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Charge transport in a zinc-porphyrin single-molecule junction.


ABSTRACT: We have investigated charge transport in ZnTPPdT-Pyr (TPPdT: 5,15-di(p-thiolphenyl)-10,20-di(p-tolyl)porphyrin) molecular junctions using the lithographic mechanically controllable break-junction (MCBJ) technique at room temperature and cryogenic temperature (6 K). We combined low-bias statistical measurements with spectroscopy of the molecular levels in the form of I(V) characteristics. This combination allows us to characterize the transport in a molecular junction in detail. This complex molecule can form different junction configurations, having an observable effect on the trace histograms and the current-voltage (I(V)) measurements. Both methods show that multiple, stable single-molecule junction configurations can be obtained by modulating the interelectrode distance. In addition we demonstrate that different ZnTPPdT-Pyr junction configurations can lead to completely different spectroscopic features with the same conductance values. We show that statistical low-bias conductance measurements should be interpreted with care, and that the combination with I(V) spectroscopy represents an essential tool for a more detailed characterization of the charge transport in a single molecule.

SUBMITTER: Perrin ML 

PROVIDER: S-EPMC3201625 | biostudies-literature | 2011

REPOSITORIES: biostudies-literature

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Charge transport in a zinc-porphyrin single-molecule junction.

Perrin Mickael L ML   Martin Christian A CA   Prins Ferry F   Shaikh Ahson J AJ   Eelkema Rienk R   van Esch Jan H JH   van Ruitenbeek Jan M JM   van der Zant Herre S J HS   Dulić Diana D  

Beilstein journal of nanotechnology 20111018


We have investigated charge transport in ZnTPPdT-Pyr (TPPdT: 5,15-di(p-thiolphenyl)-10,20-di(p-tolyl)porphyrin) molecular junctions using the lithographic mechanically controllable break-junction (MCBJ) technique at room temperature and cryogenic temperature (6 K). We combined low-bias statistical measurements with spectroscopy of the molecular levels in the form of I(V) characteristics. This combination allows us to characterize the transport in a molecular junction in detail. This complex mole  ...[more]

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