A chemical kinetics perspective on thermoelectric transport
A chemical kinetics perspective on thermoelectric transport
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DOI：
10.1063/5.0055367
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发表时间：
2021-08-09
影响因子：
4
通讯作者：
Katz, Howard E.
中科院分区：
文献类型：
--
作者：
Chen, Nan (Louise);Pino, Juan;Katz, Howard E.
有越来越多的化学家和材料科学家探索有机，聚合物，混合和复合材料的热电性能。这些材料中的许多是非简并半导体，这意味着费米能级和传输电荷传输能级显著偏移。其他的是离子导体。虽然基本参数的含义，即电导率（σ）和塞贝克系数（S，每度温差的电压差）是可以理解的，但S的起源对于主要接受化学训练的人来说并不明显。这份手稿的目的是说明S是两种电荷载体的浓度之间的稳态差异的结果，这些电荷载体在材料样品的较热侧和较冷侧，类似于焓和熵不同的相互转换的化学物质之间的平衡。基于离子的塞贝克系数，也被称为索雷特效应，可以使用与适用于电子和空穴的原理类似的原理来解释。我们希望这种分析能够通过使用化学动力学和热力学语言的解释以及对新兴材料中热电效率可以提高的方式的理解来更广泛地理解S的起源。
There is a growing community of chemists and materials scientists exploring thermoelectric properties of organic, polymeric, hybrid, and composite materials. Many of these materials are nondegenerate semiconductors, meaning that the Fermi and transport charge transport energy levels are significantly offset. Others are ionic conductors. While the meaning of the essential parameters, namely, electrical conductivity (sigma) and Seebeck coefficient (S, the voltage difference per degree of temperature difference) are accessible, the origins of S are not readily apparent to one trained mainly in chemistry. The purpose of this manuscript is to illustrate S as being the result of a steady state difference between concentrations of two designations of charge carriers, those on hotter and those on colder sides of a material sample, analogous to the equilibrium among interconverting chemical species that differ in enthalpy and entropy. The ion-based Seebeck coefficient, also known as the Soret effect, can be explained using principles similar to those applicable to electrons and holes. We hope that this analysis leads to wider understanding of the origins of S through an explanation using the language of chemical kinetics and thermodynamics and appreciation of ways that thermoelectric efficiency can be enhanced in emerging materials.