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Realizing high\u2010performance p\u2010type transistors, however, remains challenging due to Fermi\u2010level pinning, high contact resistance, and poorly defined interfaces in conventional stepwise fabrication. Here, we demonstrate a single\u2010step tellurization growth strategy that simultaneously forms PtTe\n                    <jats:sub>2<\/jats:sub>\n                    contacts on 2H\u2010MoTe\n                    <jats:sub>2<\/jats:sub>\n                    channels to directly realize 2D semiconductor transistors. This approach forms PtTe\n                    <jats:sub>2<\/jats:sub>\n                    \/2H\u2010MoTe\n                    <jats:sub>2<\/jats:sub>\n                    metal\/semiconductor arrays with precise control of the MoTe\n                    <jats:sub>2<\/jats:sub>\n                    phase at the PtTe\n                    <jats:sub>2<\/jats:sub>\n                    electrode interface, while providing integrated van der Waals metallic contacts without the need for post\u2010growth of metal contacts. Using this method, we achieve wafer\u2010scale heterophase arrays characterized by uniform patterning and well\u2010controlled 2H\/1T' phase transformation dynamics. The heterojunctions display sharp and clean interfaces, as verified by TEM, STEM, and EDS mapping. Transistor arrays fabricated from these heterophase structures show Ohmic contacts with low Schottky barrier heights, delivering on\/off ratios up to 5 \u00d7 10\n                    <jats:sup>4<\/jats:sup>\n                    and consistent mobility of 5\u20139 cm\n                    <jats:sup>2<\/jats:sup>\n                    \/Vs across 100 devices, ensuring efficient carrier injection. Our results establish a scalable pathway for the direct growth of 2D semiconductor transistors, overcoming conventional multi\u2010step device fabrication bottlenecks and providing a promising platform for large\u2010scale, and reproducible 2D electronics.\n                  <\/jats:p>","DOI":"10.1002\/adma.202522270","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T18:28:25Z","timestamp":1772994505000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Direct Growth of Wafer\u2010Scale 2D Semiconductor Transistors via One\u2010Step PtTe\n                    <sub>2<\/sub>\n                    \/2H\u2010MoTe\n                    <sub>2<\/sub>\n                    Heterophase Formation"],"prefix":"10.1002","volume":"38","author":[{"given":"Qin","family":"Shuai","sequence":"first","affiliation":[{"name":"Key Laboratory for Micro\u2010Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo\/Biosensing and Chemometrics State Key Laboratory of Advanced Design and Manufacturing Technology For Vehicle Hunan Institute of Optoelectronic Integration College of Materials Science and Engineering Hunan University  Changsha China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qijun","family":"Zong","sequence":"additional","affiliation":[{"name":"Key Laboratory for Micro\u2010Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo\/Biosensing and Chemometrics State Key Laboratory of Advanced Design and Manufacturing Technology For Vehicle Hunan Institute of Optoelectronic Integration College of Materials Science and Engineering Hunan University  Changsha China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiali","family":"Yi","sequence":"additional","affiliation":[{"name":"Key Laboratory for Micro\u2010Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo\/Biosensing and Chemometrics State Key Laboratory of Advanced Design and Manufacturing Technology For Vehicle Hunan Institute of Optoelectronic Integration College of Materials Science and Engineering Hunan University  Changsha China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tian","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Micro\u2010Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo\/Biosensing and Chemometrics State Key Laboratory of Advanced Design and Manufacturing Technology For Vehicle Hunan Institute of Optoelectronic Integration College of Materials Science and Engineering Hunan University  Changsha China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huawei","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Physics and Electronics Hunan Normal University  Changsha Hunan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhaoqian","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Micro\u2010Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo\/Biosensing and Chemometrics State Key Laboratory of Advanced Design and Manufacturing Technology For Vehicle Hunan Institute of Optoelectronic Integration College of Materials Science and Engineering Hunan University  Changsha China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haifeng","family":"Wu","sequence":"additional","affiliation":[{"name":"Key Laboratory for Micro\u2010Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo\/Biosensing and Chemometrics State Key Laboratory of Advanced Design and Manufacturing Technology For Vehicle Hunan Institute of Optoelectronic Integration College of Materials Science and Engineering Hunan University  Changsha 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