Gradient Type-II CdSe/CdSeTe/CdTe Core/Crown/Crown heteronanoplatelets with asymmetric shape and disproportional excitonic properties

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buir.contributor.authorShabani, Farzan
buir.contributor.authorShermet, Nina
buir.contributor.authorKorkut, Hilal
buir.contributor.authorSarpkaya, İbrahim
buir.contributor.authorBaruj, Hamed Dehghanpour
buir.contributor.authorDelikanlı, Savaş
buir.contributor.authorIşık, Furkan
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidShabani, Farzan|0000-0003-2174-5960
buir.contributor.orcidSarpkaya, İbrahim|0000-0002-1181-6174
buir.contributor.orcidBaruj, Hamed Dehghanpour|0000-0003-3822-6622
buir.contributor.orcidIşık, Furkan|0000-0001-5881-5438
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage2205729-10en_US
dc.citation.issueNumber11
dc.citation.spage2205729-1
dc.citation.volumeNumber19
dc.contributor.authorShabani, Farzan
dc.contributor.authorHernandez Martinez, P. L.
dc.contributor.authorShermet, Nina
dc.contributor.authorKorkut, Hilal
dc.contributor.authorSarpkaya, İbrahim
dc.contributor.authorBaruj, Hamed Dehghanpour
dc.contributor.authorDelikanlı, Savaş
dc.contributor.authorIşık, Furkan
dc.contributor.authorDurmuşoğlu, E. G.
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2024-03-18T11:58:34Z
dc.date.available2024-03-18T11:58:34Z
dc.date.issued2023-01-17
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)
dc.description.abstractCharacterized by their strong 1D confinement and long-lifetime red-shifted emission spectra, colloidal nanoplatelets (NPLs) with type-II electronic structure provide an exciting ground to design complex heterostructures with remarkable properties. This work demonstrates the synthesis and optical characterization of CdSe/CdSeTe/CdTe core/crown/crown NPLs having a step-wise gradient electronic structure and disproportional wavefunction distribution, in which the excitonic properties of the electron and hole can be finely tuned through adjusting the geometry of the intermediate crown. The first crown with staggered configuration gives rise to a series of direct and indirect transition channels that activation/deactivation of each channel is possible through wavefunction engineering. Moreover, these NPLs allow for switching between active channels with temperature, where lattice contraction directly affects the electron–hole (e–h) overlap. Dominated by the indirect transition channels over direct transitions, the lifetime of the NPLs starts to increase at 9 K, indicative of low dark-bright exciton splitting energy. The charge transfer states from the two type-II interfaces promote a large number of indirect transitions, which effectively increase the absorption of low-energy photons critical for nonlinear properties. As a result, these NPLs demonstrate exceptionally high two-photon absorption cross-sections with the highest value of 12.9 × 10$^{6}$ GM and superlinear behavior.
dc.description.provenanceMade available in DSpace on 2024-03-18T11:58:34Z (GMT). No. of bitstreams: 1 Gradient_type_II_CdSe_CdSeTe_CdTe_core_crown_crown_heteronanoplatelets_with_asymmetric_shape_and_disproportional_excitonic_properties.pdf: 1981216 bytes, checksum: 22fb354838fe0c0f9c4d5aad788ce1b4 (MD5) Previous issue date: 2023-01-17en
dc.embargo.release2024-01-17
dc.identifier.doi10.1002/smll.202205729
dc.identifier.eissn1613-6829
dc.identifier.issn1613-6810
dc.identifier.urihttps://hdl.handle.net/11693/114896
dc.language.isoen
dc.publisherWiley-VCH Verlag GmbH & Co. KGaA
dc.relation.isversionofhttps://dx.doi.org/10.1002/smll.202205729
dc.rightsCC BY-NC-ND 4.0 DEED (Attribution-NonCommercial-NoDerivs 4.0 International)
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.source.titleSmall
dc.subjectColloidal quantum wells
dc.subjectSemiconductor nanoplatelets
dc.subjectTwo-photon absorption
dc.subjectWavefunction engineering
dc.titleGradient Type-II CdSe/CdSeTe/CdTe Core/Crown/Crown heteronanoplatelets with asymmetric shape and disproportional excitonic properties
dc.typeArticle

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