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However, insufficient light utilization, particularly at longer wavelength ranges, and inefficient interfacial hole extraction continue to limit the performance of tin (Sn)\u2010based perovskite solar cells (TPSCs). Herein, we introduce a plasmonic Ag nanostructured interlayer at the Sn\u2010based perovskite\/PEDOT:PSS interface to synergistically regulate optical absorption and carrier transport through localized surface plasmon resonance (LSPR) and near\u2010electric field enhancement. The plasmonic interlayer reduces interfacial carrier accumulation, accelerates hole extraction, and suppresses non\u2010radiative recombination, while simultaneously improving long\u2010wavelength light harvesting through enhanced optical field confinement. As a result, the efficiency of TPSCs increases from 13.03% to 16.48%, accompanied by a pronounced enhancement in incident photon\u2010to\u2010current conversion efficiency in the long\u2010wavelength region. In addition, the TPSCs incorporating Ag nanoparticles exhibit improved operational stability, retaining over 86% of their initial efficiency after 800 h. This work demonstrates an effective strategy for integrating plasmonic metallic nanostructures into TPSCs to overcome key optical and electronic limitations and advance high\u2010efficiency lead\u2010free photovoltaics.<\/jats:p>","DOI":"10.1002\/adma.74769","type":"journal-article","created":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T07:30:32Z","timestamp":1787643032000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Plasmon\u2010Driven Light Absorption and Hole Extraction in Efficient Tin\u2010Based Perovskite Solar Cells"],"prefix":"10.1002","volume":"38","author":[{"given":"Siyuan","family":"Lin","sequence":"first","affiliation":[{"name":"College of Chemistry and Chemical Engineering Shanghai University of Engineering Science  Shanghai People's Republic of 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