Publication date: 22nd July 2026
I will introduce an electric-field-sensitive solid polymer electrolyte for which the electric-double layer (EDL) dynamics (i.e., formation and dissipation) can be tuned by an applied voltage. The electrolyte is designed to both facilitate ion motion and undergo the Menshutkin reaction, triggered by the large electric fields generated by the EDL itself. For programming voltages larger than 2 V, the reaction crosslinks a copolymer, trapping ions at the interface between the electrolyte and the channel of a 2D-dimensional crystal transistor, giving rise to persistent channel doping that remains after grounding the gate terminal. The EDL dynamics can be tuned by tuning the magnitude of the programming voltage. Low-temperature, dual-gated measurements confirm that ion trapping leads to non-volatility by distinguishing mobile, bulk ions from those trapped at the interface. The programmed states show an average retention of the induced sheet-carrier density of 80% over seven weeks at ambient conditions. Such functionality could be applied to temporal matching for neuromorphic computing.
The research was supported by the National Science Foundation (NSF, U.S.) under NSF-DMR-EPMD #2132006. Work performed in the University of Pittsburgh Nanofabrication and Characterization Core Facility (RRID: SCR\_05124) and Dietrich School Materials Characterization Laboratory (RRID:SCR\_025127), and services and instruments used in this project were graciously supported, in part, by the University of Pittsburgh.
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