Impurity incorporation and exchange interactions in Co2+-doped CdSe/CdS core/shell nanoplatelets

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buir.contributor.authorDelikanlı, Savaş
buir.contributor.authorIşık, Furkan
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage224708-10en_US
dc.citation.issueNumber22en_US
dc.citation.spage224708-1en_US
dc.citation.volumeNumber151en_US
dc.contributor.authorFainblat, R.en_US
dc.contributor.authorDelikanlı, Savaşen_US
dc.contributor.authorSpee, L.en_US
dc.contributor.authorCzerny, T.en_US
dc.contributor.authorIşık, Furkanen_US
dc.contributor.authorSharma, V. K.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.contributor.authorBacher, G.en_US
dc.date.accessioned2020-02-13T07:47:45Z
dc.date.available2020-02-13T07:47:45Z
dc.date.issued2019
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractThe intentional incorporation of transition metal impurities into colloidal semiconductor nanocrystals allows an extension of the host material’s functionality. While dopant incorporation has been extensively investigated in zero-dimensional quantum dots, the substitutional replacement of atoms in two-dimensional (2D) nanostructures by magnetic dopants has been reported only recently. Here, we demonstrate the successful incorporation of Co2+ ions into the shell of CdSe/CdS core/shell nanoplatelets, using these ions (i) as microscopic probes for gaining distinct structural insights and (ii) to enhance the magneto-optical functionality of the host material. Analyzing interatomic Co2+ ligand field transitions, we conclude that Co2+ is incorporated into lattice sites of the CdS shell, and effects such as diffusion of dopants into the CdSe core or diffusion of the dopants out of the heterostructure causing self-purification play a minor role. Taking advantage of the absorption-based technique of magnetic circular dichroism, we directly prove the presence of sp-d exchange interactions between the dopants and the band charge carriers in CdSe/Co2+:CdS heteronanoplatelets. Thus, our study not only demonstrates magneto-optical functionality in 2D nanocrystals by Co2+ doping but also shows that a careful choice of the dopant type paves the way for a more detailed understanding of the impurity incorporation process into these novel 2D colloidal materials.en_US
dc.identifier.doi10.1063/1.5129391en_US
dc.identifier.issn0021-9606
dc.identifier.urihttp://hdl.handle.net/11693/53329
dc.language.isoEnglishen_US
dc.publisherAmerican Institute of Physicsen_US
dc.relation.isversionofhttps://dx.doi.org/10.1063/1.5129391en_US
dc.source.titleJournal of Chemical Physicsen_US
dc.subjectDopingen_US
dc.subjectNanocrystalsen_US
dc.subjectExchange interactionsen_US
dc.subjectLigand fieldsen_US
dc.subjectAtomic layer depositionen_US
dc.subjectHeterostructuresen_US
dc.subjectNanoplateleten_US
dc.subjectMagnetic circular dichroism spectroscopyen_US
dc.titleImpurity incorporation and exchange interactions in Co2+-doped CdSe/CdS core/shell nanoplateletsen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
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