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Stabilizing such a fragile many\u2010body state in reduced dimensions requires precise control of multiple electronic parameters and external perturbations, which makes its material realization challenging, particularly at high temperatures. Here, using van der Waals layers of  as a material platform, we show that the excitonic insulating phase is stable up to   190 K in the two\u2010dimensional limit. The distinctive signatures of the excitonic insulating phase transition, such as the hybridization gap opening and critical fluctuations of the excitonic order observed in Raman spectroscopy, persist even in a monolayer, although systematically suppressed with thickness. The large gap ratio, nearly independent of thickness, suggests the importance of strong exciton\u2010phonon coupling in maintaining a high\u2010temperature excitonic instability, while substrate\u2010induced strain disorder, as observed by scanning tunneling microscopy, lowers  in monolayer  than in the bulk. Our findings establish the monolayer  as a promising model system for studying and manipulating correlated exciton\u2010lattice coupling at the two dimensional\u00a0limit.<\/jats:p>","DOI":"10.1002\/advs.75569","type":"journal-article","created":{"date-parts":[[2026,5,11]],"date-time":"2026-05-11T21:23:01Z","timestamp":1778534581000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Observation of Excitonic Instability in a Monolayer Ta\n                    <sub>2<\/sub>\n                    NiSe\n                    <sub>5<\/sub>\n                    With Strain Disorder"],"prefix":"10.1002","volume":"13","author":[{"given":"So Young","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Physics Pohang University of Science and Technology (POSTECH)  Pohang South Korea"},{"name":"Department of Materials Science and Engineering Pohang University of Science and Technology  Pohang South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kwangrae","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics Pohang University of Science and Technology (POSTECH)  Pohang South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dowook","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics Pohang University of Science and Technology (POSTECH)  Pohang South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ji Eun","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Physics Yonsei University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jieun","family":"Seok","sequence":"additional","affiliation":[{"name":"Department of Physics Yonsei University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chang Il","family":"Kwon","sequence":"additional","affiliation":[{"name":"Department of Physics Pohang University of Science and Technology (POSTECH)  Pohang South Korea"},{"name":"Center for Artificial Low Dimensional Electronic Systems Institute for Basic Science (IBS)  Pohang South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jo Hyun","family":"Yun","sequence":"additional","affiliation":[{"name":"Department of Physics Pohang University of Science and Technology (POSTECH)  Pohang South Korea"},{"name":"Center for Artificial Low Dimensional Electronic Systems Institute for Basic Science (IBS)  Pohang South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chang\u2010Jong","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Physics Chungnam National University  Daejeon South Korea"},{"name":"Institute for Sciences of the Universe Chungnam National University  Daejeon South\u00a0Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jae Hoon","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics Yonsei University  Seoul South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H. 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