Balancing Ionic and Electronic Conduction for High-Performance Organic Electrochemical Transistors
Hidalgo, Tania C.
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
KAUST Solar Center (KSC)
Organic Bioelectronics Laboratory; Biological and Environmental Science and Engineering; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
Physical Sciences and Engineering (PSE) Division
Chemical Science Program
Embargo End Date2021-01-28
Permanent link to this recordhttp://hdl.handle.net/10754/661327
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AbstractConjugated polymers that support mixed (electronic and ionic) conduc-tion are in demand for applications spanning from bioelectronics to energy harvesting and storage. To design polymer mixed conductors for high-perfor-mance electrochemical devices, relationships between the chemical structure, charge transport, and morphology must be established. A polymer series bearing the same p-type conjugated backbone with increasing percentage of hydrophilic, ethylene glycol side chains is synthesized, and their performance in aqueous electrolyte gated organic electrochemical transistors (OECTs) is studied. By using device physics principles and electrochemical analyses, a direct relationship is found between the OECT performance and the balanced mixed conduction. While hydrophilic side chains are required to facilitate ion transport—thus enabling OECT operation—swelling of the polymer is not de facto beneficial for balancing mixed conduction. It is shown that heteroge-neous water uptake disrupts the electronic conductivity of the film, leading to OECTs with lower transconductance and slower response times. The combination of in situ electrochemical and structural techniques shown here contributes to the establishment of the structure–property relations necessary to improve the performance of polymer mixed conductors and subsequently of OECTs.
CitationSavva, A., Hallani, R., Cendra, C., Surgailis, J., Hidalgo, T. C., Wustoni, S., … Inal, S. (2020). Balancing Ionic and Electronic Conduction for High-Performance Organic Electrochemical Transistors. Advanced Functional Materials, 1907657. doi:10.1002/adfm.201907657
SponsorsThe authors would like to thank Mahmood H. Akhtar for assistance in microfabrication and Long Chen for assistance in AFM measurements. Figure 5 and the TOC image were produced by Heno Hwang, scientific illustrator at King Abdullah University of Science and Technology (KAUST). Portions of this research were carried out at the Stanford Synchrotron Radiation Lightsource, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences.
JournalAdvanced Functional Materials