热电效应
材料科学
掺杂剂
兴奋剂
载流子
热电材料
塞贝克系数
导电聚合物
聚合物
化学物理
热电发电机
纳米技术
工程物理
光电子学
热力学
复合材料
化学
热导率
物理
工程类
作者
Keehoon Kang,Sam Schott,Deepak Venkateshvaran,Katharina Broch,Guillaume Schweicher,David Harkin,Cameron Jellett,Christian B. Nielsen,Iain McCulloch,Henning Sirringhaus
标识
DOI:10.1016/j.mtphys.2019.02.004
摘要
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.
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