NDLI: Excitation Wavelength and Intensity-Dependent Multiexciton Dynamics in $CsPbBr_{3}$ Nanocrystals

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Excitation Wavelength and Intensity-Dependent Multiexciton Dynamics in $CsPbBr_{3}$ Nanocrystals

Content Provider	MDPI
Author	Qin, Chaochao Jiang, Zhinan Zhou, Zhongpo Liu, Yufang Jiang, Yuhai
Copyright Year	2021
Abstract	CsPbBr $_{3}$ has attracted great attention due to unique optical properties. The understanding of the multiexciton process is crucial for improving the performance of the photoelectric devices based on CsPbBr $_{3}$ nanocrystals. In this paper, the ultrafast dynamics of CsPbBr $_{3}$ nanocrystals is investigated by using femtosecond transient absorption spectroscopy. It is found that Auger recombination lifetime increases with the decrease of the excitation intensity, while the trend is opposite for the hot-exciton cooling time. The time of the hot-carriers cooling to the band edge is increased when the excitation energy is increased from 2.82 eV (440 nm) to 3.82 eV (325 nm). The lifetime of the Auger recombination reaches the value of 126 ps with the excitation wavelength of 440 nm. The recombination lifetime of the single exciton is about 7 ns in CsPbBr $_{3}$ nanocrystals determined by nanosecond time-resolved photoluminescence spectroscopy. The exciton binding energy is 44 meV for CsPbBr $_{3}$ nanocrystals measured by the temperature-dependent steady-state photoluminescence spectroscopy. These findings provide a favorable insight into applications such as solar cells and light-emitting devices based on CsPbBr $_{3}$ nanocrystals.
Starting Page	463
e-ISSN	20794991
DOI	10.3390/nano11020463
Journal	Nanomaterials
Issue Number	2
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-02-11
Access Restriction	Open
Subject Keyword	Nanomaterials Quantum Science and Technology Auger Recombination Hot-exciton Cooling Transient Absorption Spectroscopy Temperature-dependent Photoluminescence Spectroscopy
Content Type	Text
Resource Type	Article

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