| Autor: |
Montanarella, Federico, Akkerman, Quinten A., Bonatz, Dennis, van der Sluijs, Maaike M., van der Bok, Johanna C., Prins, P. Tim, Aebli, Marcel, Mews, Alf, Vanmaekelbergh, Daniel, Kovalenko, Maksym V. |
| Zdroj: |
Nano Letters; 20230101, Issue: Preprints |
| Abstrakt: |
Despite broad interest in colloidal lead halide perovskite nanocrystals (LHP NCs), their intrinsic fast growth has prevented controlled synthesis of small, monodisperse crystals and insights into the reaction mechanism. Recently, a much slower synthesis of LHP NCs with extreme size control has been reported, based on diluted TOPO/PbBr2precursors and a diisooctylphosphinate capping ligand. We report new insights into the nucleation, growth, and self-assembly in this reaction, obtained by in situsynchrotron-based small-angle X-ray scattering and optical absorption spectroscopy. We show that dispersed 3 nm Cs[PbBr3] agglomerates are the key intermediate species: first, they slowly nucleate into crystals, and then they release Cs[PbBr3] monomers for further growth of the crystals. We show the merits of a low Cs[PbBr3] monomer concentration for the reaction based on oleate ligands. We also examine the spontaneous superlattice formation mechanism occurring when the growing nanocrystals in the solvent reach a critical size of 11.6 nm. |
| Databáze: |
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