(Invited) Charge Carrier Relaxation, Recombination and Extraction Dynamics in Metal Halide Perovskite Nanocrystals

Charge Carrier Relaxation, Recombination and Extraction Dynamics in Metal Halide Perovskite Nanocrystals Anunay Samanta School of Chemistry, University of Hyderabad, Hyderabad 500046 (anunay@uohyd.ac.in) The lead halide-based all-inorganic and hybrid perovskites are under intense investigation due to their immense potential in solar photovoltaic and light emitting applications. 1,2 As realization of the full potential of these materials in various applications requires a clear understanding of the relaxation pathways and dynamics of the photo-generated charge carriers, we have been studying these key photo-processes in a wide range of perovskite nanocrystals. 3-10 In this talk, we would like to present some of our recent results highlighting how a combination of femtosecond pump-probe and single-particle fluorescence techniques can be used to obtain valuable information on the nature and energy states of the photogenerated 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 caesium lead halide (CsPbX 3 ) perovskite nanocrystals. References Dey, A. et. al. ACS Nano 2021 , 15 , 10775. Green, M.A.; Ho-Baillie, A.; Snaith, H.J. Nature Photonics 2014 , 8 , 506. Mondal, N; De, A.; Das, S.; Paul, S.; Samanta, A. Nanoscale 2019 , 4 , 9796. Mondal, N; De, A.; Samanta, A. ACS Energy Letts. 2019 , 4 , 32. Seth, S.; Ahmed, T.; Samanta, A. J. Phys. Chem. Lett. 2018 , 9 , 7007. Mondal, N; De, A.; Samanta, A. J. Phys. Chem. Lett. 2018 , 9 , 3673. Ahmed, T; Seth. S.; Samanta, A. ACS Nano 2019 , 13 , 13537. De, A.; Das, A.; Samanta, A. ACS Energy Letts. 2020 , 5 , 2246. Ahmed, T.; Paul, S.; Samanta, A. J. Phys. Chem. C 2022 , 126 , 9109. Paul, S.; Samanta, A. J. Phys. Chem. Lett. 2022 , 13 , 5742.