Abstract
Perovskite materials have outstanding photoelectric properties and can be used in optoelectronic devices. The dynamics of photo-excited carriers in the perovskite can determine the photoelectric properties of these optoelectronic devices. In this paper, the dynamics of photo-excited carriers in CsPbBr<sub>3</sub> quantum dots is studied via pump-probe transient absorption spectroscopy, and the transient absorption spectrum is analyzed by singular value decomposition and global fitting. The results show the red-shift and blue-shift of the band edge can be attributed to the exciton-exciton interaction and Burstein-Moss effect, respectively. The results also reveal the dynamics and corresponding preexponential factors spectra of photo-excited carriers. The relaxation time of hot carriers is 0.4 ps, decay times in the order of ten picoseconds and hundred picoseconds can be attributed to the lifetime of both double excitons and charged excitons, while the decay time on the order of nanoseconds can be attributed to the radiative recombination of excitons.
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