Publication date: 28th June 2024
Electrochemical transistors (OECTs) have been shown to be promising devices for amplification of electrical signals and selective sensing of ions and biologically important molecules in an aqueous environment, and thus have potential to be utilised in bioelectronic applications. The sensitivity, selectivity and intensity of the response of this device is determined by the organic semiconducting polymer employed as the active layer. This presentation will discuss the role of glycol and alkyl chains on optimizing the trade-off between ion uptake through hydrated channels, facilitated by hydrophilic chains, and self-assembly driven ordering within the semiconducting domains, facilitated by hydrophobic chains. We show the design of new organic semiconducting materials which demonstrate good OECT performance, through operation in accumulation mode, with high transconductance and low operating voltage. Key aspects such as ion and charge transport in the bulk semiconductor and operational voltage and stability of the devices are addressed in order to elucidate important structure-property relationships. A range of new semiconducting polymers, designed to exhibit facile electrochemical doping of either holes or electrons, facilitate ion penetration and migration, as well as have aqueous compatibility are reported. Optimisation of a series of polymer parameters including electrochemical doping, charge carrier mobility and capacitance are discussed.
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