title: A Solution-Doped Polymer Semiconductor:Insulator Blend for Thermoelectrics.
abstract: Poly(ethylene oxide) is demonstrated to be a suitable matrix polymer for the solution-doped conjugated polymer poly(3-hexylthiophene). The polarity of the insulator combined with carefully chosen processing conditions permits the fabrication of tens of micrometer-thick films that feature a fine distribution of the F4TCNQ dopant:semiconductor complex. Changes in electrical conductivity from 0.1 to 0.3 S cm-1and Seebeck coefficient from 100 to 60 μV K-1upon addition of the insulator correlate with an increase in doping efficiency from 20% to 40% for heavily doped ternary blends. An invariant bulk thermal conductivity of about 0.3 W m-1K-1gives rise to a thermoelectric Figure of meritZT∼ 10-4that remains unaltered for an insulator content of more than 60 wt%. Free-standing, mechanically robust tapes illustrate the versatility of the developed dopant:semiconductor:insulator ternary blends.
authors.affiliation: Department of Chemistry and Chemical Engineering Chalmers University of Technology 41296 Göteborg Sweden.
authors.forename: David
authors.initials: D
authors.lastname: Kiefer
authors.affiliation: Department of Chemistry and Chemical Engineering Chalmers University of Technology 41296 Göteborg Sweden; Physical Sciences & Engineering Division, and KAUST Solar Center (KSC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia.
authors.forename: Liyang
authors.initials: L
authors.lastname: Yu
authors.affiliation: Department of Physics Chalmers University of Technology 41296 Göteborg Sweden.
authors.forename: Erik
authors.initials: E
authors.lastname: Fransson
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) Esfera de la UAB 08193 Bellaterra Spain.
authors.forename: Andrés
authors.initials: A
authors.lastname: Gómez
authors.affiliation: Department of Physics and Astronomy Uppsala University 75120 Uppsala Sweden.
authors.forename: Daniel
authors.initials: D
authors.lastname: Primetzhofer
authors.affiliation: Physical Sciences & Engineering Division, and KAUST Solar Center (KSC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia.
authors.forename: Aram
authors.initials: A
authors.lastname: Amassian
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) Esfera de la UAB 08193 Bellaterra Spain.
authors.forename: Mariano
authors.initials: M
authors.lastname: Campoy-Quiles
authors.affiliation: Department of Chemistry and Chemical Engineering Chalmers University of Technology 41296 Göteborg Sweden.
authors.forename: Christian
authors.initials: C
authors.lastname: Müller
keywords: conjugated polymers; insulators; molecular dopants; organic thermoelectrics; semiconductors; ternary blend