Ergodic and Nonergodic Dynamics of Oxygen Vacancy Migration at the Nanoscale in Inorganic Perovskites
- 14 October 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 20 (10), 7530-7535
- https://doi.org/10.1021/acs.nanolett.0c03002
Abstract
Perovskites are widely utilized either as a primary component or as a substrate in which the dynamics of charged oxygen vacancy defects play an important role. Current knowledge regarding the dynamics of vacancy mobility in perovskites is solely based upon volume- and/or time-averaged measurements. This impedes our understanding of the basic physical principles governing defect migration in inorganic materials. Here, we measure the ergodic and nonergodic dynamics of vacancy migration at the relevant spatial and temporal scales using time-resolved atomic force microscopy techniques. Our findings demonstrate that the time constant associated with oxygen vacancy migration is a local property and can change drastically on short length and time scales, such that nonergodic states lead to a dramatic increase in the migration barrier. This correlated spatial and temporal variation in oxygen vacancy dynamics can extend hundreds of nanometers across the surface in inorganic perovskites.Funding Information
- Government of Canada
- McGill University
- Fonds de Recherche du Qu?bec - Nature et Technologies
- Natural Sciences and Engineering Research Council of Canada
- ?cole de technologie sup?rieure
This publication has 23 references indexed in Scilit:
- From bulk to molecularly thin hybrid perovskitesNature Reviews Materials, 2020
- Influence of surface atomic structure demonstrated on oxygen incorporation mechanism at a model perovskite oxideNature Communications, 2018
- Controlled manipulation of oxygen vacancies using nanoscale flexoelectricityNature Communications, 2017
- Probing nanoscale oxygen ion motion in memristive systemsNature Communications, 2017
- Improved chemical and electrochemical stability of perovskite oxides with less reducible cations at the surfaceNature Materials, 2016
- Oxygen Diffusion in SrTiO3 and Related Perovskite OxidesAdvanced Functional Materials, 2015
- Probing Surface and Bulk Electrochemical Processes on the LaAlO3–SrTiO3 InterfaceACS Nano, 2012
- Measuring oxygen reduction/evolution reactions on the nanoscaleNature Chemistry, 2011
- Oxygen Vacancy Clustering and Electron Localization in Oxygen-Deficient:StudyPhysical Review Letters, 2007
- Switching the electrical resistance of individual dislocations in single-crystalline SrTiO3Nature Materials, 2006