Correlating the Seebeck coefficient of thermoelectric polymer thin films to their charge transport mechanism
Correlating the Seebeck coefficient of thermoelectric polymer thin films to their charge transport mechanism
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DOI：
10.1016/j.orgel.2017.11.018
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发表时间：
2018
影响因子：
3.2
通讯作者：
I. Petsagkourakis;E. Pavlopoulou;É. Cloutet;Yan Chen;X.J. Liu;M. Fahlman;M. Berggren;X. Crispin;S. Dilhaire;G. Fleury;G. Hadziioannou
中科院分区：
文献类型：
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作者：
I. Petsagkourakis;E. Pavlopoulou;É. Cloutet;Yan Chen;X.J. Liu;M. Fahlman;M. Berggren;X. Crispin;S. Dilhaire;G. Fleury;G. Hadziioannou
基于导电聚合物的室温柔性集热器非常适合满足现代游牧社会的能源需求。其热电效率的优化通常是通过调节导电聚合物的氧化水平来寻求的，即使这种方法不利于塞贝克系数(S)，因为塞贝克系数和电导率(σ)都与载流子浓度相反。在本文中，我们报道了Sandσ的同时增加，并首次实验推导了有机电子中Seebeck系数与载流子迁移率的关系。通过对导电聚合物合成的特定控制，我们能够形成更密集的渗流网络，促进导电聚合物层内载流子的电荷传输和热扩散，同时随着结晶度的增加，材料从费米玻璃向半金属移动。这项工作揭示了导电聚合物热电性能的起源，但也强调了增强载流子迁移率对于设计高效热电聚合物的重要性。
Room temperature flexible heat harvesters based on conducting polymers are ideally suited to cover the energy demands of the modern nomadic society. The optimization of their thermoelectric efficiency is usually sought by tuning the oxidation levels of the conducting polymers, even if such methodology is detrimental to the Seebeck coefficient (S) as both the Seebeck coefficient and the electrical conductivity (σ) are antagonistically related to the carrier concentration. Here we report a concurrent increase ofSandσand we experimentally derive the dependence of Seebeck coefficient on charge carrier mobility for the first time in organic electronics. Through specific control of the conducting polymer synthesis, we enabled the formation of a denser percolation network that facilitated the charge transport and the thermodiffusion of the charge carriers inside the conducting polymer layer, while the material shifted from a Fermi glass towards a semi-metal, as its crystallinity increased. This work sheds light upon the origin of the thermoelectric properties of conducting polymers, but also underlines the importance of enhanced charge carrier mobility for the design of efficient thermoelectric polymers.