Flicker Noise as a Probe of Electronic Interaction at Metal鈥揝ingle Molecule Interfaces

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• 作者：Olgun Adak ; Ethan Rosenthal ; Jeffery Meisner ; Erick F. Andrade ; Abhay N. Pasupathy ; Colin Nuckolls ; Mark S. Hybertsen ; Latha Venkataraman
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：June 10, 2015
• 年：2015
• 卷：15
• 期：6
• 页码：4143-4149
• 全文大小：392K
• ISSN：1530-6992

文摘

Charge transport properties of metal鈥搈olecule interfaces depend strongly on the character of molecule鈥揺lectrode interactions. Although through-bond coupled systems have attracted the most attention, through-space coupling is important in molecular systems when, for example, through-bond coupling is suppressed due to quantum interference effects. To date, a probe that clearly distinguishes these two types of coupling has not yet been demonstrated. Here, we investigate the origin of flicker noise in single molecule junctions and demonstrate how the character of the molecule鈥揺lectrode coupling influences the flicker noise behavior of single molecule junctions. Importantly, we find that flicker noise shows a power law dependence on conductance in all junctions studied with an exponent that can distinguish through-space and through-bond coupling. Our results provide a new and powerful tool for probing and understanding coupling at the metal-molecule interface.