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Surface Chemistry Controls Anomalous Ferroelectric Behavior in Lithium Niobate
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 34, p. 29153-29160Article in journal (Refereed) Published
Abstract [en]

Polarization switching in ferroelectric materials underpins a multitude of applications ranging from nonvolatile memories to data storage to ferroelectric lithography. While traditionally considered to be a functionality of the material only, basic theoretical considerations suggest that switching is expected to be intrinsically linked to changes in the electrochemical state of the surface. Hence, the properties and dynamics of the screening charges can affect or control the switching dynamics. Despite being recognized for over 50 years, analysis of these phenomena remained largely speculative. Here, we explore polarization switching on the prototypical LiNbO3 surface using the combination of contact mode Kelvin probe force microscopy and chemical imaging by time-of-flight mass-spectrometry and demonstrate pronounced chemical differences between the domains. These studies provide a consistent explanation to the anomalous polarization and surface charge behavior observed in LiNbO3 and point to new opportunities in chemical control of polarization dynamics in thin films and crystals via control of surface chemistry, complementing traditional routes via bulk doping, and substrate-induced strain and tilt systems.

Place, publisher, year, edition, pages
2018. Vol. 10, no 34, p. 29153-29160
Keywords [en]
ferroelectrics, surface chemistry, lithium niobate, switching dynamics, scanning probe microscopy, time-of-flight secondary ion mass spectrometry
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-235748DOI: 10.1021/acsami.8b09513ISI: 000443654600098PubMedID: 30062871Scopus ID: 2-s2.0-85052309282OAI: oai:DiVA.org:kth-235748DiVA, id: diva2:1253064
Note

QC 20181003

Available from: 2018-10-03 Created: 2018-10-03 Last updated: 2020-03-09Bibliographically approved

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Publisher's full textPubMedScopushttps://pubs.acs.org/doi/abs/10.1021/acsami.8b09513

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Baghban, Mohammad AminGallo, Katia

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