Surface charged species and electrochemistry of ferroelectric thin films

Domingo, Neus (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Barcelona, Spain) ; Gaponenko, Iaroslav (DQMP, University of Geneva, Geneva, Switzerland ; G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georigia, USA) ; Cordero-Edwards, Kumara (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Barcelona, Spain ; DQMP, University of Geneva, Geneva, Switzerland) ; Stucki, Nicolas (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Pérez-Dieste, Virginia (ALBA Synchrotron Light Source, Barcelona, Spain) ; Escudero, Carlos (ALBA Synchrotron Light Source, Barcelona, Spain) ; Pach, Elzbieta (Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Barcelona, Spain ; Institut de Ciència de Materials de Barcelona (ICMAB), CSIC, CAMPUS UAB, Barcelona, Spain) ; Verdaguer, Albert (Institut de Ciència de Materials de Barcelona (ICMAB), CSIC, Campus UAB, Barcelona, Spain) ; Paruch, Patrycja (DQMP, University of Geneva, Geneva, Switzerland)

The combination of scanning probe microscopy and ambient pressure X-ray photoelectron spectroscopy opens up new perspectives for the study of combined surface chemical, electrochemical and electromechanical properties at the nanoscale, providing both nanoscale resolution of physical information and the chemical sensitivity required to identify surface species and bulk ionic composition. In this work, we determine the nature and evolution over time of surface chemical species obtained after water-mediated redox reactions on Pb(Zr0.2,Ti0.8)O3 thin films with opposite as-grown polarization states. Starting with intrinsically different surface chemical composition on the oppositely polarized films (as a result of their ferroelectric-dominated interaction with environmental water), we identify the reversible and irreversible electrochemical reactions under an external electric field, distinguishing switching and charging events. We find that while reversible ionic displacements upon polarization switching dominate screening in the bulk of the sample, polarization dependent irreversible redox reactions determine surface chemical composition, which reveals itself as a characteristic fingerprint of the ferroelectric polarization switching history.


Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEPIA - Genève
Institute:
inSTI - Institut des Sciences et Technologies industrielles
Date:
2019-07
Pagination:
11 p.
Published in:
Nanoscale
Numeration (vol. no.):
2019, vol. 11, article no. 17920
DOI:
ISSN:
2040-3364
Appears in Collection:



 Record created 2020-03-10, last modified 2020-10-27

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