Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/143672
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
Quliyeva, Ulviyya
Gungor, Kivanc
Erdem, Onur
Kelestemur, Yusuf
Mutlugun, Evren
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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