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Here, we report silver selenide\/silver secondary phases (Ag\n                    <jats:sub>2<\/jats:sub>\n                    Se\/Ag\u2010SPs) nanocomposite films comprising vertically aligned Ag\u2010SPs within a (00\n                    <jats:italic>l<\/jats:italic>\n                    )\u2010oriented Ag\n                    <jats:sub>2<\/jats:sub>\n                    Se matrix, fabricated via oriented growth and confined phase separation. This customized architecture suppresses lattice thermal transport through interfacial phonon scattering and regulates carrier transport via shallow\u2010barrier Ag\/Ag\n                    <jats:sub>2<\/jats:sub>\n                    Se interfaces, collectively optimizing the thermo\u2010electric conversion process. Moreover, plasmonic waveguiding within Ag\u2010SPs domains improves broadband light absorption, thereby promoting photothermal heat generation, enabling a high PTE responsivity of 126\u00a0V W\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 1550\u00a0nm. When integrated with machine\u2010learning\u2010based transient signal classification, this detector achieves 100% sensitivity in flame recognition, allowing sub\u2010second differentiation of combustion events from innocuous thermal sources. This photon\u2013phonon\u2013electron synergistic enhancement mechanism establishes a scalable paradigm for efficient PTE conversion, offering transformative potential for intelligent fire\u2010warning systems.\n                  <\/jats:p>","DOI":"10.1002\/adma.75105","type":"journal-article","created":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T07:59:33Z","timestamp":1790409573000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Photon\u2013Phonon\u2013Electron Synergy Enables Efficient Photothermoelectric Conversion for Intelligent Fire Warning"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7617-9201","authenticated-orcid":false,"given":"Shuai","family":"Zhang","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering City University of Hong Kong  Hong Kong SAR P. R. 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