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Consequently, the thermoelectric performance, especially for n\u2010type materials, remains considerably lower than that of their inorganic counterparts. Herein, a high\u2010performance n\u2010type thermoelectric polymer, P(TDPP\u2010BT\u2010LEG) is reported, with an unexpectedly high Seebeck coefficient and ultrahigh power factor, driven by its intrinsically large energy gap between the Fermi and transport energy levels and high charge carrier mobility. Notably, it is shown that strong electrostatic interactions induced by the ethylene glycol side chains facilitate charge transfer between the dopants and the polymer. This enables effective doping of polymers with high LUMO levels. Furthermore, efficient charge transport, arising from favorable molecular packing, allows the polymer to maintain high electrical conductivity even at low charge carrier concentrations. Ultimately, this polymer achieves a record\u2010high n\u2010type power factor of 397 \u00b5W\u00a0m\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0K\n                    <jats:sup>\u22122<\/jats:sup>\n                    , with a high Seebeck coefficient of \u2212420 \u00b5V\u00a0K\n                    <jats:sup>\u20121<\/jats:sup>\n                    . This study highlights the potential of enhancing the Seebeck coefficient through precise energy level tuning and molecular design, fundamentally advancing the rational design of high\u2010performance organic thermoelectric materials.\n                  <\/jats:p>","DOI":"10.1002\/adma.202512453","type":"journal-article","created":{"date-parts":[[2025,11,18]],"date-time":"2025-11-18T07:26:53Z","timestamp":1763450813000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Achieving Ultrahigh n\u2010Type Thermoelectric Power Factor in an Intrinsically Large Transport\u2010Fermi Energy Gap Conjugated Polymer"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5990-4261","authenticated-orcid":false,"given":"Jingyi","family":"Wang","sequence":"first","affiliation":[{"name":"National Key Laboratory of Advanced Micro and Nano Manufacture Technology Key Laboratory of Polymer Chemistry and Physics of Ministry of Education School of Materials Science and Engineering Peking University  Beijing 100871 P. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiran","family":"Pan","sequence":"additional","affiliation":[{"name":"National Key Laboratory of Advanced Micro and Nano Manufacture Technology Key Laboratory of Polymer Chemistry and Physics of Ministry of Education School of Materials Science and Engineering Peking University  Beijing 100871 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin\u2010Yu","family":"Deng","sequence":"additional","affiliation":[{"name":"National Key Laboratory of Advanced Micro and Nano Manufacture Technology Key Laboratory of Polymer Chemistry and Physics of Ministry of Education School of Materials Science and Engineering Peking University  Beijing 100871 P. R. 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