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Biexcitons are conventionally understood to radiatively decay more rapidly than excitons. This view stems largely from studies in strongly confined quantum dots (QDs), where inter\u2010exciton correlations are often neglected. In contrast, weakly confined systems such as large CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    QDs exhibit significant Coulomb correlations, necessitating a revised framework for biexciton radiative dynamics, one that has remained incomplete due to limited experimental insights. Here, we combine single\u2010particle photoluminescence (PL) spectroscopy with effective\u2010mass variational quantum Monte Carlo (VQMC) simulations to directly probe the biexciton geometry, exciton\u2013phonon interactions, and radiative decay in CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    QDs across a range of sizes and temperatures. We reveal that the biexciton\u2010to\u2010exciton radiative decay lifetime ratio is strongly modulated by inter\u2010exciton correlations, with a striking inversion of the expected decay lifetime hierarchy in the weak\u2010confinement regime. Specifically, at cryogenic temperatures, biexcitons exhibit anomalously longer radiative lifetime (148\u00a0\u00b1\u00a030\u00a0ps) than excitons (106\u00a0\u00b1\u00a016\u00a0ps), challenging conventional models. These findings uncover a correlation\u2010driven regime of multiexciton physics and suggest new routes for tailoring light\u2013matter interactions for classical and quantum photonic applications.\n                  <\/jats:p>","DOI":"10.1002\/adma.74849","type":"journal-article","created":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T14:16:20Z","timestamp":1788185780000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Unconventional Biexciton Dynamics in Superradiant Perovskite Quantum Dots Driven by Many\u2010Body Correlations"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8638-6925","authenticated-orcid":false,"given":"Chenglian","family":"Zhu","sequence":"first","affiliation":[{"name":"Institute of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  Z\u00fcrich Switzerland"},{"name":"Laboratory for Thin Films and Photovoltaics Empa \u2013 Swiss Federal Laboratories for Materials Science and Technology  D\u00fcbendorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6379-7796","authenticated-orcid":false,"given":"Jose L.","family":"Movilla","sequence":"additional","affiliation":[{"name":"Departament d'Educacio i Didactiques Especifiques Universitat Jaume I  Castello Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Petra","family":"Hoffmann","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  Z\u00fcrich Switzerland"},{"name":"Laboratory for Thin Films and Photovoltaics Empa \u2013 Swiss Federal Laboratories for Materials Science and Technology  D\u00fcbendorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ihor","family":"Cherniukh","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  Z\u00fcrich Switzerland"},{"name":"Laboratory for Thin Films and Photovoltaics Empa \u2013 Swiss Federal Laboratories for Materials Science and Technology  D\u00fcbendorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1069-710X","authenticated-orcid":false,"given":"Willem P. A.","family":"Verheijen","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  Z\u00fcrich Switzerland"},{"name":"Laboratory for Thin Films and Photovoltaics Empa \u2013 Swiss Federal Laboratories for Materials Science and Technology  D\u00fcbendorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9755-5085","authenticated-orcid":false,"given":"Leon G.","family":"Feld","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  Z\u00fcrich Switzerland"},{"name":"Laboratory for Thin Films and Photovoltaics Empa \u2013 Swiss Federal Laboratories for Materials Science and Technology  D\u00fcbendorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2813-7899","authenticated-orcid":false,"given":"Josep","family":"Planelles","sequence":"additional","affiliation":[{"name":"Departament de Qu\u00edmica F\u00edsica i Anal\u00edtica Universitat Jaume I  Castell\u00f3 Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6597-3266","authenticated-orcid":false,"given":"Maryna I.","family":"Bodnarchuk","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Z\u00fcrich  Z\u00fcrich Switzerland"},{"name":"Laboratory for Thin Films and Photovoltaics Empa \u2013 Swiss Federal Laboratories for Materials Science and Technology  D\u00fcbendorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8399-5773","authenticated-orcid":false,"given":"Simon 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