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|Title:||Highly stable, near-unity efficiency atomically flat semiconductor nanocrystals of CdSe/ZnS hetero-nanoplatelets enabled by ZnS-shell hot-injection growth||Authors:||Altintas, Yemliha
Kovalenko, Maksym V.
Demir, Hilmi Volkan
|Keywords:||Engineering::Materials||Issue Date:||2019||Source:||Altintas, Y., Quliyeva, U., Gungor, K., Erdem, O., Kelestemur, Y., Mutlugun, E., ... Demir, H. V. (2019). Highly stable, near-unity efficiency atomically flat semiconductor nanocrystals of CdSe/ZnS hetero-nanoplatelets enabled by ZnS-shell hot-injection growth. Small, 15(8), 1804854-. doi:10.1002/smll.201804854||Journal:||Small||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.||URI:||https://hdl.handle.net/10356/143672||ISSN:||1613-6810||DOI:||10.1002/smll.201804854||Rights:||This is the accepted version of the follwoing article: Altintas, Y., Quliyeva, U., Gungor, K., Erdem, O., Kelestemur, Y., Mutlugun, E., ... Demir, H. V. (2019). Highly stable, near-unity efficiency atomically flat semiconductor nanocrystals of CdSe/ZnS hetero-nanoplatelets enabled by ZnS-shell hot-injection growth. Small, 15(8), 1804854-. doi:10.1002/smll.201804854, which has been published in final form at 10.1002/smll.201804854. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html].||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||EEE Journal Articles|
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