Optimised power harvesting by controlling the pressure applied to molecular junctions.
Optimised power harvesting by controlling the pressure applied to molecular junctions.
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通过控制施加到分子连接处的压力来优化能量收集。
DOI：
10.1039/d1sc00672j
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发表时间：
2021-03-04
期刊：
影响因子：
8.4
通讯作者：
Lambert C
中科院分区：
文献类型：
--
作者：
Wang X;Ismael A;Almutlg A;Alshammari M;Al-Jobory A;Alshehab A;Bennett TLR;Wilkinson LA;Cohen LF;Long NJ;Robinson BJ;Lambert C
使用自组装分子层制造热电装置的主要潜在优点是它们的机械柔性。以前的报道已经从易于皮肤附着和避免机械变形的能力的角度讨论了这种柔性的优点。在这项工作中，我们证明了这种分子器件的热电性能可以通过利用它们的机械灵活性来控制。利用改进的原子力显微镜系统测量了硫醇封端分子自组装单分子膜（SAMs）的热电性能，并通过调节探针与有机薄膜之间的加载力，改变金属-分子界面的倾斜角来控制SAMs的构象.我们跟踪了SAM的热功率偏移与倾斜角的关系，并表明电导率和塞贝克系数联合收割机的变化结合在一起，以优化特定角度下的功率因数。这种优化的热电性能，通过施加的压力是通过使用理论计算确认，预计将是一个通用的方法，用于优化自组装膜的功率因数。使用自组装分子层制造热电装置的主要潜在优点是它们的机械柔性。
A major potential advantage of creating thermoelectric devices using self-assembled molecular layers is their mechanical flexibility. Previous reports have discussed the advantage of this flexibility from the perspective of facile skin attachment and the ability to avoid mechanical deformation. In this work, we demonstrate that the thermoelectric properties of such molecular devices can be controlled by taking advantage of their mechanical flexibility. The thermoelectric properties of self-assembled monolayers (SAMs) fabricated from thiol terminated molecules were measured with a modified AFM system, and the conformation of the SAMs was controlled by regulating the loading force between the organic thin film and the probe, which changes the tilt angle at the metal-molecule interface. We tracked the thermopower shift vs. the tilt angle of the SAM and showed that changes in both the electrical conductivity and Seebeck coefficient combine to optimize the power factor at a specific angle. This optimization of thermoelectric performance via applied pressure is confirmed through the use of theoretical calculations and is expected to be a general method for optimising the power factor of SAMs. A major potential advantage of creating thermoelectric devices using self-assembled molecular layers is their mechanical flexibility.
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