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Recently, FeS has attracted particular attentions due to the discovery of altermagnetism in bulk state. However, the intrinsic physical properties of 2D FeS are still unclear, since the syntheses of high\u2010quality FeS with thicknesses down to 2D limit remain challenging. Herein, we report the direct syntheses of thickness\u2010tunable, high\u2010quality 2D FeS flakes with low defect density and thus strict stoichiometry, via a space\u2010confined chemical vapor deposition (CVD) strategy. Significantly, we observe an unsaturated magnetoresistance with a crossover behavior (positive\u2010negative\u2010positive with decreasing the temperature from \u2248350 to \u22482 K), and an ultra\u2010high conductivity (\u22482.8 \u00d7 10\n                    <jats:sup>7<\/jats:sup>\n                    S m\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 2 K) in 2D FeS. Leveraging such high conductivity and robust air stability, we demonstrate 2D FeS as ideal contact electrodes in monolayer\u2010MoS\n                    <jats:sub>2<\/jats:sub>\n                    \u2010based field effect transistor, achieving a mobility more than 3 times higher than that of Ti\/Au\u2010contacted device. This work should hereby promote the fundamental property explorations of 2D nonlayered materials, and their applications in next\u2010generation electronic\/spintronic devices.\n                  <\/jats:p>","DOI":"10.1002\/adma.73877","type":"journal-article","created":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T04:01:13Z","timestamp":1782446473000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Space\u2010Confined Chemical Vapor Deposition of 2D FeS With Crossover Magnetoresistance and Ultra\u2010High Conductivity"],"prefix":"10.1002","volume":"38","author":[{"given":"Tong","family":"Zhou","sequence":"first","affiliation":[{"name":"Academy for Advanced Interdisciplinary Studies Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jialong","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lingmiao","family":"Ma","sequence":"additional","affiliation":[{"name":"Academy for Advanced Interdisciplinary Studies Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoqi","family":"Liu","sequence":"additional","affiliation":[{"name":"International Center for Quantum Materials School of Physics Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"You","family":"Peng","sequence":"additional","affiliation":[{"name":"Academy for Advanced Interdisciplinary Studies Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yahuan","family":"Huan","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yujin","family":"Cheng","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinhang","family":"Ji","sequence":"additional","affiliation":[{"name":"Academy for Advanced Interdisciplinary Studies Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuhang","family":"Jing","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuxue","family":"Zhou","sequence":"additional","affiliation":[{"name":"Academy for Advanced Interdisciplinary Studies Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haoxuan","family":"Ding","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fanqi","family":"Meng","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Peking University  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3626-0643","authenticated-orcid":false,"given":"Li","family":"Lin","sequence":"additional","affiliation":[{"name":"Academy for Advanced Interdisciplinary Studies Peking University  Beijing P. R. 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