Issue 41, 2021

Mechanistic studies of CsPbBr3 superstructure formation

Abstract

All-inorganic perovskite superstructures (SCs) were recently reported to have formed through the self-assembly of perovskite nanocrystals (NCs) in hot injection synthesis. The presence of SCs leads to miniband formation in both conduction and valence bands and a red-shifted emission. The formation process of SCs is highly attractive and has so far been attributed to the van der Waals attraction between hydrophobic ligands and perovskite NCs at higher concentrations. However, there was no study to confirm this. Herein, we propose a new mechanism for CsPbBr3 SC formation via cooling method manipulation and varying the amount of PbBr2. We found that the amount of PbBr2 is crucial for SC formation although an excess of PbBr2 prevents SC formation. We also proposed that excess PbBr2 could occupy Br vacancies to form CsPbBr3–PbBr2 linkages which assemble into CsPbBr3 SCs. To the best of our knowledge, this is the first study to explain the importance of the amount of PbBr2 in CsPbBr3 SC formation. We obtained a maximum 34 nm total shift of CsPbBr3 emission, demonstrating the huge potential of SCs in emission tuning. Our mechanism to explain the SC formation would contribute to the rational design of CsPbX3 light emitting diodes, lasers, and other optoelectronic devices.

Graphical abstract: Mechanistic studies of CsPbBr3 superstructure formation

Supplementary files

Article information

Article type
Paper
Submitted
01 jul 2021
Accepted
22 sep 2021
First published
22 sep 2021

J. Mater. Chem. C, 2021,9, 14699-14708

Mechanistic studies of CsPbBr3 superstructure formation

W. K. Chan, D. Zhou, Z. Yu and T. T. Y. Tan, J. Mater. Chem. C, 2021, 9, 14699 DOI: 10.1039/D1TC03066C

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