis of the energy shifts of the molecular features upon tuning  V g , we are able to determine the nature of the electronic states that lead to a gapped differential conductance. Our measurements show that capacitive couplings of comparable strengths exist between the CoPc molecule and the STM tip as well as between CoPc and graphene, thus facilitating electronic transport involving only unoccupied molecular states for both tunneling bias polarities. These findings provide novel information on the interaction between graphene and organic molecules and are of importance for further studies, which envisage the realization of single molecule transistors with non-metallic electrodes.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Fu, Wangyang and Nef, Cornelia and Maurand, Romain
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:RSC Publishing
ISSN:2040-3364
e-ISSN:2040-3372
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:04 Apr 2019 16:45
Deposited On:04 Apr 2019 16:45

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