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Oriented bismuth oxyhalide thin films are of strategic importance not only for their intrinsic properties but also as a gateway to many other valuable materials via their ability to undergo facile topotactic reactions. To progress the numerous applications linked to this family of materials this work identifies, for the first time, the mechanism regulating crystal orientation in bismuth oxyhalide (BiOI) thin films. Detailed experiments, backed by density functional theory (DFT) calculations, reveal the pivotal role of iodine (halide) anions to modify the van der Waals stacking energies required to direct orientation. Using our methodology, we demonstrate (001) BiOI thin films on commercially relevant wafer scales with unprecedented (001) crystallographic alignment\u2014addressing the key challenge of scalability. To probe structure\u2010function relations, we fabricate BiOI photodetectors. Compared to unoriented devices, our (001)\u2010oriented films demonstrate vastly increased operational stability, fewer trap states, ON\/OFF signal switching up to 10\n                    <jats:sup>5<\/jats:sup>\n                    , low (pA) noise levels, and millisecond response times. Our work can be used as a general methodology to control orientations in BiOX and related chalcohalide systems.\n                  <\/jats:p>","DOI":"10.1002\/adma.74729","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T08:27:38Z","timestamp":1790152058000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Directing Near\u2010Perfect (001) Orientation in Wafer\u2010Scale BiOI Thin Films via Halide\u2010Mediated van der Waals Stacking"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3220-7079","authenticated-orcid":false,"given":"Gabriel","family":"Aygur","sequence":"first","affiliation":[{"name":"School of Science RMIT University  Melbourne Victoria 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