Mixed Conduction in an N-Type Organic Semiconductor in the Absence of Hydrophilic Side-Chains
Mixed Conduction in an N-Type Organic Semiconductor in the Absence of Hydrophilic Side-Chains.pdf
Paulsen, Bryan D.
KAUST DepartmentBioengineering Program
Biological and Environmental Science and Engineering (BESE) Division
Biological and Environmental Science and Engineering Division Organic Bioelectronics Laboratory King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia
Chemical Science Program
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
KAUST Grant NumberOSR-2016-CRG5-3003
Online Publication Date2021-03-18
Print Publication Date2021-05
Embargo End Date2022-03-18
Permanent link to this recordhttp://hdl.handle.net/10754/668162
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AbstractOrganic electrochemical transistors (OECTs) are the building blocks of biosensors, neuromorphic devices, and complementary circuits. One rule in the materials design for OECTs is the inclusion of a hydrophilic component in the chemical structure to enable ion transport in the film. Here, it is shown that the ladder-type, side-chain free polymer poly(benzimidazobenzophenanthroline) (BBL) performs significantly better in OECTs than the donor–acceptor type copolymer bearing hydrophilic ethylene glycol side chains (P-90). A combination of electrochemical techniques reveals that BBL exhibits a more efficient ion-to-electron coupling and higher OECT mobility than P-90. In situ atomic force microscopy scans evidence that BBL, which swells negligibly in electrolytes, undergoes a drastic and permanent change in morphology upon electrochemical doping. In contrast, P-90 substantially swells when immersed in electrolytes and shows moderate morphology changes induced by dopant ions. Ex situ grazing incidence wide-angle X-ray scattering suggests that the particular packing of BBL crystallites is minimally affected after doping, in contrast to P-90. BBL's ability to show exceptional mixed transport is due to the crystallites’ connectivity, which resists water uptake. This side chain-free route for the design of mixed conductors could bring the n-type OECT performance closer to the bar set by their p-type counterparts.
CitationSurgailis, J., Savva, A., Druet, V., Paulsen, B. D., Wu, R., Hamidi-Sakr, A., … Inal, S. (2021). Mixed Conduction in an N-Type Organic Semiconductor in the Absence of Hydrophilic Side-Chains. Advanced Functional Materials, 2010165. doi:10.1002/adfm.202010165
SponsorsThe research reported in this publication was supported by funding from KAUST, Office of Sponsored Research (OSR), under award number OSR-2016-CRG5-3003, URF/1/4073-01 and OSR-2018-CRG7-3709. J. S. thanks Dr. Yi Zhang for the TEM image of P-90. B.D.P., R.W., and J.R. gratefully acknowledge support from the National Science Foundation Grant No. NSF DMR-1751308. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The authors would like to thank Joseph Strzalka and Qingteng Zhang for beam line assistance.
JournalAdvanced Functional Materials