Multivariate Approach to Single-Molecule Thermopower and Electrical Conductance Measurements
Multivariate Approach to Single-Molecule Thermopower and Electrical Conductance Measurements
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DOI：
10.1021/acs.jpcc.1c08608
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发表时间：
2021-12-02
影响因子：
3.7
通讯作者：
Albrecht, Tim
中科院分区：
文献类型：
--
作者：
Hamill, Joseph M.;Weaver, Christopher;Albrecht, Tim
本文报道了一种利用扫描隧道显微镜对单分子断裂结进行热电势和电导同时测量和关联的方法。与以前报道的方法相比，它不需要定制的电子器件，并利用了在Au/Au接触处的热偏移的逐迹校准，从而极大地促进了单分子水平的热电测量。我们报告了三个分子的测量，1，4-二（4-（乙炔基（苯硫代乙酸酯）苯，1，8-辛二硫醇，和4，4 '-联吡啶，并确定单分子塞贝克系数分别为12（3），5（2），和-5（2）μ V K-1。此外，该方法统计相关的塞贝克电压偏移，电导，和拉伸位移的单分子结，并允许直接比较与电流距离光谱结果在恒定的偏置。
We report a method using scanning tunneling microscope single molecular break junction to simultaneously measure and correlate the single-molecule thermopower and electrical conductance. In contrast to previously reported approaches, it does not require custom-built electronics and takes advantage of a trace-by-trace calibration of the thermal offset at the Au/Au contact, thus greatly facilitating thermoelectric measurements at the single-molecule level. We report measurements of three molecules, 1,4-di(4-(ethynyl(phenylthioacetate))) benzene, 1,8-octanedithiol, and 4,4'-bipyridine, and determine single-molecule Seebeck coefficients of 12(3), 5(2), and -5(2) mu V K-1, respectively. Furthermore, the method statistically correlates the Seebeck voltage offset, electrical conductance, and stretching displacement of the single-molecule junction and allows for direct comparison with current-distance spectroscopy results obtained at constant bias.