Type-II colloidal quantum wells: CdSe/CdTe core/crown heteronanoplatelets

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage2185en_US
dc.citation.issueNumber4en_US
dc.citation.spage2177en_US
dc.citation.volumeNumber119en_US
dc.contributor.authorKeleştemur, Y.en_US
dc.contributor.authorOlutas M.en_US
dc.contributor.authorDelikanlı, S.en_US
dc.contributor.authorGüzeltürk, B.en_US
dc.contributor.authorAkgül, M. Z.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2016-02-08T10:09:25Z
dc.date.available2016-02-08T10:09:25Z
dc.date.issued2015en_US
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.abstractSolution-processed quantum wells, also known as colloidal nanoplatelets (NPLs), are emerging as promising materials for colloidal optoelectronics. In this work, we report the synthesis and characterization of CdSe/CdTe core/crown NPLs exhibiting a Type-II electronic structure and Type-II speci fic optical properties. Here, based on a core-seeded approach, the CdSe/CdTe core/crown NPLs were synthesized with well-controlled CdTe crown coatings. Uniform and epitaxial growth of CdTe crown region was verified by using structural characterization techniques including transmission electron microscopy (TEM) with quantitative EDX analysis and X-ray diffraction (XRD). Also the optical properties were systematically studied in these Type-II NPLs that reveal strongly red-shifted photoluminescence (up to ∼150 nm) along with 2 orders of magnitude longer fluorescence lifetimes (up to 190 ns) compared to the Type-I NPLs owing to spatially indirect excitons at the Type-II interface between the CdSe core and the CdTe crown regions. Photoluminescence excitation spectroscopy confirms that this strongly red-shifted emission actually arises from the CdSe/CdTe NPLs. In addition, temperature-dependent time-resolved fluorescence spectroscopy was performed to reveal the temperature-dependent fluorescence decay kinetics of the Type-II NPLs exhibiting interesting behavior. Also, water-soluble Type-II NPLs were achieved via ligand exchange of the CdSe/CdTe core/crown NPLs by using 3-mercaptopropionic acid (MPA), which allows for enhanced charge extraction efficiency owing to their shorter chain length and enables high quality film formation by layer-by-layer (LBL) assembly. With all of these appealing properties, the CdSe/CdTe core/crown heterostructures having Type-II electronic structure presented here are highly promising for light-harvesting applications. (Graph Presented). © 2015 American Chemical Society.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T10:09:25Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2015en
dc.identifier.doi10.1021/jp510466ken_US
dc.identifier.issn1932-7447
dc.identifier.urihttp://hdl.handle.net/11693/23136
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/jp510466ken_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.subjectCadmium tellurideen_US
dc.subjectElectronic structureen_US
dc.subjectFluorescenceen_US
dc.subjectFluorescence spectroscopyen_US
dc.subjectOptical propertiesen_US
dc.subjectPhotoluminescenceen_US
dc.subjectTransmission electron microscopyen_US
dc.subjectX ray diffractionen_US
dc.subject3 - mercaptopropionic aciden_US
dc.subjectColloidal quantum wellsen_US
dc.subjectLayer - by - layer assembliesen_US
dc.subjectPhotoluminescence excitation spectroscopyen_US
dc.subjectStructural characterizationen_US
dc.subjectSynthesis and characterizationsen_US
dc.subjectTemperature dependent fluorescenceen_US
dc.subjectTime - resolved fluorescence spectroscopyen_US
dc.subjectSemiconductor quantum wellsen_US
dc.titleType-II colloidal quantum wells: CdSe/CdTe core/crown heteronanoplateletsen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
Institute of Materials Science and Nanotechnology (UNAM)
Nanotechnology Research Center (NANOTAM)