期刊
SMALL
卷 15, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201804854
关键词
core/shell nanocrystals; hot-injection growth; nanoplatelets; optical gain; semiconductor nanocrystals; stability
类别
资金
- Singapore National Research Foundation [NRF-NRFI2016-08, NRF-CRP-6-2010-02]
- Agency for Science, Technology and Research (A*STAR) of Singapore
- TUBITAK [114F326, 115E679]
- ESF-EURYI
- TUBA
- TUBA-GEBIP
- Abdullah Gul University Scientific Research Project [FDK-201796]
- TUBITAK BIDEB 2211 program
- European Union's Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie grant [798697]
- Scientific Center for Optical and Electron Microscopy (ScopeM) of the Swiss Federal Institute of Technology ETHZ
- Marie Curie Actions (MSCA) [798697] Funding Source: Marie Curie Actions (MSCA)
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 approximate to 7 mu J cm(-2). Despite being annealed at 500 K, these ZnS-HI-shell NPLs possess low gain thresholds as small as 25 mu J 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.
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