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Pronounced band nonparabolicity near the band edge is expected to promote the decoupling of a high Seebeck coefficient from high electrical conductivity; however, accessing this band\u2010edge transport regime at low temperatures remains challenging, as defect\u2010dominated scattering often masks the intrinsic band\u2010structure effects. Here, we experimentally show that single\u2010crystalline Bi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>3<\/jats:sub>\n                    can access a reduced\u2010scattering band\u2010edge transport regime in which the transport distribution becomes strongly energy dependent, enabling simultaneously a sizable thermopower and a high carrier mobility at cryogenic temperatures. This approach yields a record thermoelectric power factor of three times as high as that of conventional parabolic band\u2010dominated Bi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>3<\/jats:sub>\n                    . Quantum oscillation measurements reveal multiband transport components consistent with the band\u2010structure complexity of Bi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>3<\/jats:sub>\n                    , and magneto\u2010thermal conductivity measurements indicate a reduced Lorenz factor and suppressed electronic thermal conductivity in the same regime. The resultant over 600% thermoelectric enhancement in conventional Bi\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>3<\/jats:sub>\n                    demonstrates a practical strategy of advancement by engineering band\u2010edge transport in strong spin\u2013orbit coupled materials.\n                  <\/jats:p>","DOI":"10.1002\/adma.74476","type":"journal-article","created":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T05:26:47Z","timestamp":1786598807000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Cryogenic Thermoelectric Enhancement by Nonparabolic Band\u2010Edge Transport in Bi\n                    <sub>2<\/sub>\n                    Te\n                    <sub>3<\/sub>"],"prefix":"10.1002","volume":"38","author":[{"given":"Xuemei","family":"Wang","sequence":"first","affiliation":[{"name":"Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji Univ.  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuxian","family":"Zhang","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji Univ.  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiwei","family":"Chen","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji Univ.  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinyue","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Shanghai University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minghao","family":"Xue","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji Univ.  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Han","family":"Zhao","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji Univ.  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wen","family":"Li","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji Univ.  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhijian","family":"Yin","sequence":"additional","affiliation":[{"name":"Advanced Coatings &amp; New Materials Research Center Shanghai Shefei Surface Technology Co., Ltd. National University Science Park of Shanghai University of Electric Power  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8235-2338","authenticated-orcid":false,"given":"Jun","family":"Luo","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji Univ.  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1612-3294","authenticated-orcid":false,"given":"Yanzhong","family":"Pei","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji Univ.  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