The lead halide-based hybrid and all-inorganic perovskites are currently the focus of intense investigation because of their great potential in solar photovoltaic and light emitting applications.¹ As utilization of full potential of these substances in different applications requires a thorough understanding of the pathways through which the photo-generated charge carriers relax and the rate of their relaxation and capture by other substances prior to recombination, we have been studying these substances for the last few years addressing a variety of issues including those mentioned above.^2-9 This talk will focus on femtosecond pump-probe and single-particle photoluminescence studies that provide important information on the nature and energy states of the photo-generated species, pathways and dynamics of relaxation of the charge carriers, location and nature of the trap states and their role in fluctuation of the photoluminescence of different perovskite nanocrystals.

References

1. Dey, A. et. al. ACS Nano 2021, 15, 10775.
2. Mondal, N; De, A.; Das, S.; Paul, S.; Samanta, A. Nanoscale 2019, 4, 9796.
3. Mondal, N; De, A.; Samanta, A. ACS Energy Lett. 2019, 4, 32.
4. Seth, S.; Ahmed, T.; Samanta, A. J. Phys. Chem. Lett. 2018, 9, 7007.
5. Mondal, N; De, A.; Samanta, A. J. Phys. Chem. Lett. 2018, 9, 3673.
6. Ahmed, T; Seth. S.; Samanta, A. ACS Nano 2019, 13, 13537.
7. Paul, S.; Samanta, A. ACS Energy Lett. 2020, 5, 64.
8. Das, S.; De, A.; Samanta, A. J. Phys. Chem. Lett. 2020, 11, 1178.
9. Das, S.; Samanta, A. ACS Energy Lett. 2021, 6, 3780.