Issue 28, 2015

Probing the nature and resistance of the molecule–electrode contact in SAM-based junctions

Abstract

It is challenging to quantify the contact resistance and to determine the nature of the molecule–electrode contacts in molecular two-terminal junctions. Here we show that potentiodynamic and temperature dependent impedance measurements give insights into the nature of the SAM–electrode interface and other bottlenecks of charge transport (the capacitance of the SAM (CSAM) and the resistance of the SAM (RSAM)), unlike DC methods, independently of each other. We found that the resistance of the top-electrode–SAM contact for junctions with the form of AgTS–SCn//GaOx/EGaIn with n = 10, 12, 14, 16 or 18 is bias and temperature independent and hence Ohmic (non-rectifying) in nature, and is orders of magnitude smaller than RSAM. The CSAM and RSAM are independent of the temperature, indicating that the mechanism of charge transport in these SAM-based junctions is coherent tunneling and the charge carrier trapping at the interfaces is negligible.

Graphical abstract: Probing the nature and resistance of the molecule–electrode contact in SAM-based junctions

Supplementary files

Article information

Article type
Paper
Submitted
21 Apr 2015
Accepted
04 Jun 2015
First published
11 Jun 2015

Nanoscale, 2015,7, 12061-12067

Author version available

Probing the nature and resistance of the molecule–electrode contact in SAM-based junctions

C. S. Suchand Sangeeth, A. Wan and C. A. Nijhuis, Nanoscale, 2015, 7, 12061 DOI: 10.1039/C5NR02570B

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