Organic electrochemical transistors formed by in operando electropolymerization of the semiconducting channel, which we refer to as evolvable OECTs, or EOECTs, are increasingly becoming recognized as a simple and effective implementation of synapses in neuromorphic hardware. We have been developing EOECTs using a new class of water-soluble, single-component, mixed ion-electron conductors based on the 2,5-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)thiophene (ETE) backbone, which has been functionalized on the central thiophene with a hydrophilic sidechain. The aim of this talk is to highlight: the recent advances in understanding the behavior of these molecules, design principles that are useful to consider when developing EOECTs, and interesting algorithms that can be implemented with simple EOECT-based circuits.
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