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Defect and strain engineering techniques have been developed to produce high purity, deterministically placed SPE in WSe\n                    <jats:sub>2<\/jats:sub>\n                    . However, a major challenge in the application of these techniques is the low temperature required to observe defect\u2010bound TMD exciton emission, typically limiting SPE to\n                    <jats:italic>T<\/jats:italic>\n                    &lt; 30\u00a0K. SPE at higher temperatures either loses purity or requires integration into complex devices such as optical cavities. Here, 2D heterostructure engineering and molecular functionalization are combined to achieve high purity (&gt;90%) SPE in strained WSe\n                    <jats:sub>2<\/jats:sub>\n                    persisting to over\n                    <jats:italic>T<\/jats:italic>\n                    = 90\u00a0K. Covalent diazonium functionalization of graphite in layered WSe\n                    <jats:sub>2<\/jats:sub>\n                    \/graphite heterostructures maintains high purity up to\n                    <jats:italic>T<\/jats:italic>\n                    = 90\u00a0K and single\u2010photon source integrity up to\n                    <jats:italic>T<\/jats:italic>\n                    = 115\u00a0K. This method preserves the best qualities of SPE from WSe\n                    <jats:sub>2<\/jats:sub>\n                    while increasing working temperature to more than three times the typical range. This work demonstrates the versatility of surface functionalization and heterostructure design to synergistically improve the properties of quantum emission and offers new insights into the phenomenon of SPE from 2D\u00a0materials.\n                  <\/jats:p>","DOI":"10.1002\/advs.202511319","type":"journal-article","created":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T03:30:16Z","timestamp":1759894216000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["High\u2010Temperature Single\u2010Photon Emission From Covalently Functionalized van der Waals Heterostructures"],"prefix":"10.1002","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6585-2798","authenticated-orcid":false,"given":"S. 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