Cesium lead halide perovskite nanocrystals have generated considerable attention in the recent past due to their appealing properties such as high absorption coefficient in the entire visible spectral region, narrow and intense emission which is tuneable by the halide ion composition, high defect tolerance ability, and long charge carrier diffusion lengths.1 These nanocrystals (NCs) are considered as potential candidates for fabricating new-generation optical devices, mainly because they can be prepared with desirable dimensionality.2 In order to understand the photon-electron interactions in these materials, the present study examines the charge carrier dynamics in the NCs under varied circumstances. Experimental results taken together suggest that apart from the electronic structure of the nanoclusters, surface-protecting ligands of the colloidal NCs play a vital role in controlling the charge transfer dynamics at the donor-acceptor interface.3 Further, the study also explores the effect of doping at the Pb2+ sites on exciton dynamics, in terms of exciton-phonon interactions.4 Finally, the effect of surfactant on exciton dynamics in cesium lead bromide-based core/shell hetero-structures has been examined. The colloquium will present detailed analysis of the impact of these factors on the exciton dynamics in the NCs and also discuss ways of achieving desirable properties in favour of practical field applications.

References
1. J. S. Manser, J. A. Christians, P. V. Kamat; Chem. Rev. 2016, 116, 12956−13008.
2. M. V. Kovalenko, L. Protesescu, M. I. Bodnarchuk; Science, 2017, 358, 745–750.
3. S. Roy, M. K. Mahato, E. Prasad; Phys. Chem. Chem. Phys., 2023, 25, 4121.
4. S. Roy, E. Prasad, J. Phys. Chem. C, 2023; https://doi.org/10.1021/acs.jpcc.3c05555.