Shachar Shmueli, Mor Cohen Jungerman, Pini Shekhter, Yoram Selzer
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引用次数: 0
Abstract
Molecular rectification is expected to be observed in metal–molecule–metal tunnel junctions in which the resonance levels responsible for their transport properties are spatially localized asymmetrically with respect to the leads. Yet, effects such as electrostatic screening and formation of metal induced gap states reduce the magnitude of rectification that can be realized in such junctions. Here we suggest that junctions of the form metal–molecule(s)–semimetal mitigate these interfacial effects. We report current rectification in junctions based on the semimetal bismuth (Bi) with high rectification ratios (>102) at 1.0 V using alkanethiols, molecules for which rectification has never been observed. In addition to the alleviation of screening and surface states, the efficient rectification is argued to be related to symmetry breaking of the applied bias in these junctions because of a built-in potential within the Bi lead. The significance of this built-in potential and its implications for the future and other applications are discussed.
在金属-分子-金属隧道结中有望观察到分子整流，在这种隧道结中，负责其传输特性的共振水平相对于引线在空间上是不对称定位的。然而，静电屏蔽和金属诱导间隙态的形成等效应降低了此类结中可实现的整流幅度。在这里，我们认为金属-分子-半金属形式的结可以减轻这些界面效应。我们报告了基于半金属铋（Bi）的结中的电流整流情况，在 1.0 V 电压下，烷硫醇具有很高的整流比（>102）。除了屏蔽态和表面态的缓解之外，高效整流还被认为与这些结中外加偏压的对称性破坏有关，因为铋引线中存在内置电势。本文讨论了这种内置电势的意义及其对未来和其他应用的影响。
期刊介绍：
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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