%0 Journal Article
%T Charge transport in a zinc¨Cporphyrin single-molecule junction
%A Mickael L. Perrin
%A Christian A. Martin
%A Ferry Prins
%A Ahson J. Shaikh
%J Beilstein Journal of Nanotechnology
%D 2011
%I 
%R 10.3762/bjnano.2.77
%X We have investigated charge transport in ZnTPPdT¨CPyr (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¨Cvoltage (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¨CPyr 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.
%K mechanically controllable break junction
%K molecular conformation
%K molecular electronics
%K porphyrin
%K single-molecule transport
%U http://dx.doi.org/10.3762/bjnano.2.77