Home > Articles > Published articles > Local and correlated studies of humidity-mediated ferroelectric thin film surface charge dynamics |
Date: | 2021 |
Abstract: | Electrochemical phenomena in ferroelectrics are of particular interest for catalysis and sensing applications, with recent studies highlighting the combined role of the ferroelectric polarisation, applied surface voltage and overall switching history. Here, we present a systematic Kelvin probe microscopy study of the effect of relative humidity and polarisation switching history on the surface charge dissipation in ferroelectric Pb(ZrTi)O thin films. We analyse the interaction of surface charges with ferroelectric domains through the framework of physically constrained unsupervised machine learning matrix factorisation, Dictionary Learning, and reveal a complex interplay of voltage-mediated physical processes underlying the observed signal decays. Additional insight into the observed behaviours is given by a Fitzhugh-Nagumo reaction-diffusion model, highlighting the lateral spread and charge passivation process contributors within the Dictionary Learning analysis. |
Grants: | Agencia Estatal de Investigación CEX2019-000917-S Agencia Estatal de Investigación PID2019-110907GB-I00 Agencia Estatal de Investigación PID2019-109931GB-I00 |
Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Language: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Subject: | Applied surface ; Charge dynamics ; Dictionary learning ; Electrochemical phenomenon ; Ferroelectric polarization ; Ferroelectric thin-films ; Kelvin probe microscopy ; Sensing applications ; Surface voltages ; Thin film surfaces |
Published in: | npj Computational Materials, Vol. 7 (2021) , art. 163, ISSN 2057-3960 |
7 p, 4.6 MB |