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However, state\u2010of\u2010the\u2010art tandem solar cells typically employ mixed\u2010halide WBG perovskite, yet halide phase segregation remains a critical bottleneck. Here, we design a molecular confinement domain in which paired iodide\u2010bearing organic ligands bind adjacent FA\n                    <jats:sup>+<\/jats:sup>\n                    cations and are interconnected by a bifunctional diammonium linker, effectively suppressing halide segregation by constraining the dynamic motion of orientable FA\n                    <jats:sup>+<\/jats:sup>\n                    cations at the surface and interfaces of wide\u2010bandgap perovskites. The suppression of this motion effectively strengthens lead\u2010halide (Pb\u2010X) bond strength, reinforces the lattice rigidity, reduces lattice vibrational amplitude and increases halide ion migration energy barrier. As a result, I\u2010Br mixed\u2010halide segregation and defect evolution under prolonged illumination are effectively suppressed. Finally, the resulting mixed\u2010halide WBG films exhibit low trap densities, improved carrier transport, and enhanced light\/thermal stability. Such concept is applicable to both 1.68 and 1.78\u00a0eV perovskite, yielding efficiencies of 24.21% and 21.20% in single\u2010junction cells, respectively. When integrated into silicon\u2010based tandem cells, the device delivers an efficiency of 33.59%, alongside durable long\u2010term stability with a T\n                    <jats:sub>96<\/jats:sub>\n                    lifetime of 1000 h under continuous operation.\n                  <\/jats:p>","DOI":"10.1002\/adma.73713","type":"journal-article","created":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T08:26:26Z","timestamp":1781252786000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Molecularly Confined Domains Enable Halide\u2010Stable Wide\u2010Bandgap Perovskites"],"prefix":"10.1002","volume":"38","author":[{"given":"Youming","family":"Zhu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Silicon and Advanced Semiconductor Materials and School of Materials Science and Engineering Hangzhou Global Scientific and Technological Innovation Center Zhejiang University  Hangzhou Zhejiang P. R. China"},{"name":"College of Chemistry and Materials Science Jinan University  Guangzhou Guangdong Province P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Biao","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Silicon and Advanced Semiconductor Materials and School of Materials Science and Engineering Hangzhou Global Scientific and Technological Innovation Center Zhejiang University  Hangzhou Zhejiang P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baochao","family":"Zheng","sequence":"additional","affiliation":[{"name":"College of Chemistry and Materials Science Jinan University  Guangzhou Guangdong Province P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-3692-2563","authenticated-orcid":false,"given":"Xingtao","family":"Wang","sequence":"additional","affiliation":[{"name":"Huaneng Clean Energy Research Institute  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiyao","family":"Wei","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Silicon and Advanced Semiconductor Materials and School of Materials Science and Engineering Hangzhou Global Scientific and Technological Innovation Center Zhejiang University  Hangzhou Zhejiang P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0354-8501","authenticated-orcid":false,"given":"Xuegong","family":"Yu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Silicon and Advanced Semiconductor Materials and School of Materials Science and Engineering Hangzhou Global Scientific and Technological Innovation Center Zhejiang University  Hangzhou Zhejiang P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deren","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Silicon and Advanced Semiconductor Materials and School of Materials Science and Engineering Hangzhou Global Scientific and Technological Innovation Center Zhejiang University  Hangzhou Zhejiang P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0545-5851","authenticated-orcid":false,"given":"Yong","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Silicon and Advanced Semiconductor Materials and School of Materials Science and Engineering Hangzhou Global Scientific and Technological Innovation Center Zhejiang University  Hangzhou Zhejiang P. R. China"},{"name":"Zhejiang Provincial Key Laboratory of Optoelectronic Functional Materials and Devices  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,6,12]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.aad5845"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nenergy.2017.9"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.adh3849"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010025\u201001732\u2010y"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2024.09.014"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2024.06.018"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202311745"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41578\u2010020\u20100221\u20101"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.2c10149"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598\u2010021\u201099621\u20101"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010025\u201064545\u20101"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chempr.2021.08.009"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010024\u201008158\u20106"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010025\u201001618\u2010z"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41565\u2010025\u201001899\u2010z"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010024\u201046044\u2010x"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1039\/D5EE00264H"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202407681"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/aenm.202401809"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202500501"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010023\u201036224\u20106"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010023\u201001180\u20106"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202413304"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1039\/C6CP01723A"},{"key":"e_1_2_9_26_1","doi-asserted-by":"publisher","DOI":"10.1021\/jz5026323"},{"key":"e_1_2_9_27_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2EE02330J"},{"key":"e_1_2_9_28_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41563\u2010022\u201001390\u20103"},{"key":"e_1_2_9_29_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202425620"},{"key":"e_1_2_9_30_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202502450"}],"container-title":["Advanced Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/adma.73713","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/adma.73713","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/adma.73713","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T13:24:55Z","timestamp":1784294695000},"score":1,"resource":{"primary":{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/10.1002\/adma.73713"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,6,12]]},"references-count":29,"journal-issue":{"issue":"40","published-print":{"date-parts":[[2026,7]]}},"alternative-id":["10.1002\/adma.73713"],"URL":"https:\/\/doi.org\/10.1002\/adma.73713","archive":["Portico"],"relation":{},"ISSN":["0935-9648","1521-4095"],"issn-type":[{"value":"0935-9648","type":"print"},{"value":"1521-4095","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,6,12]]},"assertion":[{"value":"2026-03-10","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-06-01","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-06-12","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e73713"}}