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      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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      Embargo Lift Date: 2020-02-22
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      Author(s)
      Yemliha, Yemliha
      Quliyeva, Ulviyya
      Güngör, Kıvanç
      Erdem, Onur
      Kelestemur, Yusuf
      Mutlugün, Evren
      Kovalenko, M.
      Demir, Hilmi Volkan
      Date
      2019
      Source Title
      Small
      Print ISSN
      1613-6810
      Publisher
      WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
      Volume
      15
      Issue
      8
      Pages
      1804854-1 - 1804854-11
      Language
      English
      Type
      Article
      Item Usage Stats
      164
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      305
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      Abstract
      Colloidal 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.
      Keywords
      Core/shell nanocrystals
      Hot‐injection growth
      Nanoplatelets
      Optical gain
      Semiconductor nanocrystals
      Stability
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      http://hdl.handle.net/11693/53242
      Published Version (Please cite this version)
      https://doi.org/10.1002/smll.201804854
      Collections
      • Department of Electrical and Electronics Engineering 3863
      • Department of Physics 2485
      • Institute of Materials Science and Nanotechnology (UNAM) 2098
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