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dc.contributor.authorDede, Didem
dc.contributor.authorTaghipour, Nima
dc.contributor.authorQuliyeva, Ulviyya
dc.contributor.authorSak, Mustafa
dc.contributor.authorKelestemur, Yusuf
dc.contributor.authorGüngör, Kıvanç
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2020-02-14T08:00:09Z
dc.date.available2020-02-14T08:00:09Z
dc.date.issued2019
dc.identifier.issn0897-4756
dc.identifier.urihttp://hdl.handle.net/11693/53353
dc.description.abstractSolution-processed type-II quantum wells exhibit outstanding optical properties, which make them promising candidates for light-generating applications including lasers and LEDs. However, they may suffer from poor colloidal stability under ambient conditions and show strong tendency to assemble into face-to-face stacks. In this work, to resolve the colloidal stability and uncontrolled stacking issues, we proposed and synthesized CdSe/CdSe1–xTex/CdS core/multicrown heteronanoplatelets (NPLs), controlling the amount of Te up to 50% in the crown without changing their thicknesses, which significantly increases their colloidal and photostability under ambient conditions and at the same time preserving their attractive optical properties. Confirming the final lateral growth of CdS sidewalls with X-ray photoelectron spectroscopy, energy-dispersive analysis, and photoelectron excitation spectroscopy, we found that the successful coating of this CdS crown around the periphery of conventional type-II NPLs prevents the unwanted formation of needle-like stacks, which results in reduction of the undesired scattering losses in thin-film samples of these NPLs. Owing to highly efficient exciton funneling from the outmost CdS crown accompanied by the reduced scattering and very low waveguide loss coefficient (∼18 cm–1), ultralow optical gain thresholds of multicrown type-II NPLs were achieved to be as low as 4.15 μJ/cm2 and 2.48 mJ/cm2 under one- and two-photon absorption pumping, respectively. These findings indicate that the strategy of using engineered advanced heterostructures of nanoplatelets provides solutions for improved colloidal stability and enables enhanced photonic performance.en_US
dc.language.isoEnglishen_US
dc.source.titleChemistry of Materialsen_US
dc.relation.isversionofhttps://dx.doi.org/10.1021/acs.chemmater.9b00136en_US
dc.subjectQuantum dotsen_US
dc.subjectCadmium sulfideen_US
dc.subjectChemical structureen_US
dc.subjectColloidal stabilityen_US
dc.subjectHeterostructuresen_US
dc.titleHighly stable multicrown heterostructures of type-II nanoplatelets for ultralow threshold optical gainen_US
dc.typeArticleen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology UNAMen_US
dc.citation.spage1818en_US
dc.citation.epage1826en_US
dc.citation.volumeNumber31en_US
dc.citation.issueNumber5en_US
dc.identifier.doi10.1021/acs.chemmater.9b00136en_US
dc.publisherAmerican Chemical Societyen_US
dc.contributor.bilkentauthorDede, Didem
dc.contributor.bilkentauthorTaghipour, Nima
dc.contributor.bilkentauthorQuliyeva, Ulviyya
dc.contributor.bilkentauthorSak, Mustafa
dc.contributor.bilkentauthorKelestemur, Yusuf
dc.contributor.bilkentauthorGüngör, Kıvanç
dc.contributor.bilkentauthorDemir, Hilmi Volkan


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