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Reversible Soft Top-Contacts to Yield Molecular Junctions with Precise and Reproducible Electrical Characteristics

机译：可逆的软顶触头可产生具有精确且可复制的电气特性的分子结

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摘要

The reproducibility of the electrical characteristics of molecular junctions has been notoriously low. This paper describes a method to construct tunnel junctions based on self-assembled monolayers (SAMs) by forming reversible electrical contacts to SAMs using top-electrodes of a non-Newtonian liquid-metal (GaO_x/EGaIn) stabilized in a microfluidic-based device. A single top-electrode can be used to form up to 15-25 junctions. This method generates SAM-based junctions with highly reproducible electrical characteristics in terms of precision (widths of distributions) and replicability (closeness to a reference value). The reason is that this method, unlike other approaches that rely on cross-bar or nano/micropore configurations, does not require patterning of the bottom-electrodes and is compatible with ultra-flat template-stripped (TS) surfaces. This compatibly with non-patterned electrodes is important for three reasons. ⅰ) No edges of the electrodes are present at which SAMs cannot pack well. ⅱ) Patterning requires photoresist that may contaminate the electrode and complicate SAM formation. ⅲ) TS-surfaces contain large grains, have low rms values, and can be obtained and used (in ordinary laboratory conditions) within a few seconds to minimize contamination. The junctions have very good electrical stability (2500 current-voltage cycles and retained currents for 27 h), and can be fabricated with good yields (≈78%).
机译：众所周知，分子结的电学特征的再现性很低。本文介绍了一种方法，该方法通过使用稳定在微流控设备中的非牛顿液态金属（GaO_x / EGaIn）的上电极形成与SAM的可逆电接触，从而基于自组装单层（SAM）构造隧道结。单个顶部电极可用于形成多达15-25个结。这种方法生成的基于SAM的结在精度（分布宽度）和可复制性（接近参考值）方面具有高度可重复的电气特性。原因是，该方法与其他依赖于交叉杆或纳米/微孔构型的方法不同，它不需要对底部电极进行构图，并且与超平坦模板剥离（TS）表面兼容。由于以下三个原因，与非图案化电极兼容非常重要。 ⅰ）没有出现SAM无法很好包装的电极边缘。 ⅱ）图案化需要光致抗蚀剂，该光致抗蚀剂会污染电极并使SAM的形成复杂化。 ⅲ）TS表面包含大晶粒，均方根值低，可以在几秒钟内获得并使用（在常规实验室条件下），以最大程度地减少污染。结具有非常好的电稳定性（2500个电流-电压周期和27小时的保持电流），并且可以以良好的成品率（≈78％）进行制造。

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  • 来源
    《Advanced Functional Materials》 |2014年第28期|4442-4456|共15页
  • 作者

    Albert Wan; Li Jiang; C. S. Suchand Sangeeth; Christian A. Nijhuis;

  • 作者单位

    Department of Chemistry National University of Singapore 3 Science Drive 3 117543, Singapore;

    Department of Chemistry National University of Singapore 3 Science Drive 3 117543, Singapore;

    Department of Chemistry National University of Singapore 3 Science Drive 3 117543, Singapore;

    Department of Chemistry National University of Singapore 3 Science Drive 3 117543, Singapore,Solar Energy Research Institute of Singapore (SERIS) 7 Engineering Drive 1 National University of Singapore Singapore 117574, Singapore,Graphene Research Centre National University of Singapore 2 Science Drive 3, Singapore 117542, Singapore;

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