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Lett."],"published-print":{"date-parts":[[2026,5,1]]},"abstract":"<jats:p>\n                    We report an all-group-IV photodiode enabling extended shortwave infrared detection by integrating sputtered Ge\n                    <jats:sub>0.84<\/jats:sub>\n                    Sn\n                    <jats:sub>0.16<\/jats:sub>\n                    quantum dots (QDs) on a graphene (Gr)\/n-Ge substrate via quasi-van der Waals epitaxy. The Fermi level depinning of n-Ge by Gr and work function modulation of Gr by GeSn QDs enhance the Schottky barrier height between GeSn-QDs decorated Gr and n-Ge to 0.49\u2009eV, thus suppressing the dark current. The GeSn QDs facilitate the extension of the detection range up to 2400\u2009nm and naturally act as hole trapping centers producing photocurrent gain. Consequently, high responsivities of 2.4\/1.8\u2009A\/W at 1310\/1550\u2009nm with corresponding detectivities of 1.4\u2009\u00d7\u200910\n                    <jats:sup>10<\/jats:sup>\n                    \/1.1\u2009\u00d7\u200910\n                    <jats:sup>10<\/jats:sup>\n                    Jones alongside a fast response time of &lt;60\u2009\u00b5s were achieved. This approach presents a robust, cost-effective solution for extending the spectral range of Si-based photonics.\n                  <\/jats:p>","DOI":"10.1364\/ol.596692","type":"journal-article","created":{"date-parts":[[2026,4,6]],"date-time":"2026-04-06T14:00:13Z","timestamp":1775484013000},"page":"2400","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["GeSn QD decorated graphene\/n-Ge mixed-dimensional heterostructure for extended shortwave infrared detection"],"prefix":"10.1364","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1794-2427","authenticated-orcid":true,"given":"Haokun","family":"Ding","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00mcjh785","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li","family":"Jiang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00mcjh785","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Wang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00mcjh785","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1784-5029","authenticated-orcid":true,"given":"Guangyang","family":"Lin","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00mcjh785","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cheng","family":"Li","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00mcjh785","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,4,16]]},"reference":[{"key":"ol-51-9-2400-R2","doi-asserted-by":"publisher","first-page":"891","DOI":"10.1007\/s12274-020-2749-1","type":"journal-article","volume":"13","author":"Wang","year":"2020","journal-title":"Nano Res."},{"key":"ol-51-9-2400-R3","doi-asserted-by":"publisher","first-page":"061111","DOI":"10.1063\/1.4961059","type":"journal-article","volume":"109","author":"Aleshkin","year":"2016","journal-title":"Appl. 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All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.","name":"copyright","label":"Copyright"}]}}