Temperature-dependent molecular conduction measured by the electrochemical deposition of a platinum electrode in a lateral configuration

Kim, B.; Ahn, S. J.; Park, J. G.; Lee, S. H.; Park, Y. W.; Campbell, E.E.B.
November 2004
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4756
Academic Journal
Temperature-dependent current-voltage (I-V) characteristics of a molecule, 1,4-benzenedimethanethiol, was measured for 30 K < T< 300 K by a method of contact made by the electrochemical deposition of a platinum electrode in a lateral configuration. The I-V characteristics are nonlinear and asymmetric in the entire temperature range and the current decreases with decreasing temperature down to 40 K. Below 40 K, the I-V characteristics become temperature independent. The asymmetric I-V characteristics can be understood as arising from a better contact on one side (made by the self-assembled monolayer) than on the other side (made by the electrochemically deposited Pt electrode). The activation energy of thermally activated conduction for T > 100 K is typically 0.11 eV. For T < 40 K, the observed temperature independent I-V characteristics are fitted to the Fowler-Nordheim tunneling expression with harrier height of 1-2 eV depending on the contact strength of samples.


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