Universal scaling of the charge transport in large-area molecular junctions
article
Charge transport through alkanes and para-phenylene oligomers is investigated in large-area molecular junctions. The molecules are self-assembled in a monolayer and contacted with a top electrode consisting of poly(3,4-ethylenedioxythiophene)-poly(4-styrenesulfonic acid) (PEDOT:PSS). The complete set of J(V,T) characteristics of both saturated and π-conjugated molecules can be described quantitatively by a single equation with only two fit parameters. The derived parameters, in combination with a variation of the bulk conductivity of PEDOT:PSS, demonstrate that the absolute junction resistance is factorized with that of PEDOT:PSS. The temperature and bias dependence of charge transport in large-area molecular junctions containing different molecules is investigated. The transport exhibits universal scaling, quantitatively described by a single equation with two fit parameters. The scaling shows that PEDOT:PSS exhibits a dominant role in the electrical transport in these kinds of junctions. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
TNO Identifier
430114
ISSN
16136810
Source
Small, 7(11), pp. 1593-1598.
Pages
1593-1598
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