Modification of the Poly(bisdodecylquaterthiophene) Structure for High and Predominantly Nonionic Conductivity with Matched Dopants

• DOI: 10.1021/jacs.7b05300
• Publication Date: 2017-07-24T11:57:17Z
• Authors: Hui Li; Mallory E. DeCoster; Robert M. Ireland; Jian Song; Patrick E. Hopkins; Howard E. Katz
• Keywords: Ethylenedioxy

Four p-type polymers were synthesized by modifying poly(bisdodecylquaterthiophene) (PQT12) to increase oxidizability p-dopants. A sulfur atom is inserted between the thiophene rings and dodecyl chains, and/or 3,4-ethylenedioxy groups are appended of PQT12. Doped with NOBF4, PQTS12 (with in side chains) shows a conductivity 350 S cm-1, highest reported nonionic among films made from dopant-polymer solutions. tetrafluorotetracyanoquinodimethane (F4TCNQ), PDTDE12 on rings) 140 cm-1. The converse combinations polymer dopant formulations using both ethylenedioxy modifications showed lower conductivities. conductivities stable air without extrinsic ion contributions associated PEDOT:PSS that cannot support sustained current or thermoelectric voltage. Efficient charge transfer, tighter π-π stacking, strong intermolecular coupling responsible for conductivity. Values nontransient Seebeck coefficient agree empirical modeling materials these levels pure hole conductivity; power factor compares favorably prior alternative process immersion into Models point significant mobility increases induced dopants order 1-5 cm2 V-1 s-1, supported field-effect transistor studies slightly doped samples. thermal range 0.2-0.5 W m-1 K-1, typical conductive polymers. results further enhancements could be obtained increasing mobilities.