Replacement of toxic chlorinated solvents with eco- and human-friendly solvents is an important task for the successful implemention of next-generation polymer electronics technology. Herein, we designed and synthesized five aqueous-alcohol-processable conjugated copolymers by incorporating linear or branched oligo(ethylene glycol) side chains and systematically investigated their material and electronic properties. The resulting benzothiadiazole-based donor-acceptor alternating copolymers were well-soluble in both an ethanol/water mixed solvent and a chlorinated solvent, and their thin films showed distinct morphologies and crystalline characteristics that resulted from the self-assembling properties of the engineered side chains. Moreover, the copolymers showed excellent electrical characteristics with high hole mobilities of up to 0.1 cm2 V-1 s-1, which is among the highest values reported thus far for polymer field-effect transistors processed using truly eco- and human-friendly solvents without the use of any surfactants. These results clearly demonstrate the immense potential of branched oligo(ethylene glycol) side chains for application in green electronics.
Bibliographical noteFunding Information:
This work was supported by a grant from the Creative Materials Discovery Program (NRF-2019M3D1A1078296) through the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT, Korea and the Materials & Components Technology Development Program (20006537, Development of High Performance Insulation Materials for Flexible OLED Display TFT) funded by the Ministry of Trade, Industry & Energy (MOTIE), Korea. H.Y.W. acknowledges the financial support by the National Research Foundation (NRF) of Korea (2019R1A2C2085290, 2019R1A6A1A11044070).
Copyright © 2019 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Chemistry