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Here, we present a remarkable thermoelectric figure of merit (zT) of \u223c1.8 at 873\u00a0K in\n                    <jats:italic>n<\/jats:italic>\n                    \u2010type PbSe doped with MoCl\n                    <jats:sub>5<\/jats:sub>\n                    by modulation of the conduction bands, while simultaneously suppressing the phonon transport. Doping MoCl\n                    <jats:sub>5<\/jats:sub>\n                    in PbSe induces notable convergence of conduction bands and an increased density of states near the Fermi level, mainly due to the contribution of Mo 4\n                    <jats:italic>d<\/jats:italic>\n                    orbital hybridized with the Se 4\n                    <jats:italic>p<\/jats:italic>\n                    \u2010Pb 6\n                    <jats:italic>p<\/jats:italic>\n                    . This results in an improved Seebeck coefficient, despite maintaining a high\n                    <jats:italic>n<\/jats:italic>\n                    \u2010type charge carrier concentration resulting in an excellent power factor (\u03c3S\n                    <jats:sup>2<\/jats:sup>\n                    ) of \u223c21 \u00b5W cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    K\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 873\u00a0K for PbSe\u00a0+\u00a01 mol% MoCl\n                    <jats:sub>5<\/jats:sub>\n                    . When the solid solution limit of the doping exceeds, it forms unique modular nano\u2010heterostructures (5\u201030\u00a0nm) of PbSe\u2010MoSe\n                    <jats:sub>2<\/jats:sub>\n                    misfit layered compounds embedded in PbSe matrix. These nano\u2010heterostructures significantly intensify phonon scattering, leading to an ultralow lattice thermal conductivity (\u03ba\n                    <jats:sub>lat<\/jats:sub>\n                    ) of 0.20\u00a0W\u00a0m\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0K\n                    <jats:sup>\u22121<\/jats:sup>\n                    at \u223c725\u00a0K in PbSe\u00a0+\u00a01 mol% MoCl\n                    <jats:sub>5<\/jats:sub>\n                    sample.\n                  <\/jats:p>","DOI":"10.1002\/anie.202510305","type":"journal-article","created":{"date-parts":[[2025,7,8]],"date-time":"2025-07-08T10:43:56Z","timestamp":1751971436000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Conduction Band Convergence and Modular Nanostructures: Driving High Thermoelectric Performance in\n                    <i>n<\/i>\n                    \u2010Type PbSe"],"prefix":"10.1002","volume":"64","author":[{"given":"Indrajit","family":"Haldar","sequence":"first","affiliation":[{"name":"New Chemistry Unit International Centre for Materials Science and School of Advanced Materials Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR)  Jakkur P.O. 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Bangalore 560064 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Naveen","family":"Goyal","sequence":"additional","affiliation":[{"name":"Materials Research Centre Indian Institute of Science  Bangalore 560012 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammad","family":"Ubaid","sequence":"additional","affiliation":[{"name":"Department of Physics Indian Institute of Technology Kanpur  Kanpur 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Debattam","family":"Sarkar","sequence":"additional","affiliation":[{"name":"New Chemistry Unit International Centre for Materials Science and School of Advanced Materials Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR)  Jakkur P.O. 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