Highly stable, near-unity efficiency atomically flat semiconductor nanocrystals of CdSe/ZnS hetero-nanoplatelets enabled by ZnS-Shell hot-injection growth

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buir.contributor.authorYemliha, Yemliha
buir.contributor.authorQuliyeva, Ulviyya
buir.contributor.authorGüngör, Kıvanç
buir.contributor.authorErdem, Onur
buir.contributor.authorKelestemur, Yusuf
buir.contributor.authorMutlugün, Evren
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage1804854-11en_US
dc.citation.issueNumber8en_US
dc.citation.spage1804854-1en_US
dc.citation.volumeNumber15en_US
dc.contributor.authorYemliha, Yemlihaen_US
dc.contributor.authorQuliyeva, Ulviyyaen_US
dc.contributor.authorGüngör, Kıvançen_US
dc.contributor.authorErdem, Onuren_US
dc.contributor.authorKelestemur, Yusufen_US
dc.contributor.authorMutlugün, Evrenen_US
dc.contributor.authorKovalenko, M.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2020-02-11T06:19:16Z
dc.date.available2020-02-11T06:19:16Z
dc.date.issued2019
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.abstractColloidal semiconductor nanoplatelets (NPLs) offer important benefits in nanocrystal optoelectronics with their unique excitonic properties. For NPLs, colloidal atomic layer deposition (c‐ALD) provides the ability to produce their core/shell heterostructures. However, as c‐ALD takes place at room temperature, this technique allows for only limited stability and low quantum yield. Here, highly stable, near‐unity efficiency CdSe/ZnS NPLs are shown using hot‐injection (HI) shell growth performed at 573 K, enabling routinely reproducible quantum yields up to 98%. These CdSe/ZnS HI‐shell hetero‐NPLs fully recover their initial photoluminescence (PL) intensity in solution after a heating cycle from 300 to 525 K under inert gas atmosphere, and their solid films exhibit 100% recovery of their initial PL intensity after a heating cycle up to 400 K under ambient atmosphere, by far outperforming the control group of c‐ALD shell‐coated CdSe/ZnS NPLs, which can sustain only 20% of their PL. In optical gain measurements, these core/HI‐shell NPLs exhibit ultralow gain thresholds reaching ≈7 µJ cm−2. Despite being annealed at 500 K, these ZnS‐HI‐shell NPLs possess low gain thresholds as small as 25 µJ cm−2. These findings indicate that the proposed 573 K HI‐shell‐grown CdSe/ZnS NPLs hold great promise for extraordinarily high performance in nanocrystal optoelectronics.en_US
dc.description.provenanceSubmitted by Onur Emek (onur.emek@bilkent.edu.tr) on 2020-02-11T06:19:16Z No. of bitstreams: 1 Bilkent-research-paper.pdf: 268963 bytes, checksum: ad2e3a30c8172b573b9662390ed2d3cf (MD5)en
dc.description.provenanceMade available in DSpace on 2020-02-11T06:19:16Z (GMT). No. of bitstreams: 1 Bilkent-research-paper.pdf: 268963 bytes, checksum: ad2e3a30c8172b573b9662390ed2d3cf (MD5) Previous issue date: 2019en
dc.description.sponsorshipSingapore National Research Foundation. Grant Numbers: NRF‐NRFI2016‐08, NRF‐CRP‐6‐2010‐02en_US
dc.description.sponsorshipAgency for Science, Technology and Research. Grant Numbers: 114F326, 115E679en_US
dc.description.sponsorshipAbdullah Gul University Scientific Research. Grant Number: FDK‐2017‐96en_US
dc.description.sponsorshipMarie Skłodowska‐Curie. Grant Number: 798697en_US
dc.embargo.release2020-02-22
dc.identifier.doi10.1002/smll.201804854en_US
dc.identifier.issn1613-6810
dc.identifier.urihttp://hdl.handle.net/11693/53242
dc.language.isoEnglishen_US
dc.publisherWILEY-VCH Verlag GmbH & Co. KGaA, Weinheimen_US
dc.relation.isversionofhttps://doi.org/10.1002/smll.201804854en_US
dc.source.titleSmallen_US
dc.subjectCore/shell nanocrystalsen_US
dc.subjectHot‐injection growthen_US
dc.subjectNanoplateletsen_US
dc.subjectOptical gainen_US
dc.subjectSemiconductor nanocrystalsen_US
dc.subjectStabilityen_US
dc.titleHighly stable, near-unity efficiency atomically flat semiconductor nanocrystals of CdSe/ZnS hetero-nanoplatelets enabled by ZnS-Shell hot-injection growthen_US
dc.typeArticleen_US

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