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Several obstacles still limit the efficiencies of UV\u2010C LEDs. Devices in flip\u2010chip geometry suffer from a huge difference in the work functions between the p\u2010AlGaN and high\u2010reflective Al mirrors, whereas the absence of UV\u2010C transparent current spreading layers limits the development of UV\u2010C LEDs in standard geometry. Here it is demonstrated that transfer\u2010free graphene implemented directly onto the p\u2010AlGaN top layer by a plasma enhanced chemical vapor deposition approach enables highly efficient 275\u00a0nm UV\u2010C LEDs in both, flip\u2010chip and standard geometry. In flip\u2010chip geometry, the graphene acts as a contact interlayer between the Al\u2010mirror and the p\u2010AlGaN enabling an external quantum efficiency (EQE) of 9.5% and a wall\u2010plug efficiency (WPE) of 5.5% at 8\u00a0V. Graphene combined with a \u22481\u00a0nm NiO<jats:sub>x<\/jats:sub> support layer allows a turn\u2010on voltage &lt;5\u00a0V. In standard geometry graphene acts as a current spreading layer on a length scale up to 1\u00a0mm. These top\u2010emitting devices exhibit a EQE of 2.1% at 8.7\u00a0V and a WPE of 1.1%.<\/jats:p>","DOI":"10.1002\/adma.202313037","type":"journal-article","created":{"date-parts":[[2024,5,29]],"date-time":"2024-05-29T17:59:21Z","timestamp":1717005561000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Graphene\u2010Enhanced UV\u2010C LEDs"],"prefix":"10.1002","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0004-6992","authenticated-orcid":false,"given":"Johanna","family":"Meier","sequence":"first","affiliation":[{"name":"Werkstoffe der Elektrotechnik and CENIDE University of Duisburg\u2010Essen  Bismarckstra\u00dfe 81 47057 Duisburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hehe","family":"Zhang","sequence":"additional","affiliation":[{"name":"Werkstoffe der Elektrotechnik and CENIDE University of Duisburg\u2010Essen  Bismarckstra\u00dfe 81 47057 Duisburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Umut","family":"Kaya","sequence":"additional","affiliation":[{"name":"Werkstoffe der Elektrotechnik and CENIDE University of Duisburg\u2010Essen  Bismarckstra\u00dfe 81 47057 Duisburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wolfgang","family":"Mertin","sequence":"additional","affiliation":[{"name":"Werkstoffe der Elektrotechnik and CENIDE University of Duisburg\u2010Essen  Bismarckstra\u00dfe 81 47057 Duisburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8419-2158","authenticated-orcid":false,"given":"Gerd","family":"Bacher","sequence":"additional","affiliation":[{"name":"Werkstoffe der Elektrotechnik and CENIDE University of Duisburg\u2010Essen  Bismarckstra\u00dfe 81 47057 Duisburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,6,7]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.111832"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.200901349"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/admt.202101502"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/nphoton.2007.293"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566-019-0359-9"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1088\/0022-3727\/43\/35\/354002"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1088\/1361-6463\/ac021a"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1063\/5.0154031"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1063\/5.0015263"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/pssa.201700435"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1364\/PRJ.385275"},{"key":"e_1_2_8_12_1","volume":"9363","author":"Fujioka A.","year":"2015","journal-title":"Gall. 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