Probing the nature and resistance of the molecule–electrode contact in SAM-based junctions
文献情報
C. S. Suchand Sangeeth, Albert Wan
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.
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掲載誌
Nanoscale
Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers. Highly interdisciplinary, Nanoscale appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics. For publication in Nanoscale, papers must report high-quality reproducible new work that will be of significant general interest to the journal's wide international readership. Nanoscale is a collaborative venture between the Royal Society of Chemistry Publishing and a leading nanoscience research centre, the National Center for Nanoscience and Technology (NCNST) in Beijing, China. image block The journal publishes weekly issues, complementing and building on the nano content already published across the Royal Society of Chemistry Publishing journal portfolio. Since its launch in late 2009, Nanoscale has established itself as a platform for high-quality, cross-community research that bridges the various disciplines involved with nanoscience and nanotechnology, publishing important research from leading international research groups.
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