Memristor behaviour in PEDOT:PSS electrochemical transistors with silver contacts - NEWS

Memristor behaviour in PEDOT:PSS electrochemical transistors with silver contacts Ivan B Dimov, PhD University of Cambridge Conductive polymers, such as poly-3,4-ethylenedioxythiophene:polystyrene sulfonate (PEDOT:PSS) feature prominently in wearable and implantable bioelectronics. These materials can be used both in passive electrodes, and in active devices, such as organic electrochemical transistors (OECTs). While devices such as OECTs can offer improved amplification of recorded signals, electrochemical requirements necessitate the use of gold source and drain electrodes. Lowering the cost of such devices is crucial in increasing adoption in the internet of healthcare things (IoHT). One possible step would be to replace gold tracks and interconnects with silver. However, devices consisting of Ag/PEDOT:PSS/Ag stacks, when biased, exhibit hysteretic behaviour consistent with a memristor. We speculate this is due to differences in electrochemical behaviour of silver metal in aqueous electrolyte solutions.