Abstract
We studied the temperature-dependent electrical properties of ferrocene-alkanethiolate molecular electronic junctions fabricated by a conventional solid-state device technique using a conducting polymer poly(3,4-ethylenedioxythiophene) stabilized with a poly(4-styrenesulfonic acid) (known as PEDOT:PSS) interlayer. We had previously observed unusual temperature-dependent electrical characteristics at a voltage polarity larger than +0.6 V and at temperatures higher than ∼220 K (see Adv. Funct. Mater. 2014, 24, 2472). The origin of this distinctive behavior was ascribed to redox-induced conformational changes of the ferrocene-alkanethiolate molecules. We performed temperature-dependent transition voltage spectroscopy analysis based on the multibarrier tunneling model to support the proposed redox-induced conformational changes observed in the ferrocene-alkanethiolate molecular junctions. The obtained results were consistent with the unusual thermal characteristics of the ferrocene-alkanethiolate molecular junctions predicted by the proposed redox-induced conformational changes of the molecules.
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