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The role of the side chain on the performance of n-type conjugated polymers in aqueous electrolytes

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Title: The role of the side chain on the performance of n-type conjugated polymers in aqueous electrolytes
Authors: Giovannitti, A
Maria, I
Hanifi, D
Donahue, M
Bryant, D
Barth, K
Makdah, B
Savva, A
Moia, D
Zetek, M
Barnes, P
Reid, O
Inal, S
Rumbles, G
Malliaras, G
Nelson, J
Rivnay, J
McCulloch, I
Item Type: Journal Article
Abstract: We report a design strategy that allows the preparation of solution processable n type materials from low boiling point solvents for organic electrochemical transistors (OECTs). The polymer backbone is based on NDI-T2 copolymers where a branched alkyl side chain is gradually exchanged for a linear ethylene glycol based side chain. A series of random copolymers are prepared with glycol side chain percentages of 0, 10, 25, 50, 75, 90 and 100 with respect to the alkyl side chains. These are characterized in order to study the influence of the polar side chains on interaction with aqueous electrolytes, their electrochemical redox reactions and performance in OECTs when operated in aqueous electrolytes. We observe that glycol side chain percentages of >50 % are required to achieve volumetric charging while lower glycol chain percentages show a mixed operation with high required voltages to allow for bulk charging of the organic semiconductor. A strong dependence of the electron mobility on the fraction of glycol chains was found for copolymers based on NDI-T2, with a significant drop as alkyl side chains are replaced by glycol side chains.
Issue Date: 24-Apr-2018
Date of Acceptance: 10-Apr-2018
URI: http://hdl.handle.net/10044/1/58984
DOI: https://dx.doi.org/10.1021/acs.chemmater.8b00321
ISSN: 0897-4756
Publisher: American Chemical Society
Start Page: 2945
End Page: 2953
Journal / Book Title: Chemistry of Materials
Volume: 30
Issue: 9
Copyright Statement: © 2018 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Sponsor/Funder: Commission of the European Communities
Commission of the European Communities
Engineering & Physical Science Research Council (E
Engineering and Physical Sciences Research Council
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: 610115
643791
RG73951
EP/G037515/1
N/A
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Chemistry
Materials Science
ORGANIC ELECTROCHEMICAL TRANSISTORS
OLIGO(ETHYLENE GLYCOL)
CHARGE-TRANSPORT
CONDUCTING POLYMERS
SOLID-STATE
MOBILITY
DEVICES
FILMS
SEMICONDUCTORS
STABILITY
03 Chemical Sciences
09 Engineering
Materials
Publication Status: Published
Online Publication Date: 2018-04-24
Appears in Collections:Physics
Chemistry
Experimental Solid State
Centre for Environmental Policy
Faculty of Natural Sciences



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