Zhu, DiAsatryan, JesikaPeinador Veiga, AlbertoMartín, JaimeMüller, Christian2026-06-052026-06-052026-05-26D. Zhu, J. Pons I Tarrés, J. Kimpel, M. Jha, M. Craighero, J. Asatryan, A. Peinador Veiga, Z. Liu, T. C. Hidalgo, M. M. Westwood, M. Fahlman, J. Martín, A. Giovannitti and C. Müller, Chem. Sci., 2026, 10.1039.D6SC01881E.2041-6539https://hdl.handle.net/2183/48534[Abstract]: Conjugated polymers with both oligoether and alkoxy side chains are an emerging type of organic mixed ionic-electronic conductor. Here, direct arylation polymerization is introduced as a viable synthetic route for such materials. The composition and molecular weight of the synthesized thienothiophene-based random copolymers are determined with high-temperature 1H NMR spectroscopy. Chemical and electrochemical doping of the copolymers reveal that the introduction of a minor fraction of alkoxy side chains results in materials with a highly promising set of electrical and mechanical properties. A copolymer with an alkoxy side-chain fraction of 12% features an electrical conductivity of 390 S cm−1 and a charge-carrier mobility of more than 3 cm2 V−1 s−1. Organic electrochemical transistors with a NaCl aqueous electrolyte feature a high figure of merit of 1313 F cm−1 V−1 s−1 thanks to a high volumetric capacitance of 417 F cm−3. Evidently, the introduction of a minor fraction of alkoxy side chains is a viable route for improving the electrical properties of organic mixed ionic-electronic conductors.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal articleopen access10.1039/d6sc01881e