{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,19]],"date-time":"2026-10-19T13:53:08Z","timestamp":1792417988485,"version":"4.4.0"},"reference-count":58,"publisher":"Wiley","issue":"58","license":[{"start":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T00:00:00Z","timestamp":1786320000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T00:00:00Z","timestamp":1786320000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["advanced.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Advanced Science"],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Introducing a 2D perovskite layer on the surface of 3D perovskite has been broadly recognized as an effective strategy to enhance the performance of perovskite solar cells (PSCs). However, the mechanism governing the 2D phase formation remains uncertain. In this work, the phase transitions of 2D perovskite during spin\u2010coating and annealing processes has been investigated. Our findings reveal a dimensional phase shift from low to high n\u2010value 2D phases, driven by the release of organic cations during annealing. Additionally, the spin\u2010coating process exhibited concentration\u2010dependent behavior, where higher n\u2010octylamine hydrobromide (OABr) concentrations predominantly formed n = 1 phases. These observations highlight the complexity of the 2D phase composition at the 2D\/3D interface. The coexistence of various 2D phases significantly influences device performance, as a conflict between n = 1 and n \u2265 2 phases was identified. Through forming a well\u2010balanced proportion of different 2D phases, we achieved a wide\u2010bandgap perovskite solar cell with a significantly improved power conversion efficiency of 19.29%. This work suggests the critical roles of phase dynamics and n\u2010value distribution in optimizing 2D\/3D interfaces for advancing high\u2010performance wide\u2010bandgap PSCs.<\/jats:p>","DOI":"10.1002\/advs.76791","type":"journal-article","created":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T10:01:31Z","timestamp":1786356091000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Precise Management of n\u2010Value Distribution at the 2D\/3D Interface Enabling Efficient Wide\u2010Bandgap Perovskite Solar Cells"],"prefix":"10.1002","volume":"13","author":[{"given":"Yajie","family":"Yang","sequence":"first","affiliation":[{"name":"Institute of New Energy and Low\u2010Carbon Technology &amp; College of Materials Science and Engineering Sichuan University  Chengdu China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiaxin","family":"Ha","sequence":"additional","affiliation":[{"name":"Institute 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