An accurate method to determine the through-plane electrical conductivity and to study transport properties in film samples
An accurate method to determine the through-plane electrical conductivity and to study transport properties in film samples
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DOI：
10.1016/j.orgel.2016.08.030
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发表时间：
2016-11
影响因子：
3.2
通讯作者：
Qingshuo Wei;H. Suga;Ichitaka Ikeda;M. Mukaida;K. Kirihara;Y. Naitoh;T. Ishida
中科院分区：
文献类型：
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作者：
Qingshuo Wei;H. Suga;Ichitaka Ikeda;M. Mukaida;K. Kirihara;Y. Naitoh;T. Ishida
薄膜样品的贯通面电导率至关重要，因为它在很大程度上影响电池、电容器和热电器件的性能。在这项研究中，我们开发了一种改进的四探针通过平面电导率测量方法，使用同轴结构。这种方法是通用的，适用于独立式薄膜样品。我们研究了不同的样品，包括钢板，高取向热解石墨，导电聚合物。通过在100 K下进行低温测量，确认了钢板中的金属输运和石墨中的穿面方向的跳跃输运。在导电聚合物聚（3，4-亚乙基二氧噻吩）/聚苯乙烯磺酸盐的情况下，电导率各向异性比随着面内电导率的增加而降低。随温度变化的测量结果表明，在PEDOT/PSS的通过平面方向上的两个不同的活化能制度，但几乎没有变化的面内电导率的活化能。这可能是由于在贯穿平面方向上通过更无序的区域（富含PSS的区域）发生的附加载流子路径。我们还检查了PEDOT/PSS中的Meyer-Neldel规则，并得出结论，PEDOT/PSS遵循反Meyer-Neldel规则，这可能是由于膜中的高载流子密度。
The through-plane conductivity of a film sample is critically important because it largely affects the performance of batteries, capacitors, and thermoelectric devices. In this study, we developed a modified four-probe through-plane electrical conductivity measurement method using a coaxial structure. This method is general and works for free-standing film samples. We studied different samples including a steel sheet, highly oriented pyrolytic graphite, and conducting polymers. We confirmed metallic transportation in the steel sheet and hopping transportation in graphite in the through-plane direction by conducting low temperature measurements at 100 K. In the case of a conducting polymer poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate, the conductivity anisotropic ratio decreases with increasing in-plane conductivity. Temperature dependent measurements show two distinct activation energy regimes in the through-plane direction in PEDOT/PSS but almost no change in the in-plane electrical conductivity activation energy. This could be due to additional carrier paths that occur through the more disordered region (the PSS-rich region) in the through-plane direction. We also examined the Meyer–Neldel rule in PEDOT/PSS and concluded that PEDOT/PSS follows the anti-Meyer–Neldel rule, likely due to the high carrier density in the film.