Single-Molecule Transport at a Rectifying GaAs Contact.
Single-Molecule Transport at a Rectifying GaAs Contact.
复制标题
DOI：
10.1021/acs.nanolett.6b04663
复制
发表时间：
2017-01
期刊：
影响因子：
10.8
通讯作者：
A. Vezzoli;Richard J Brooke;Nicoló Ferri;S. Higgins;W. Schwarzacher;R. Nichols
中科院分区：
文献类型：
--
作者：
A. Vezzoli;Richard J Brooke;Nicoló Ferri;S. Higgins;W. Schwarzacher;R. Nichols
在大多数单分子或少分子器件中，接触电极是简单的欧姆电阻器。在这里，我们描述了一种新型单分子器件，其中金属和半导体接触电极赋予电流整流功能，然后通过桥接间隙的分子对其进行修改。我们研究了 Au STM 尖端/X/n-GaAs 基板结构的结，其中“X”是一个简单的烷二硫醇或带有硫醇/甲硫醇接触的共轭单元，我们检测到与单分子的附着和分离相对应的电流跳跃。根据电流跃变的大小，我们可以推导出电导衰减常数随分子长度的变化，该值与金/分子/金结点确定的值非常吻合。通过触点的特性以及通过分子的特性赋予单分子器件功能的能力代表了单分子电子“工具箱”的显着扩展。
In most single- or few-molecule devices, the contact electrodes are simple ohmic resistors. Here we describe a new type of single-molecule device in which metal and semiconductor contact electrodes impart a function, namely, current rectification, which is then modified by a molecule bridging the gap. We study junctions with the structure Au STM tip/X/n-GaAs substrate, where "X" is either a simple alkanedithiol or a conjugated unit bearing thiol/methylthiol contacts, and we detect current jumps corresponding to the attachment and detachment of single molecules. From the magnitudes of the current jumps we can deduce values for the conductance decay constant with molecule length that agree well with values determined from Au/molecule/Au junctions. The ability to impart functionality to a single-molecule device through the properties of the contacts as well as through the properties of the molecule represents a significant extension of the single-molecule electronics "tool-box".