Crystallinity Control of Polythiophene Regio-Block Copolymers to Understand the Relation between Crystallinity-dependent Doping Kinetics and Signaling Properties of Organic Electrochemical Synaptic Transistors
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Organic mixed-ionic electronic conductor (OMIEC) based artificial synaptic transistor (STr) emerged as attractive applications for neuromorphic computing systems. The performance of STr is subordinated to conductance modulation properties, while microstructure of OMIEC is key parameter determining electrochemical doping kinetics. However, there is a lack of understanding on the relation between doping kinetics and signaling properties of STr. Here, we demonstrate STr with block copolymer composed with two regio-isomers. By introducing regio-random block, only the amorphous fraction of STr channel could be regulated without altering the ordered domain geometry. Amorphous fraction dependent STr responses, such as state number, retention and non-linearity, were investigated through electrochemical and optoelectronic analysis. We believe that our fundamental studies provide a guideline on microstructure engineering of OMIEC for advanced artificial synapse and neuromorphic applications.