CC BY-NC-ND 4.0 · Organic Materials 2021; 03(01): 001-016
DOI: 10.1055/s-0040-1722305
Short Review

Controlling the Film Microstructure in Organic Thermoelectrics

a   College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
,
a   College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
,
a   College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
› Author Affiliations
Funding Information This work is supported by the National Key R&D Program of China (2017YFA0204701) and the National Natural Science Foundation of China (21790260, 21722201).


Abstract

Doping is a vital method to increase the charge carrier concentration of conjugated polymers, thus improving the performance of organic electronic devices. However, the introduction of dopants may cause phase separation. The miscibility of dopants and polymers as well as the doping-induced microstructure change are always the barriers in the way to further enhance the thermoelectrical performance. Here, recent research studies about the influence of molecular doping on the microstructures of conjugated polymers are summarized, with an emphasis on the n-type doping. Highlighted topics include how to control the distribution and density of dopants within the conjugated polymers by modulating the polymer structure, dopant structure, and solution-processing method. The strong Coulombic interactions between dopants and polymers as well as the heterogeneous doping process of polymers can hinder the polymer film to achieve better miscibility of dopants/polymer and further loading of the charge carriers. Recent developments and breakthroughs provide guidance to control the film microstructures in the doping process and achieve high-performance thermoelectrical materials.



Publication History

Received: 08 October 2020

Accepted: 09 December 2020

Article published online:
11 January 2021

© 2021. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany