Ultrafast Exciton Dynamics of CH3NH3PbBr3 Perovskite Nanoclusters

Cherrette, Vivien L.; Chou, Kai-Chun; Zeitz, David; Guarino-Hotz, Melissa; Khvichia, Mariam; Barnett, Jeremey; Win, Allison; Babbe, Finn; Zhang, Jin Z.

doi:10.1021/acs.jpclett.4c01203

Title: Ultrafast Exciton Dynamics of CH₃NH₃PbBr₃ Perovskite Nanoclusters

Journal Article · 08 May 2024 · Journal of Physical Chemistry Letters

DOI: https://doi.org/10.1021/acs.jpclett.4c01203 · OSTI ID:2473044

Cherrette, Vivien L. ^[1];

^[1]; Zeitz, David ^[1];

^[1]; Khvichia, Mariam ^[1]; Barnett, Jeremey ^[1];

^[1];

^[2];

^[1]

University of California, Santa Cruz, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Exciton dynamics of perovskite nanoclusters has been investigated for the first time using femtosecond transient absorption (TA) and time-resolved photoluminescence (TRPL) spectroscopy. The TA results show two photoinduced absorption signals at 420 and 461 nm and a photoinduced bleach (PB) signal at 448 nm. The analysis of the PB recovery kinetic decay and kinetic model uncovered multiple processes contributing to electron-hole recombination. The fast component (~8 ps) is attributed to vibrational relaxation within the initial excited state, and the medium component (~60 ps) is attributed to shallow carrier trapping. The slow component is attributed to deep carrier trapping from the initial conduction band edge (~666 ps) and the shallow trap state (~40 ps). The TRPL reveals longer time dynamics, with modeled lifetimes of 6.6 and 93 ns attributed to recombination through the deep trap state and direct band edge recombination, respectively. In conclusion, the significant role of exciton trapping processes in the dynamics indicates that these highly confined nanoclusters have defect-rich surfaces.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); US National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; SC0021266

OSTI ID:: 2473044

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 19 Vol. 15; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Ultrafast Exciton Dynamics of CH3NH3PbBr3 Perovskite Nanoclusters

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Title: Ultrafast Exciton Dynamics of CH₃NH₃PbBr₃ Perovskite Nanoclusters