High Electron Mobility in Conjugated Polymers Processed with Nonchlorinated Solvents for Organic Thin Film Transistors

作者：Qian Che, Xuyang Wei, Weifeng Zhang, Hao Luo, C.Y. Cui, Shuai Yang, Jiadi Chen, Zhihui Chen, Liping Wang, Gui Yu · 发表于：ACS Applied Polymer Materials · 年份：2025 · DOI：10.1021/acsapm.5c01022 · 被引用次数：6 · 研究领域：Organic Electronics and Photovoltaics、Conducting polymers and applications、Organic Light-Emitting Diodes Research

Herein, we report a series of conjugated polymers P1 – P4, which were synthesized through aldol polymerization using toluene as the solvent and p -toluene sulfonic acid as the sole catalyst. We investigated their solubility, optical and electrochemical properties, wettability, and aggregation behaviors in (or treated with) 2-methyltetrahydrofuran (2-MeTHF) and o -dichlorobenzene ( o -DCB). We found that the 2-MeTHF-treated thin films of P1 – P4 have slightly different frontier molecular orbital energy levels in comparison with those of their o -DCB-treated counterparts, respectively. Moreover, 2-MeTHF-processed organic thin film transistors (OTFTs) based on these polymers exhibited a higher n-type transport performance. Notably, the P2 -based device afforded the maximum electron mobility of 3.14 cm 2 V –1 s –1, which is among the highest for the n-type polymer-based OTFTs processed with nonchlorinated solvents to date. Microstructure characterizations further revealed that all these 2-MeTHF-treated thin films have enhanced film morphology and molecular orientation stacking compared to those of their respective o -DCB-treated ones.