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n ‐Type Rigid Semiconducting Polymers Bearing Oligo(Ethylene Glycol) Side Chains for High‐Performance Organic Electrochemical Transistors
Author(s) -
Chen Xingxing,
Marks Adam,
Paulsen Bryan D.,
Wu Ruiheng,
Rashid Reem B.,
Chen Hu,
Alsufyani Maryam,
Rivnay Jonathan,
McCulloch Iain
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202013998
Subject(s) - conjugated system , ethylene glycol , polymer , side chain , materials science , homo/lumo , polymer chemistry , arylene , electrochemistry , polymerization , organic electronics , electron mobility , chemistry , transistor , organic chemistry , electrode , aryl , optoelectronics , alkyl , molecule , physics , voltage , quantum mechanics , composite material
N‐type conjugated polymers as the semiconducting component of organic electrochemical transistors (OECTs) are still undeveloped with respect to their p‐type counterparts. Herein, we report two rigid n‐type conjugated polymers bearing oligo(ethylene glycol) (OEG) side chains, PgNaN and PgNgN, which demonstrated an essentially torsion‐free π‐conjugated backbone. The planarity and electron‐deficient rigid structures enable the resulting polymers to achieve high electron mobility in an OECT device of up to the 10 −3 cm 2 V −1 s −1 range, with a deep‐lying LUMO energy level lower than −4.0 eV. Prominently, the polymers exhibited a high device performance with a maximum dimensionally normalized transconductance of 0.212 S cm −1 and the product of charge‐carrier mobility μ and volumetric capacitance C* of 0.662±0.113 F cm −1 V −1 s −1 , which are among the highest in n‐type conjugated polymers reported to date. Moreover, the polymers are synthesized via a metal‐free aldol‐condensation polymerization, which is beneficial to their application in bioelectronics.