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Temperature-Dependent Tunneling in Furan Oligomer Single-Molecule Junctions
ACS Sensors ( IF 8.9 ) Pub Date : 2021-02-02 , DOI: 10.1021/acssensors.0c02278
Haipeng B. Li 1, 2 , Yan-Feng Xi 1 , Ze-Wen Hong 3 , Jingxian Yu 4 , Xiao-Xia Li 1 , Wen-Xia Liu 1 , Lucas Domulevicz 2 , Shan Jin 1 , Xiao-Shun Zhou 3 , Joshua Hihath 2
Affiliation  

Two commonly observed charge transport mechanisms in single-molecule junctions are coherent tunneling and incoherent hopping. It has been generally believed that tunneling processes yield temperature-independent conductance behavior and hopping processes exhibit increasing conductance with increasing temperature. However, it has recently been proposed that tunneling can also yield temperature-dependent transport due to the thermal broadening of the Fermi energy of the contacts. In this work, we examine a series of rigid, planar furan oligomers that are free from a rotational internal degree of freedom to examine the temperature dependence of tunneling transport directly over a wide temperature range (78–300 K). Our results demonstrate conductance transition from a temperature-independent regime to a temperature-dependent regime. By examining various hopping and tunneling models and the correlation between the temperature dependence of conductance and molecular orbital energy offset from the Fermi level, we conclude thermally assisted tunneling is the dominant cause for the onset of temperature-dependent conductance in these systems.

中文翻译:

呋喃低聚物单分子结中的温度依赖性隧穿

单分子结中两个通常观察到的电荷传输机制是相干隧穿和不相干跳变。通常认为,隧穿过程产生与温度无关的电导行为,并且跳跃过程随着温度的升高而表现出电导的增加。然而,最近提出,由于接触的费米能量的热展宽,隧穿也可以产生取决于温度的传输。在这项工作中,我们研究了一系列刚性的,平面的呋喃低聚物,这些低聚物没有旋转的内部自由度,可以在很宽的温度范围(78-300 K)内直接研究隧穿运输的温度依赖性。我们的结果证明了电导从温度无关状态过渡到温度依赖性状态。
更新日期:2021-02-26
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