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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.
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Ashwell et al. (2004) studied this question.
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