Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 17, Pages 9368-9373Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202013998
Keywords
metal-free aldol condensation; n-type conjugated polymers; oligo(ethylene glycol) side chains; organic electrochemical transistors; rigid semiconducting polymers
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Funding
- King Abdullah University of Science and Technology Office of Sponsored Research (OSR) [OSR-2018-CARF/CCF-3079, OSR-2015-CRG4-2572, OSR- 2019-CRG8-4086]
- EC [610115, 643791]
- EPSRC [EP/G037515/1, EP/M005143/1, EP/L016702/1]
- National Science Foundation [NSF DMR-1751308]
- DOE Office of Science [DE-AC02-06CH11357]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) [ECCS-1542205]
- Materials Research Science and Engineering Center [NSF DMR-1720139]
- State of Illinois
- Northwestern University
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Rigid n-type conjugated polymers bearing OEG side chains demonstrated high electron mobility and excellent performance in OECT devices, achieving among the highest levels reported to date. The metal-free aldol-condensation polymerization used for synthesis is beneficial for their application in bioelectronics.
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 pi-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 mu 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.
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