Tailoring the Seebeck Coefficient of PEDOT:PSS by
Controlling Ion Stoichiometry in Ionic Liquid Additives
Version 2 2018-07-11, 19:13
Version 1 2018-07-11, 18:25
Posted on 2018-07-11 - 19:13
Mixing simple additives into poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate)
(PEDOT:PSS) dispersions can greatly enhance the thermoelectric properties
of the cast films with little manufacturing cost, but design rules
for many of these additives have yet to emerge. We show that controlling
stoichiometry in ionic liquid (I.L.) additives can decouple morphological
and electronic modifications to PEDOT:PSS and enhance its power
factor by over 2 orders of magnitude. Blending I.L. additives with
a 1:1 stoichiometry between cationic imidazolium (Im+)
derivatives and anionic bis(trifluoromethane)sulfonamide (TFSI–) groups into PEDOT:PSS dispersions raised the film
conductivity to ∼1000 S/cm. The Seebeck coefficient, which
gives insight into the electronic structure as well as thermoelectric
performance, remained unchanged. This behavior mimics that of popular
high-boiling solvent additives such as dimethyl sulfoxide and ethylene
glycol, which restructure the film morphology to enhance carrier mobility.
Blending I.L. additives with a 4:1 stoichiometry between Im+ and TFSI– groups raises the conductivity in a
similar manner but also enhances the Seebeck coefficient. This selective
Seebeck enhancement proceeds from the interaction of excess Im+ with anionic poly(styrenesulfonate) (PSS–) groups, similar to previous studies using inorganic salts, that
results in a shift in charge carrier populations. Inorganic salts
by themselves cannot raise the conductivity of PEDOT:PSS to appropriate
values since they lack the solvent restructuring effect. These I.L.
additives combine the effects of high-boiling solvents and diffuse
ions, with the ability to tailor the Seebeck coefficient through ion
stoichiometry.
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Mazaheripour, Amir; Majumdar, Shubhaditya; Hanemann-Rawlings, Dakota; Thomas, Elayne M.; McGuiness, Christine; d’Alencon, Lauriane; et al. (2018). Tailoring the Seebeck Coefficient of PEDOT:PSS by
Controlling Ion Stoichiometry in Ionic Liquid Additives. ACS Publications. Collection. https://doi.org/10.1021/acs.chemmater.8b02114
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AUTHORS (8)
AM
Amir Mazaheripour
SM
Shubhaditya Majumdar
DH
Dakota Hanemann-Rawlings
ET
Elayne M. Thomas
CM
Christine McGuiness
Ld
Lauriane d’Alencon
MC
Michael L. Chabinyc
RS
Rachel A. Segalman