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Here, we introduce a fullerene\u2010based photoresponsive molecule, C\n                    <jats:sub>60<\/jats:sub>\n                    \u2010azo, to construct an adaptive SnO\n                    <jats:sub>2<\/jats:sub>\n                    \/perovskite interface. Unlike static interlayers, C\n                    <jats:sub>60<\/jats:sub>\n                    \u2010azo functions as a dynamic molecular switch. Under UV illumination, its trans\u2010to\u2010cis isomerization actively generates a beneficial compressive stress to counteract residual tensile strain. Simultaneously, the light\u2010enriched cis\u2010isomer enhances dynamic defect passivation. This mechanochemical dual mechanism effectively mitigates UV\u2010driven lattice distortion and chemical degradation. Consequently, the modified n\u2013i\u2013p PSCs achieve a power conversion efficiency of 26.60% and exhibit enhanced durability. Unencapsulated devices retain 92.7% of their initial performance after 488 h of continuous UV exposure. Encapsulated cells also maintain 94.7% efficiency after 1000 h of maximum power point tracking under continuous 1\u2010sun\u2010equivalent LED illumination. This work establishes dynamic photoresponsive interface engineering as a pioneering strategy for durable perovskite optoelectronics.\n                  <\/jats:p>","DOI":"10.1002\/adma.74220","type":"journal-article","created":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T10:22:02Z","timestamp":1784802122000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dynamic Strain Regulation Via Photoresponsive Fullerenes Enables High\u2010Performance and UV\u2010Robust Perovskite Solar Cells"],"prefix":"10.1002","volume":"38","author":[{"given":"Jianfei","family":"Yang","sequence":"first","affiliation":[{"name":"State Key Laboratory of New Ceramics Materials School of Materials Science and Engineering Tsinghua University  Beijing 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Science and Engineering Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yizhou","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of New Ceramics Materials School of Materials Science and Engineering Tsinghua University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-4169-1711","authenticated-orcid":false,"given":"Sheng","family":"Li","sequence":"additional","affiliation":[{"name":"School of Physics and Technology School of Microelectronics Key Lab of Artificial Micro\u2010 and Nano\u2010Structures of Ministry of Education Wuhan University  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3081-0472","authenticated-orcid":false,"given":"Zhiping","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Physics and Technology School of Microelectronics Key Lab of Artificial Micro\u2010 and Nano\u2010Structures of Ministry of Education Wuhan University  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3382-5960","authenticated-orcid":false,"given":"Hong","family":"Lin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of New Ceramics Materials School of Materials Science and Engineering Tsinghua University  Beijing 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