Type-II Colloidal Quantum Wells: CdSe/CdTe Core/Crown Heteronanoplatelets

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dc.authorid0000-0003-1793-112Xen_US
dc.authorid0000-0003-1616-2728en_US
dc.authorid0000-0002-6250-6977
dc.authorid0000-0003-1793-112
dc.contributor.authorKelestemur, Yusuf
dc.contributor.authorOlutaş, Murat
dc.contributor.authorDelikanlı, Savaş
dc.contributor.authorGüzeltürk, Burak
dc.contributor.authorAkgül, Mehmet Zafer
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2021-06-23T19:42:22Z
dc.date.available2021-06-23T19:42:22Z
dc.date.issued2015
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_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 specific 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 similar 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.en_US
dc.identifier.doi10.1021/jp510466k
dc.identifier.endpage2185en_US
dc.identifier.issn1932-7447
dc.identifier.issue4en_US
dc.identifier.scopus2-s2.0-84921993216en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage2177en_US
dc.identifier.urihttps://doi.org/10.1021/jp510466k
dc.identifier.urihttps://hdl.handle.net/20.500.12491/8463
dc.identifier.volume119en_US
dc.identifier.wosWOS:000348753000064en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorOlutaş, Murat
dc.language.isoenen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.ispartofJournal Of Physical Chemistry Cen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.titleType-II Colloidal Quantum Wells: CdSe/CdTe Core/Crown Heteronanoplateletsen_US
dc.typeArticleen_US

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