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An On-Chip Break Junction System for Combined Single-Molecule Conductance and Raman Spectroscopies

机译：用于组合单分子电导和拉曼光谱的片上断裂结系统

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摘要

Systems that are capable of robustly reproducing single-molecule junctions are an essential prerequisite for enabling the wide-spread testing of molecular electronic properties, the eventual application of molecular electronic devices, and the development of single-molecule based electrical and optical diagnostics. Here, a new approach is proposed for achieving a reliable single-molecule break junction system by using a microelectromechanical system device on a chip. It is demonstrated that the platform can (i) provide subnanometer mechanical resolution over a wide temperature range (approximate to 77-300 K), (ii) provide mechanical stability on par with scanning tunneling microscopy and mechanically controllable break junction systems, and (iii) operate in a variety of environmental conditions. Given these fundamental device performance properties, the electrical characteristics of two standard molecules (hexane-dithiol and biphenyl-dithiol) at the single-molecule level, and their stability in the junction at both room and cryogenic temperatures (approximate to 77 K) are studied. One of the possible distinctive applications of the system is demonstrated, i.e., observing real-time Raman scattering in a single-molecule junction. This approach may pave a way to achieving high-throughput electrical characterization of single-molecule devices and provide a reliable platform for the convenient characterization and practical application of single-molecule electronic systems in the future.
机译：能够稳健地再现单分子交叉点的系统是能够实现分子电子特性的广泛展开测试，最终应用的分子电子器件以及基于单分子的电气和光学诊断的发展的基本先决条件。这里，提出了一种通过在芯片上使用微机电系统装置来实现可靠的单分子断开结系统的新方法。结果表明，平台可以（i）在宽温度范围内（近似为77-300k），提供亚腔计机械分辨率，（ii）为扫描隧道显微镜和机械控制的断裂交叉区系统提供机械稳定性，（III ）在各种环境条件下操作。鉴于这些基本装置的性能性能，研究了单分子水平的两个标准分子（己烷 - 二硫醇和联苯 - 二硫醇）的电特性，以及它们在两个房间和低温温度下的连接中的稳定性（近似为77 k） 。证明了系统的可能独特应用之一，即观察单分子结中的实时拉曼散射。这种方法可以铺平方法来实现单分子器件的高通量电气表征，并提供可靠的平台，以便在未来的单分子电子系统的方便表征和实际应用。

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