Variable-temperature study of the transport through a single octanethiol molecule


Heimbuch, R.U. and Wu, H. and Kumar, A. and Poelsema, B. and Schön, P.M. and Vancso, G.J. and Zandvliet, H.J.W. (2012) Variable-temperature study of the transport through a single octanethiol molecule. Physical review B: Condensed matter and materials physics, 86 (7). 075456. ISSN 1098-0121

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Abstract:Working on a true molecular level is essential for advances in the field of molecular electronics. Techniques have to be perfected and new approaches have to be developed in order to characterize the properties of a single molecule. In this work we report temperature-dependent transport studies of a single octanethiol molecule trapped between the apex of a scanning tunneling microscope tip and a substrate. At each temperature the molecule is brought into contact by decreasing the gap between tip and substrate in a controlled way. At a positive sample bias the molecule jumps into contact upon approaching the substrate by 0.16±0.01 nm with respect to a fixed reference point defined by a sample bias of +1.5 V and a tunneling current of 0.5 nA. The conductance of octanethiol is temperature independent, demonstrating that either tunneling or ballistic transport is the main transport mechanism
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Copyright:© 2012 American Physical Society
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Metis ID: 287534