N-type Rigid Semiconducting Polymers Bearing Oligo(Ethylene Glycol) Side Chains for High Performance Organic Electrochemical Transistors

Xingxing Chen, Adam Marks, Bryan D. Paulsen, Ruiheng Wu, Reem B. Rashid, Hu Chen, Maryam Alsufyani, Jonathan Rivnay, Iain McCulloch

Research output: Contribution to journalArticlepeer-review

Abstract

N-type conjugated polymers as the semiconducting component of organic electrochemical transistors (OECTs) are still undeveloped with respect to the p-type counterparts. Herein, we first 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 10 -3 cm 2 V -1 s -1 range, with a deep-lying lowest unoccupied molecular orbital (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. Our work proves a new way for designing glycolated n-type conjugated polymers with low-lying LUMO and conformation-locked backbones for high performance OECTs.
Original languageEnglish (US)
JournalAngewandte Chemie
DOIs
StatePublished - Dec 24 2020

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