| Title: |
Salts as Additives: A Route to Improve Performance and Stability of n-Type Organic Electrochemical Transistors |
| Authors: |
Ohayon, David; Flagg, Lucas Q.; Giugni, Andrea; Wustoni, Shofarul; Li, Ruipeng; Hidalgo, Tania C.; Emwas, Abdul-Hamid M.; Sheelamanthula, Rajendar; McCulloch, Iain; Richter, Lee J.; Inal, Sahika |
| Contributors: |
Organic Bioelectronics Laboratory, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia; Core Laboratories, KAUST, Thuwal 23955-6900, Saudi Arabia; Bioscience Program; Biological and Environmental Science and Engineering (BESE) Division; NMR; Advanced Membranes and Porous Materials Research Center; KAUST Solar Center (KSC); Physical Science and Engineering (PSE) Division; Chemical Science Program; Bioengineering Program; Materials Science and Engineering Division, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, United States; Department of Physics, Università degli Studi di Milano, Via Celoria 16, I-20133 Milano, Italy; National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States; Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, United Kingdom |
| Publisher Information: |
American Chemical Society (ACS) |
| Publication Year: |
2023 |
| Collection: |
King Abdullah University of Science and Technology: KAUST Repository |
| Description: |
Organic electrochemical transistors (OECTs) are becoming increasingly ubiquitous in various applications at the interface with biological systems. However, their widespread use is hampered by the scarcity of electron-conducting (n-type) backbones and the poor performance and stability of the existing n-OECTs. Here, we introduce organic salts as a solution additive to improve the transduction capability, shelf life, and operational stability of n-OECTs. We demonstrate that the salt-cast devices present a 10-fold increase in transconductance and achieve at least one year-long stability, while the pristine devices degrade within four months of storage. The salt-added films show improved backbone planarity and greater charge delocalization, leading to higher electronic charge carrier mobility. These films show a distinctly porous morphology where the interconnectivity is affected by the salt type, responsible for OECT speed. The salt-based films display limited changes in morphology and show lower water uptake upon electrochemical doping, a possible reason for the improved device cycling stability. Our work provides a new and easy route to improve n-type OECT performance and stability, which can be adapted for other electrochemical devices with n-type films operating at the aqueous electrolyte interface. ; L.Q.F. acknowledges the support of a NIST-National Research Council fellowship. This research used beamline 11BM (CMS) of the National Synchrotron Light Source and U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under contract No. DE-SC0012704. S.I. This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) under Award Nos. OSR-2019-CRG8-4095, URF/1/4073-01, and ORA-2021-CRG10-4650. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf; image/jpeg |
| Language: |
unknown |
| ISSN: |
2694-2461 |
| Relation: |
Ohayon, D., Flagg, L. Q., Giugni, A., Wustoni, S., Li, R., Hidalgo Castillo, T. C., Emwas, A.-H., Sheelamanthula, R., McCulloch, I., Richter, L. J., & Inal, S. (2023). Salts as Additives: A Route to Improve Performance and Stability of n-Type Organic Electrochemical Transistors. ACS Materials Au. https://doi.org/10.1021/acsmaterialsau.2c00072; ACS Materials Au; http://hdl.handle.net/10754/690176 |
| DOI: |
10.1021/acsmaterialsau.2c00072 |
| Availability: |
http://hdl.handle.net/10754/690176; https://doi.org/10.1021/acsmaterialsau.2c00072 |
| Rights: |
Archived with thanks to ACS Materials Au under a Creative Commons license, details at: https://creativecommons.org/licenses/by/4.0/ ; https://creativecommons.org/licenses/by/4.0/ |
| Accession Number: |
edsbas.F4E40237 |
| Database: |
BASE |