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10 October 2024 An easy to implement strategy for improving organic electrochemical transistor stability: combining chemical doping with solvent degassing
Vianna Le, Kyle N. Baustert, Megan Brown, Joel H. Bombile, Lucas Q. Flagg, Karl F. Thorley, Christina J. Kousseff, Olga Solomeshch, Iain McCulloch, Nir Tessler, Chad Risko, Kenneth R. Graham, Alexandra F. Paterson
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Proceedings Volume 13125, Organic and Hybrid Transistors XXIII; 1312502 (2024) https://doi.org/10.1117/12.3028019
Event: Organic Photonics + Electronics, 2024, San Diego, California, United States
Abstract
Although p-type organic mixed ionic electronic conductors (OMIECs) are susceptible to oxidation, it has not yet been considered as to whether oxygen could behave as an uncontrolled p-dopant. Here, oxygen dissolved in solvents is shown to be behave as a p-dopant, that fills traps to enable more effective electrochemical doping in OMIECs and organic electrochemical transistors (OECTs). Yet the presence of oxygen is also known to jeopardize OECT stability. A two-step strategy is introduced to solve this contradictory problem, where first the solvent is degassed, and second the OMIEC is doped in a controlled manner using a chemical dopant. This strategy increases on-off ratio, tunes the threshold voltage, and enhances the transconductance, mobility and the µC* product, while having a remarkable impact on both p-type and n-type OECT stability. This simple solution-processing technique is easily implemented, low-cost, and highly effective in an oxygen-rich environment. The data herein suggests that combining chemical doping with solvent degassing could be a broadly applicable technique to improve essential criteria needed to realize organic bioelectronics and more complex OMIEC circuitry
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Vianna Le, Kyle N. Baustert, Megan Brown, Joel H. Bombile, Lucas Q. Flagg, Karl F. Thorley, Christina J. Kousseff, Olga Solomeshch, Iain McCulloch, Nir Tessler, Chad Risko, Kenneth R. Graham, and Alexandra F. Paterson "An easy to implement strategy for improving organic electrochemical transistor stability: combining chemical doping with solvent degassing", Proc. SPIE 13125, Organic and Hybrid Transistors XXIII, 1312502 (10 October 2024); https://doi.org/10.1117/12.3028019
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KEYWORDS
Biosensing
Doping
Electrical properties
Environmental sensing
Logic
Power consumption
Sensors
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