Understanding how the mechanism of charge transport through molecular tunneljunctions depends on temperature is crucial to control electronic function inmolecular electronic devices. With just a few systems investigated as afunction of bias and temperature so far, thermal effects in molecular tunneljunctions remain poorly understood. Here we report a detailed charge transportstudy of an individual redox-active ferrocene-based molecule over a wide rangeof temperatures and applied potentials. The results show the temperaturedependence of the current to vary strongly as a function of the gate voltage.Specifically, the current across the molecule exponentially increases in theCoulomb blockade regime and decreases at the charge degeneracy points, whileremaining temperature-independent at resonance. Our observations can be wellaccounted for by a formal single-level tunneling model where the temperaturedependence relies on the thermal broadening of the Fermi distributions of theelectrons in the leads.
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