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However, the mesoporous TiO\n                    <jats:sub>2<\/jats:sub>\n                    (m\u2010TiO\n                    <jats:sub>2<\/jats:sub>\n                    ) electron transport layer within this architecture readily chemisorbs oxygen molecules, generating reactive species that aggressively oxidize Sn\n                    <jats:sup>2+<\/jats:sup>\n                    to Sn\n                    <jats:sup>4+<\/jats:sup>\n                    and degrade device performance. Herein, we propose a UV\u2010assisted O\n                    <jats:sub>2<\/jats:sub>\n                    desorption strategy to deactivate the m\u2010TiO\n                    <jats:sub>2<\/jats:sub>\n                    surface. Under a nitrogen atmosphere, UV irradiation effectively triggers the desorption of adsorbed oxygen species, resetting the interface to a chemically inert state. Comprehensive electron paramagnetic resonance and X\u2010ray photoelectron spectroscopy analyses systematically validate this \u201csurface cleansing\u201d effect. The treatment suppresses Sn\n                    <jats:sup>2+<\/jats:sup>\n                    oxidation by surface\u2010adsorbed oxygen, preserves the Sn\u2010Pb lattice integrity, suppresses non\u2010radiative recombination, and optimizes carrier dynamics at the modulated TiO\n                    <jats:sub>2<\/jats:sub>\n                    \/perovskite interface. Consequently, the devices achieve a champion power conversion efficiency of 10.55%, the first demonstration of Sn\u2010Pb p\u2010MPSCs, obviously outperforming control devices (9.38%). Moreover, inhibiting interfacial oxidation yields prolonged storage longevity, with unencapsulated cells retaining 93% of their initial efficiency after 1250\u00a0h in the N\n                    <jats:sub>2<\/jats:sub>\n                    atmosphere.\n                  <\/jats:p>","DOI":"10.1002\/smll.75466","type":"journal-article","created":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T11:05:40Z","timestamp":1787828740000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["UV\u2010Assisted Interfacial Oxygen Desorption for High\u2010Performance Hole\u2010Conductor\u2010Free, Printable Mesoscopic Sn\u2010Pb Perovskite Solar Cells"],"prefix":"10.1002","author":[{"given":"Qian","family":"Yue","sequence":"first","affiliation":[{"name":"Michael Gr\u00e4tzel Center For Mesoscopic Solar Cells Wuhan National Laboratory For Optoelectronics Huazhong University of Science and Technology  Wuhan Hubei 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