Ultrafast THz Dynamics of Photocarriers in CsPbBr3 Microcrystals

We study the ultrafast dynamics of photoexcited charge carriers in micron-scale single crystals composed of the inorganic perovskite CsPbBr 3 with time-resolved THz spectroscopy. Exciting with photon energy close to the band edge, we find that a fast (\lt 10 ps) decay emerges with increasing fluence...

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Bibliographic Details
Main Authors: Lee, Sheng, Moon, Kyeongdeuk, Shoaib, Muhammad, Kim, Seokhyoung, Cocker, Tyler L.
Format: Conference Proceeding
Language:English
Subjects:
Behavioral sciences
Charge carriers
Crystals
Excitons
Perovskites
Spectroscopy
Spontaneous emission
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Summary:We study the ultrafast dynamics of photoexcited charge carriers in micron-scale single crystals composed of the inorganic perovskite CsPbBr 3 with time-resolved THz spectroscopy. Exciting with photon energy close to the band edge, we find that a fast (\lt 10 ps) decay emerges with increasing fluence and decreasing temperature, dominating the dynamics at 4 K. This behavior is well explained by Auger recombination. The THz photoconductivity resembles a Drude response, yet an additional Lorentz component due to an above-bandwidth exciton resonance is needed to satisfactorily reproduce the data
ISSN:2162-2035
DOI:10.1109/IRMMW-THz57677.2023.10299290