We theoretically study the electronic transport in the monolayer ofdithiolated phenylene vinylene oligomeres coupled to the (111) surfaces of goldelectrodes. We use non-equilibrium Green functions (NEGF) and densityfunctional theory(DFT) implemented in the TranSIESTA package to obtain a fullab initio self-consistent description ofthe transport current through themolecular nanostructure with different electrochemical bias potentials. Thecalculated current-voltage characteristics (IVC) of the systems for the samecontact geometry have shown a systematic decrease of the conductivity with theincreased length of the molecules. We analyze the results in terms oftransmission eigenchannels and find that besides the delocalization ofmolecular orbitals the distance between gold electrodes also determines thetransport properties.
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