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
Author(s): 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.
Publication Date: 8-May-2018
Date of Acceptance: 10-Apr-2018
URI: http://hdl.handle.net/10044/1/58984
ISSN: 0897-4756
Publisher: American Chemical Society
Journal / Book Title: Chemistry of Materials
Copyright Statement: This paper is embargoed until publication. Once published it will be available fully open access.
Sponsor/Funder: Commission of the European Communities
Commission of the European Communities
Engineering & Physical Science Research Council (E
Engineering and Physical Sciences Research Council
Funder's Grant Number: 610115
643791
RG73951
EP/G037515/1
Keywords: 03 Chemical Sciences
09 Engineering
Materials
Publication Status: Accepted
Embargo Date: publication subject to indefinite embargo
Appears in Collections:Physics
Chemistry
Experimental Solid State
Faculty of Natural Sciences



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