A recent model for molecular rectification has focused upon asymmetric alkyl tunnelling barriers that link the electrodes to a conjugated unit but experimental data reported here are contradictory: self-assembled monolayers (SAMs) exhibit symmetrical current–voltage characteristics when squaraine chromophores are located at one electrode and isolated from the other by extended alkanethiolate tails.
G. J. Ashwell and R. J. Stokes, J. Mater. Chem., 2004, 14, 1228 DOI: 10.1039/B401018C
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