Chemical Site Capacitance: Submolecular Measurements and a Model

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• 作者：Roie Yerushalmi ; Milko E. van der Boom ; Hagai Cohen
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：September 20, 2007
• 年：2007
• 卷：111
• 期：37
• 页码：13652 - 13654
• 全文大小：57K
• 年卷期：v.111,no.37(September 20, 2007)
• ISSN：1932-7455

文摘

The study of molecular electric properties is an intriguing, rapidly developing field in which technologicaland basic scientific challenges and developments are evolving. Nevertheless, understanding of the interplayof intermolecular interactions, substrate effects, and electrode contacts remains challenging. Here, we presentnoncontact chemically resolved electrical measurements (CREM) of halide-terminated molecular layers anda straightforward model for quantitative analysis of submolecular chemical site capacitance. We demonstratethat under low current densities, the main electronic effects can be accounted for by considering the (sub)molecular properties of the monolayers, whereas the excess potential due to charge injection can be describedas site capacitance corresponding to chemically identifiable molecular sites.