ABSTRACT Green‐emitting CsPbBr 3 perovskite nanocrystals (PNCs) with unconventional morphologies have recently emerged as an important class of materials because of their distinctive photophysical characteristics that are advantageous for device applications. Recent advances in ligand chemistry, precursor engineering, and facet‐controlled synthesis have enabled the development of diverse nanocrystal (NC) architectures, including rhombic dodecahedra, rhombicuboctahedra, spheroids, cube‐linked nanorods, and hexapod structures. Although these morphology‐engineered NCs largely preserve the steady state spectral signatures of conventional cubic counterparts, they exhibit significant improvements in several device‐relevant properties, such as decelerated hot carrier (HC) cooling, reduced optical gain thresholds for amplified spontaneous emission (ASE), prolonged biexciton lifetimes, and enhanced single (and entangled) photon emission. Morphology control also enables modulation of blinking through Auger processes and improves energy transfer (ET) efficiency, leading to enhanced catalytic activity. In this Perspective, we discuss recent progress in understanding the device‐relevant photophysics of CsPbBr 3 NCs across different morphologies and highlight the emerging structure–property relationships that govern their performance. We also highlight key challenges, including stability, reproducibility, scalability, and device integration while preserving the NC architecture, and discuss opportunities to extend these morphologies to chloride and iodide systems for broader optoelectronic and photovoltaic applications.
Acharjee et al. (Mon,) studied this question.