Enhanced Molecular Doping for High Conductivity in Polymers with Volume Freed for Dopants

• DOI: 10.1021/acs.macromol.9b02048
• Publication Date: 2019-12-05T19:41:11Z
• Authors: Hui Li; Mallory E. DeCoster; Chen Ming; Mengdi Wang; Yanling Chen; Patrick E. Hopkins; Lidong Chen; Howard E. Katz
• Keywords: Side chain; Polythiophene

We present two new polythiophene isomers, PQTC16-TT and PQTSC16-TT, with more separation lower side chain density on the backbone compared typical polythiophenes, such as PQT(S)12 PBTTT(S)12. The introduction of spacer subunits to separate chains improves accommodation dopant molecules close polymer backbone. Therefore, lamellar structure π–π stacking polymers were negligibly disturbed by dopants; in fact, improved ordering closer π-stacking observed after chemical doping. Furthermore, doping efficiency is significantly enhanced electrical conductivity up 330 S cm–1, still maintained at 200 cm–1 higher concentration, for combination PQTSC16-TT/NOBF4. investigate how charge transfer affected geometry respect repeat unit. It shown that sulfurs act binding sites dopants, resulting thermal environmental stability alkylthio-substituted upon