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Electrostatic control over temperature-dependent tunnelling across a single-molecule junction

Author

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  • Alvar R. Garrigues

    (University of Central Florida)

  • Lejia Wang

    (National University of Singapore
    Present address: School of Chemical Engineering, Ningbo University of Technology, Ningbo, Zhejiang, 315016, P.R. China.)

  • Enrique del Barco

    (University of Central Florida)

  • Christian A. Nijhuis

    (National University of Singapore
    Centre for Advanced 2D Materials, National University of Singapore)

Abstract

Understanding how the mechanism of charge transport through molecular tunnel junctions depends on temperature is crucial to control electronic function in molecular electronic devices. With just a few systems investigated as a function of bias and temperature so far, thermal effects in molecular tunnel junctions remain poorly understood. Here we report a detailed charge transport study of an individual redox-active ferrocene-based molecule over a wide range of temperatures and applied potentials. The results show the temperature dependence of the current to vary strongly as a function of the gate voltage. Specifically, the current across the molecule exponentially increases in the Coulomb blockade regime and decreases at the charge degeneracy points, while remaining temperature-independent at resonance. Our observations can be well accounted for by a formal single-level tunnelling model where the temperature dependence relies on the thermal broadening of the Fermi distributions of the electrons in the leads.

Suggested Citation

  • Alvar R. Garrigues & Lejia Wang & Enrique del Barco & Christian A. Nijhuis, 2016. "Electrostatic control over temperature-dependent tunnelling across a single-molecule junction," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11595
    DOI: 10.1038/ncomms11595
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