Investigation of the thermoelectric response in conducting polymers doped by solid-state diffusion
Investigation of the thermoelectric response in conducting polymers doped by solid-state diffusion
复制标题
DOI：
10.1016/j.mtphys.2019.02.004
复制
发表时间：
2019-03-01
影响因子：
11.5
通讯作者：
Sirringhaus, H.
中科院分区：
文献类型：
--
作者：
Kang, K.;Schott, S.;Sirringhaus, H.
热电效应是一种将载流子的热能与其电荷输运关系复杂的物理现象。了解不同系统中这种相互作用的机制是发明可以彻底改变热电发电技术的新材料的核心。尽管近年来人们对有机热电材料的兴趣激增，但由于存在很大程度的无序性，在制定电荷输运机制方面存在困难。本文基于输运函数能量依赖幂律的输运模型，分析了掺杂分子固态扩散掺杂的各种导电聚合物的热电性质。通过掺杂后退火对掺杂程度的精细控制为导电聚合物中载流子迁移率的强能量依赖性提供了准确的经验证据。通过固态扩散掺杂的导电聚合物的热电功率因数优于其他掺杂方法，可归因于由此产生的更高的固有迁移率和更高的自由载流子浓度。(C) 2019 Elsevier Ltd.版权所有。
Thermoelectric effect is a physical phenomenon which intricately relates the thermal energy of charge carriers to their charge transport. Understanding the mechanism of this interaction in different systems lies at the heart of inventing novel materials which can revolutionize thermoelectric power generation technology. Despite the recent surge of interest in organic thermoelectric materials, the community has had difficulties in formulating the charge transport mechanism in the presence of a significant degree of disorder. Here, we analyze the thermoelectric properties of various conducting polymers doped by solid-state diffusion of dopant molecules based on a transport model with a power law energy dependence of transport function. A fine control of the degree of doping via postdoping annealing provides an accurate empirical evidence of a strong energy dependence of the carrier mobility in the conducting polymers. A superior thermoelectric power factor of conducting polymers doped by solid-state diffusion to that of other doping methods can be attributed to a resulting higher intrinsic mobility and higher free carrier concentration. (C) 2019 Elsevier Ltd. All rights reserved.