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

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.

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530 Physik

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BOUVRON, Samuel, Romain MAURAND, Alexander GRAF, Philipp ERLER, Luca GRAGNANIELLO, Maxim SKRIPNIK, Dirk WIEDMANN, Clara ENGESSER, Fabian PAULY, Mikhail FONIN, 2018. Charge transport in a single molecule transistor probed by scanning tunneling microscopy. In: Nanoscale. 2018, 10(3), pp. 1487-1493. ISSN 2040-3364. eISSN 2040-3372. Available under: doi: 10.1039/c7nr06860c

BibTex

@article{Bouvron2018Charg-41100,
  year={2018},
  doi={10.1039/c7nr06860c},
  title={Charge transport in a single molecule transistor probed by scanning tunneling microscopy},
  number={3},
  volume={10},
  issn={2040-3364},
  journal={Nanoscale},
  pages={1487--1493},
  author={Bouvron, Samuel and Maurand, Romain and Graf, Alexander and Erler, Philipp and Gragnaniello, Luca and Skripnik, Maxim and Wiedmann, Dirk and Engesser, Clara and Pauly, Fabian and Fonin, Mikhail}
}

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