Publication

The Benefit and Challenges of Zero-Dimensional Perovskites

The Benefit and Challenges of Zero-Dimensional Perovskites
Jawaher M. Almutlaq, Jun Yin, Omar F. Mohammed, Osman M. Bakr
The Journal of Physical Chemistry Letters​
Jawaher M. Almutlaq, Jun Yin, Omar F. Mohammed, Osman M. Bakr
Perovskite
2018

To break free of the limitations imposed by three-dimensional (3D) perovskites, such as their lackluster stability, researchers have opened new frontiers into lower-dimensional perovskite derivatives. Thanks to advances in solvent-based synthesis methods, zero-dimensional (0D) inorganic perovskites, mainly Cs4PbBr6, have recently reemerged in various forms (from single crystals to nanocrystals) as materials with properties that bridge organic molecules and inorganic semiconductors. These properties include intrinsic Pb2+ ion emission, large exciton binding energy, and small polaron formation upon photoexcitation, in addition to anomalous green photoluminescence with improved stability and high quantum yield. Moreover, the demonstration of Cs4PbBr6-based LED devices highlights the accelerating efforts towards their application and motivates further investigations of these emerging materials. This perspective summarizes the progress in the field of 0D Cs4PbBr6 perovskites, focusing on their molecular-electronic properties and hotly debated green photoluminescence. We conclude by presenting the implications of the unique findings and suggesting opportunities for the future development and applications of these 0D perovskites.​
DOI: 10.1021/acs.jpclett.8b00532