Enhancing the Thermoelectric Properties of Conjugated Polymers by Suppressing Dopant‐Induced Disorder

• DOI: 10.1002/adma.202314062
• Publication Date: 2024-04-01T15:30:11Z
• Authors: Suhao Wang; Wenjin Zhu; Ian E. Jacobs; William A. Wood; Zichen Wang; Suraj Manikandan; Jens Wenzel Andre...; Hio‐Ieng Un; Sarah Ursel; Sébastien Peralta; Shaoliang Guan; Jean‐Claude Grivel; Stéphane Longuemart; Henning Sirringhaus
• Keywords: Polythiophene; Electron Mobility; Bipolaron; Organic Electronics

Abstract Doping is a crucial strategy to enhance the performance of various organic electronic devices. However, in many cases, random distribution dopants conjugated polymers leads disruption polymer microstructure, severely constraining achievable Here, it shown that by ion‐exchange doping polythiophene‐based P[(3HT) 1‐x ‐stat‐(T) x ] ( = 0 (P1), 0.12 (P2), 0.24 (P3), and 0.36 (P4)), remarkably high electrical conductivity >400 S cm −1 power factor >16 µW m K −2 are achieved for copolymer P3, ranking among highest ever reported unaligned P3HT‐based films, significantly higher than P1 (<40 , <4 ). Although both exhibit comparable field‐effect transistor hole mobilities ≈0.1 2 V s pristine state, after doping, Hall effect measurements indicate P3 exhibits large mobility up 1.2 outperforming (0.06 GIWAXS measurement determines in‐plane π – stacking distance doped 3.44 Å, distinctly shorter (3.68 Å). These findings contribute resolving long‐standing dopant‐induced‐disorder issues P3HT serve as an example achieving fast charge transport highly efficient electronics.