Towards a Quantitative Description of Solid Electrolyte Conductance Switches

TL;DR

This paper provides a quantitative analysis of electronic transport in a resistive switching device with a solid electrolyte, modeling the process up to resistance switching to better understand the underlying mechanisms.

Contribution

It introduces a Hebb-Wagner based model for steady-state electron transport in a solid electrolyte device, covering the entire non-stoichiometry range and pre-switching conditions.

Findings

Model accurately describes electron transport up to resistance switching.

Nonlinear I-V curves explained by polarization of mixed conductor.

Provides a step towards quantitative understanding of switching mechanisms.

Abstract

We present a quantitative analysis of the steady state electronic transport in a resistive switching device. The device is composed of a thin film of Ag$_{2}$S (solid electrolyte) contacted by a Pt nano-contact acting as ion-blocking electrode, and a large area Ag reference electrode. When applying a bias voltage both ionic and electronic transport occurs, and depending on the polarity it causes an accumulation of ions around the nano-contact. At small applied voltages (pre-switching) we observed this as a strongly nonlinear current-voltage curve, which have been modeled using the Hebb-Wagner treatment for polarization of a mixed conductor. This model correctly describes the transport of the electrons within the polarized solid electrolyte in the steady state up until the resistance switching, covering the entire range of non-stoichiometries, and including the supersaturation range just before the deposition of elemental silver. In this way, it is a step towards a quantitative understanding of the processes that lead to resistance switching.