Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 44, Pages 13887-13892Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201605909
Keywords
HAADF-STEM; nanocrystals; perovskites; quantum confinement; ultrasonication
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Funding
- Bavarian State Ministry of Science, Research, and Arts
- China Scholarship Council
- Alexander von Humboldt-Stiftung
- European Union
- Scientific and Technological Research Council of Turkey
- Flemish Fund for Scientific Research (FWO Vlaanderen)
- European Research Council (ERC) [335078-COLOURATOMS]
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We describe the simple, scalable, single-step, and polar-solvent-free synthesis of high-quality colloidal CsPbX3 (X=Cl, Br, and I) perovskite nanocrystals (NCs) with tunable halide ion composition and thickness by direct ultrasonication of the corresponding precursor solutions in the presence of organic capping molecules. High angle annular dark field scanning transmission electron microscopy (HAADF-STEM) revealed the cubic crystal structure and surface termination of the NCs with atomic resolution. The NCs exhibit high photoluminescence quantum yields, narrow emission line widths, and considerable air stability. Furthermore, we investigated the quantum size effects in CsPbBr3 and CsPbI3 nanoplatelets by tuning their thickness down to only three to six monolayers. The high quality of the prepared NCs (CsPbBr3) was confirmed by amplified spontaneous emission with low thresholds. The versatility of this synthesis approach was demonstrated by synthesizing different perovskite NCs.
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