Cuboidal supraparticles self-assembled from cubic CsPbBr3 perovskite nanocrystals

Julia S. van der Burgt, Jaco J. Geuchies, Berend van der Meer, Hans Vanrompay, Daniele Zanaga, Yang Zhang, Wiebke Albrecht, Andrei V. Petukhov, Laura Filion, Sara Bals, Ingmar Swart, Daniël Vanmaekelbergh

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Colloidal CsPbBr3 nanocrystals (NCs) have emerged as promising candidates for various opto-electronic applications, such as light-emitting diodes, photodetectors, and solar cells. Here, we report on the self-assembly of cubic NCs from an organic suspension into ordered cuboidal supraparticles (SPs) and their structural and optical properties. Upon increasing the NC concentration or by addition of a nonsolvent, the formation of the SPs occurs homogeneously in the suspension, as monitored by in situ X-ray scattering measurements. The three-dimensional structure of the SPs was resolved through high-angle annular dark-field scanning transmission electron microscopy and electron tomography. The NCs are atomically aligned but not connected. We characterize NC vacancies on superlattice positions both in the bulk and on the surface of the SPs. The occurrence of localized atomic-type NC vacancies - instead of delocalized ones - indicates that NC-NC attractions are important in the assembly, as we verify with Monte Carlo simulations. Even when assembled in SPs, the NCs show bright emission, with a red shift of about 30 meV compared to NCs in suspension.

Originele taal-2Engels
Pagina's (van-tot)15706-15712
Aantal pagina's7
TijdschriftJournal of Physical Chemistry C
Nummer van het tijdschrift27
StatusGepubliceerd - 12 jul 2018


Citeer dit

van der Burgt, J. S., Geuchies, J. J., van der Meer, B., Vanrompay, H., Zanaga, D., Zhang, Y., ... Vanmaekelbergh, D. (2018). Cuboidal supraparticles self-assembled from cubic CsPbBr3 perovskite nanocrystals. Journal of Physical Chemistry C, 122(27), 15706-15712.