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Volume 174, 2014
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Molecular diodes enabled by quantum interference

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We use scanning tunneling microscope break-junction (STM-BJ) measurements to study the low-bias conductance and high-bias current–voltage (IV) characteristics of a series of asymmetric parameta connected diphenyl-oligoenes. From tight-binding calculations, we determine that the quantum interference features inherent in our molecular design result in a ‘through-bond’ coupling on the para-side, and through-space coupling on the meta-side. We show that these molecular junctions form single molecule diodes, and show that the rectification results from a difference in the voltage dependence of the coupling strength on the through-bond and the through-space side. The interplay between the applied voltage and the molecule–metal coupling results from the asymmetric polarizability of the conducting orbital under an external field.

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The article was received on 05 May 2014, accepted on 17 Jun 2014 and first published on 17 Jun 2014

Article type: Paper
DOI: 10.1039/C4FD00093E
Citation: Faraday Discuss., 2014,174, 79-89

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    Molecular diodes enabled by quantum interference

    A. Batra, J. S. Meisner, P. Darancet, Q. Chen, M. L. Steigerwald, C. Nuckolls and L. Venkataraman, Faraday Discuss., 2014, 174, 79
    DOI: 10.1039/C4FD00093E

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