Frequency Dependent Dynamical Electromechanical Response of Mixed Ionic-Electronic Conductors

TL;DR

This paper analyzes the frequency-dependent electromechanical response of mixed ionic-electronic conductors, revealing complex nonlinear behaviors and proposing its use as a nanoscale diagnostic tool for electronic properties.

Contribution

It introduces a comprehensive analysis of dynamic electromechanical responses considering various ionic and electronic boundary conditions and effects.

Findings

Identification of nonlinear response behaviors such as hysteresis and butterfly curves

Prediction of electromechanical response as a diagnostic for electronic states

Analysis of effects like ion concentration, charge states, and flexoelectricity

Abstract

Frequency dependent dynamic electromechanical response of the mixed ionic-electronic conductor film to a periodic electric bias is analyzed for different electronic and ionic boundary conditions. Dynamic effects of mobile ions concentration (stoichiometry contribution), charge state of acceptors (donors), electron concentration (electron-phonon coupling via the deformation potential) and flexoelectric effect contribution are discussed. A variety of possible nonlinear dynamic electromechanical response of MIEC films including quasi-elliptic curves, asymmetric hysteresis-like loops with pronounced memory window and butterfly-like curves are calculated. The electromechanical response of ionic semiconductor is predicted to be a powerful descriptor of local valence states, band structure and electron-phonon correlations that can be readily measured in the nanoscale volumes and in the presence of strong electronic conductivity.