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Defects activated photoluminescence in two-dimensional semiconductors: interplay between bound, charged, and free excitons

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dc.contributor.authorTongay, Sefaattin-
dc.contributor.authorSuh, Joonki-
dc.contributor.authorAtaca, Can-
dc.contributor.authorFan, Wen-
dc.contributor.authorLuce, Alexander-
dc.contributor.authorKang, Jeong Seuk-
dc.contributor.authorLiu, Jonathan-
dc.contributor.authorKo, Changhyun-
dc.contributor.authorRaghunathanan, Rajamani-
dc.contributor.authorZhou, Jian-
dc.contributor.authorOgletree, Frank-
dc.contributor.authorLi, Jingbo-
dc.contributor.authorGrossman, Jeffrey C.-
dc.contributor.authorWu, Junqiao-
dc.date.accessioned2022-04-19T10:09:12Z-
dc.date.available2022-04-19T10:09:12Z-
dc.date.issued2013-09-
dc.identifier.issn2045-2322-
dc.identifier.urihttps://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147424-
dc.description.abstractPoint defects in semiconductors can trap free charge carriers and localize excitons. The interaction between these defects and charge carriers becomes stronger at reduced dimensionalities, and is expected to greatly influence physical properties of the hosting material. We investigated effects of anion vacancies in monolayer transition metal dichalcogenides as two-dimensional (2D) semiconductors where the vacancies density is controlled by alpha-particle irradiation or thermal-annealing. We found a new, sub-bandgap emission peak as well as increase in overall photoluminescence intensity as a result of the vacancy generation. Interestingly, these effects are absent when measured in vacuum. We conclude that in opposite to conventional wisdom, optical quality at room temperature cannot be used as criteria to assess crystal quality of the 2D semiconductors. Our results not only shed light on defect and exciton physics of 2D semiconductors, but also offer a new route toward tailoring optical properties of 2D semiconductors by defect engineering.-
dc.language영어-
dc.language.isoENG-
dc.publisherNATURE PUBLISHING GROUP-
dc.titleDefects activated photoluminescence in two-dimensional semiconductors: interplay between bound, charged, and free excitons-
dc.typeArticle-
dc.publisher.location영국-
dc.identifier.doi10.1038/srep02657-
dc.identifier.scopusid2-s2.0-84884246363-
dc.identifier.wosid000324285000005-
dc.identifier.bibliographicCitationSCIENTIFIC REPORTS, v.3-
dc.citation.titleSCIENTIFIC REPORTS-
dc.citation.volume3-
dc.description.isOpenAccessN-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.subject.keywordPlusMolybdenum Disulfide-
dc.subject.keywordPlusMonolayer-
dc.subject.keywordPlusVan Der Waals-
dc.identifier.urlhttps://www.nature.com/articles/srep02657-
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