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Here, we establish quantum\u2010sized nanoclusters (NCs) as a new class of NIR\u2010driven photo\u2010thermo\u2010electric transducers via light\u2010to\u2010heat\u2010to\u2010electricity cascade conversion. Two alkynyl\u2010protected alloy NCs, namely, Au\n                    <jats:sub>24<\/jats:sub>\n                    Ag\n                    <jats:sub>20<\/jats:sub>\n                    (M\n                    <jats:sub>44<\/jats:sub>\n                    ) and Au\n                    <jats:sub>43<\/jats:sub>\n                    Ag\n                    <jats:sub>38<\/jats:sub>\n                    (M\n                    <jats:sub>81<\/jats:sub>\n                    ), exhibit NIR\u2010II photoluminescence, being rare among the NCs. More strikingly, the NC solutions deliver record photothermal conversion efficiencies of 69% and 91% with M\n                    <jats:sub>44<\/jats:sub>\n                    and M\n                    <jats:sub>81<\/jats:sub>\n                    , respectively, which are the highest reported for atomically precise nanomaterials to date, together with their exceptional solid\u2010state temperature rise of more than 200\u00b0C under 808\u00a0nm irradiation for thermoelectric generation (TEG) while maintaining photostability. The nanocluster absorption profiles overlap well with the solar spectrum, suggesting the potential of such NCs in converting sunlight to thermoelectricity. The current work will drive the future design of next\u2010generation NC\u2010based devices that are capable of harvesting the NIR solar spectrum for light\u2010to\u2010heat\u2010to\u2010electricity conversion and other photonic energy harvesting technologies.\n                  <\/jats:p>","DOI":"10.1002\/advs.78061","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T16:30:38Z","timestamp":1790785838000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Near\u2010Unity Photothermal Conversion in Bimetallic M\n                    <sub>44<\/sub>\n                    and M\n                    <sub>81<\/sub>\n                    Nanoclusters Enables NIR\u2010Driven Photo\u2010Thermo\u2010Electricity Generation"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2171-7524","authenticated-orcid":false,"given":"Avirup","family":"Sardar","sequence":"first","affiliation":[{"name":"Department of Chemistry Carnegie Mellon University  Pittsburgh USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9499-9748","authenticated-orcid":false,"given":"Abhrojyoti","family":"Mazumder","sequence":"additional","affiliation":[{"name":"Department of Chemistry Carnegie Mellon University  Pittsburgh USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5202-0909","authenticated-orcid":false,"given":"Weijie","family":"Ji","sequence":"additional","affiliation":[{"name":"Department of Chemistry Carnegie Mellon University  Pittsburgh 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