CdSe/CdSe1-xTex core/crown heteronanoplatelets: tuning the excitonic properties without changing the thickness

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage4658en_US
dc.citation.issueNumber8en_US
dc.citation.spage4650en_US
dc.citation.volumeNumber121en_US
dc.contributor.authorKelestemur Y.en_US
dc.contributor.authorGuzelturk, B.en_US
dc.contributor.authorErdem, O.en_US
dc.contributor.authorOlutas M.en_US
dc.contributor.authorErdem, T.en_US
dc.contributor.authorUsanmaz, C. F.en_US
dc.contributor.authorGungor K.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2018-04-12T11:09:10Z
dc.date.available2018-04-12T11:09:10Z
dc.date.issued2017en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractHere we designed and synthesized CdSe/CdSe1-xTex core/crown nanoplatelets (NPLs) with controlled crown compositions by using the core-seeded-growth approach. We confirmed the uniform growth of the crown regions with well-defined shape and compositions by employing transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. By precisely tuning the composition of the CdSe1-xTex crown region from pure CdTe (x = 1.00) to almost pure CdSe doped with several Te atoms (x = 0.02), we achieved tunable excitonic properties without changing the thickness of the NPLs and demonstrated the evolution of type-II electronic structure. Upon increasing the Te concentration in the crown region, we obtained continuously tunable photoluminescence peaks within the range of ∼570 nm (for CdSe1-xTex crown with x = 0.02) and ∼660 nm (for CdSe1-xTex crown with x = 1.00). Furthermore, with the formation of the CdSe1-xTex crown region, we observed substantially improved photoluminescence quantum yields (up to ∼95%) owing to the suppression of nonradiative hole trap sites. Also, we found significantly increased fluorescence lifetimes from ∼49 up to ∼326 ns with increasing Te content in the crown, suggesting the transition from quasi-type-II to type-II electronic structure. With their tunable excitonic properties, this novel material presented here will find ubiquitous use in various efficient light-emitting and -harvesting applications.en_US
dc.identifier.doi10.1021/acs.jpcc.6b11809en_US
dc.identifier.issn1932-7447
dc.identifier.urihttp://hdl.handle.net/11693/37299
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/acs.jpcc.6b11809en_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.subjectElectronic structureen_US
dc.subjectHigh resolution transmission electron microscopyen_US
dc.subjectLight emissionen_US
dc.subjectPhotoluminescenceen_US
dc.subjectTransmission electron microscopyen_US
dc.subjectTuningen_US
dc.subjectX ray diffractionen_US
dc.subjectExcitonic propertiesen_US
dc.subjectFluorescence lifetimesen_US
dc.subjectNano-plateletsen_US
dc.subjectNon-radiativeen_US
dc.subjectNovel materialsen_US
dc.subjectPhotoluminescence peaken_US
dc.subjectPhotoluminescence quantum yieldsen_US
dc.subjectSeeded growthen_US
dc.subjectX ray photoelectron spectroscopyen_US
dc.titleCdSe/CdSe1-xTex core/crown heteronanoplatelets: tuning the excitonic properties without changing the thicknessen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)