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Here, we use large-scale molecular dynamics simulations with a reactive force field to investigate defects in CsPbBrxI3\u2013x perovskites, focusing on how defect mobility can be controlled and the stability of the material improved by layered ordering of Br and I anions. Our results show that layered halide ordering induces strongly anisotropic defect diffusion: migration proceeds readily along the layers, whereas diffusion across them is strongly suppressed. For Cs defects, this anisotropy originates from directional lattice strain and the associated octahedral tilting, whereas halide migration is governed by an interplay between strain and preferential local halide bonding configurations.<\/jats:p>","DOI":"10.1021\/acsami.6c09668","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T22:01:35Z","timestamp":1790546495000},"page":"54130-54138","source":"Crossref","is-referenced-by-count":0,"title":["Anisotropic Defect Diffusion in Layered CsPbBr\n                    <i>x<\/i>\n                    I3\u2013\n                    <i>x<\/i>\n                    Perovskites"],"prefix":"10.1021","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-2724-6771","authenticated-orcid":true,"given":"Konrad","family":"Wilke","sequence":"first","affiliation":[{"name":"Eindhoven University of Technology , , ,","place":["Eindhoven, The Netherlands, 5600 MB"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1068-9599","authenticated-orcid":true,"given":"Mike","family":"Pols","sequence":"additional","affiliation":[{"name":"Eindhoven University of Technology , , ,","place":["Eindhoven, The Netherlands, 5600 MB"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6600-6657","authenticated-orcid":true,"given":"Titus S.","family":"van Erp","sequence":"additional","affiliation":[{"name":"Norwegian University of Science and Technology , , ,","place":["Trondheim, Norway, 7941"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7639-4638","authenticated-orcid":true,"given":"Geert","family":"Brocks","sequence":"additional","affiliation":[{"name":"Eindhoven University of Technology , , ,","place":["Eindhoven, The Netherlands, 5600 MB"]},{"name":"Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente , , ,","place":["Enschede, The Netherlands, 7500 AE"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3658-8497","authenticated-orcid":true,"given":"Shuxia","family":"Tao","sequence":"additional","affiliation":[{"name":"Eindhoven University of Technology , , ,","place":["Eindhoven, The Netherlands, 5600 MB"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,27]]},"reference":[{"key":"2026100708062649600_cit1","doi-asserted-by":"publisher","first-page":"5757","DOI":"10.1038\/ncomms6757","article-title":"Steric Engineering of Metal-Halide Perovskites with Tunable Optical Band Gaps","volume":"5","author":"Filip","year":"2014","journal-title":"Nat. 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