Electrochemical Investigations of the N‑Type
Semiconducting Polymer P(NDI2OD-T2) and Its Monomer: New Insights
in the Reduction Behavior
Daniel Trefz
Adrian Ruff
Roman Tkachov
Matthias Wieland
Miriam Goll
Anton Kiriy
Sabine Ludwigs
10.1021/acs.jpcc.5b05756.s001
https://acs.figshare.com/articles/journal_contribution/Electrochemical_Investigations_of_the_N_Type_Semiconducting_Polymer_P_NDI2OD_T2_and_Its_Monomer_New_Insights_in_the_Reduction_Behavior/2124022
This
manuscript provides the first systematic characterization
of the electrochemical properties of the high mobility n-type polymer
poly{[<i>N</i>,<i>N</i>′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis
(dicarboximide)-2,6-diyl]-<i>alt</i>-5,5′-(2,2′-bithiophene)}
(P(NDI2OD-T2)) and its corresponding monomer 2,6-bis(2-bromothien-5-yl)naphthalene-1,4,5,8-tetracarboxylic-<i>N</i>,<i>N</i>′-bis(2-octyldodecyl) diimide
(Br-NDI2OD-T2-Br) by cyclic voltammetry and in situ spectroelectrochemistry.
Both monomer and polymer reveal a 2-fold reduction to the dianion
via a radical anion species. The comparison between monomeric and
polymeric species allows the explanation of the electrochemical behavior
of P(NDI2OD-T2) according to redox polymers with localization of charges
on the naphthalene bisimide unit. Measurements with electrolyte gated
transistors suggest electron hopping transport according to mixed
valence conductivity. In the last section of this paper we discuss
a significant first cycle effect upon electrochemical reduction which
had not been reported for n-type polymers before. The effect is even
more pronounced for samples with controlled morphology, that is, high
amounts of aggregation in the films. In agreement with solution experiments
we attribute the appearance of the signal at −1.04 V (<i>E</i><sub>1/2</sub> = −1.00 V) to the radical anion form
of the solvated species.
2015-10-08 00:00:00
monomer
cyclic voltammetry
electrochemical properties
solvated species
Electrochemical Investigations
anion form
redox polymers
anion species
New Insights
2OD
electrolyte gated transistors
Reduction BehaviorThis manuscript
naphthalene bisimide unit
cycle effect
valence conductivity
electrochemical behavior
solution experiments
electrochemical reduction