Designing with Iontronic Logic Gates -- From a Single Polyelectrolyte Diode to Small Scale Integration

TL;DR

This paper demonstrates the design and integration of iontronic logic gates using bi-polar polyelectrolyte diodes, enabling on-chip ionic circuits that mimic electronic logic with potential for miniaturization and new computing paradigms.

Contribution

It introduces a novel approach to creating iontronic logic gates with small-scale integration, expanding the possibilities for ionic circuit design and performance optimization.

Findings

Successful implementation of ionic logic gates using polyelectrolyte diodes

Analysis of limitations in gate integration and signal degradation

Design rules proposed to enhance iontronic circuit performance

Abstract

This article presents the implementation of on-chip iontronic circuits via small-scale integration of multiple ionic logic gates made of bi-polar polyelectrolyte diodes. These ionic circuits are analogous to solid-state electronic circuits, with ions as the charge carriers instead of electrons/holes. We experimentally characterize the responses of a single fluidic diode made of a junction of oppositely charged polyelectrolytes (i.e., anion and cation exchange membranes), with a similar underlying mechanism as a solid-state p- and n-type junction. This served to carry out pre-designed logical computations in various architectures by integrating multiple diode-based logic gates, where the electrical signal between the integrated gates was transmitted entirely through ions. The findings shed light on the limitations affecting the number of logic gates that can be integrated, the degradation of the electrical signal, their transient response, and the design rules that can improve the performance of iontronic circuits.