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You are here: Home / Physics Lab / Electrostatic Control over Temperature-Dependent Tunneling across a Single Molecule Junction

July 15, 2016 By delbarco

Electrostatic Control over Temperature-Dependent Tunneling across a Single Molecule Junction

WORK PUBLISHED IN NATURE COMMUNICATIONS and SCIENTIFIC REPORTS

SET vs T

Understanding how the mechanism of charge transport through molecular tunnel junctions depends on temperature is crucial to control electronic function in molecular electronic devices. So far only a few systems have been investigated as a function of bias and temperature and, consequently, thermal effects in molecular tunnel junctions are still poorly understood. Here we report a detailed charge transport study of an individual redox-active molecule (based on ferrocene) 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: i) exponentially increases in the Coulomb blockade regime; ii) decreases at the charge degeneracy points; and, iii) remains constant with temperature at resonance. Our observations can be well accounted for by a formal single-level tunneling model where the temperature dependence relies on the thermal broadening of the Fermi distributions of the electrons in the leads. A detailed analysis of these physics and interpretation of results in different kind of tunnel junctions can be found in the extended report in Scientific Reports.

References:

A. R. Garrigues, L. Yuan, L. Wang, E. R. Mucciolo, D. Thompson, E. del Barco, and C. A. Nijhuis
“Electrostatic Control over Temperature-Dependent Tunneling across a Single Molecule Junction”
Nat. Commun. 7, 11595 (2016)

A. R. Garrigues, L. Yuan, L. Wang, E. R. Mucciolo, D. Thompson, E. del Barco, and C. A. Nijhuis
“A Single-Level Tunnel Model to Account for Electrical Transport through Single Molecule- and Self-Assembled Monolayer-based Junctions”
Sci. Rep. 6, 26517 (2016)

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