title: Acido-basic control of the thermoelectric properties of poly(3,4-ethylenedioxythiophene)tosylate (PEDOT-Tos) thin films.
abstract: PEDOT-Tos is one of the conducting polymers that displays the most promising thermoelectric properties. Until now, it has been utterly difficult to control all the synthesis parameters and the morphology governing the thermoelectric properties. To improve our understanding of this material, we study the variation in the thermoelectric properties by a simple acido-basic treatment. The emphasis of this study is to elucidate the chemical changes induced by acid (HCl) or base (NaOH) treatment in PEDOT-Tos thin films using various spectroscopic and structural techniques. We could identify changes in the nanoscale morphology due to anion exchange between tosylate and Cl-or OH-. But, we identified that changing the pH leads to a tuning of the oxidation level of the polymer, which can explain the changes in thermoelectric properties. Hence, a simple acid-base treatment allows finding the optimum for the power factor in PEDOT-Tos thin films.
authors.affiliation: Department of Science and Technology , Linköping University , Campus Norrköping , S-60174 Norrköping , Sweden . Email: xavier.crispin@liu.se.
authors.forename: Zia Ullah
authors.initials: ZU
authors.lastname: Khan
authors.affiliation: Department of Science and Technology , Linköping University , Campus Norrköping , S-60174 Norrköping , Sweden . Email: xavier.crispin@liu.se; Optoelectronics Group , Cavendish Laboratory , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , UK.
authors.forename: Olga
authors.initials: O
authors.lastname: Bubnova
authors.affiliation: Department of Physics , Chemistry and Biology , Linköping University , S-581 83 Linköping , Sweden.
authors.forename: Mohammad Javad
authors.initials: MJ
authors.lastname: Jafari
authors.affiliation: Department of Science and Technology , Linköping University , Campus Norrköping , S-60174 Norrköping , Sweden . Email: xavier.crispin@liu.se; University of South Australia , Mawson Institute , Mawson Lakes 5095 , Australia.
authors.forename: Robert
authors.initials: R
authors.lastname: Brooke
authors.affiliation: Department of Physics , Chemistry and Biology , Linköping University , S-581 83 Linköping , Sweden.
authors.forename: Xianjie
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Science and Technology , Linköping University , Campus Norrköping , S-60174 Norrköping , Sweden . Email: xavier.crispin@liu.se.
authors.forename: Roger
authors.initials: R
authors.lastname: Gabrielsson
authors.affiliation: Department of Physics , Chemistry and Biology , Linköping University , S-581 83 Linköping , Sweden.
authors.forename: Thomas
authors.initials: T
authors.lastname: Ederth
authors.affiliation: University of South Australia , Mawson Institute , Mawson Lakes 5095 , Australia.
authors.forename: Drew R
authors.initials: DR
authors.lastname: Evans
authors.affiliation: Technical University of Denmark , Department of Energy Conversion and Storage , Frederiksborgvej 399 , 4000 Roskilde , Denmark.
authors.forename: Jens W
authors.initials: JW
authors.lastname: Andreasen
authors.affiliation: Department of Physics , Chemistry and Biology , Linköping University , S-581 83 Linköping , Sweden.
authors.forename: Mats
authors.initials: M
authors.lastname: Fahlman
authors.affiliation: Department of Science and Technology , Linköping University , Campus Norrköping , S-60174 Norrköping , Sweden . Email: xavier.crispin@liu.se.
authors.forename: Xavier
authors.initials: X
authors.lastname: Crispin