Temperature-Dependent Recombination Dynamics of Photocarriers in CsPbBr3 Microcrystals Revealed by Ultrafast Terahertz Spectroscopy

被引：0

作者：

Lee, Sheng H. ^{[1
]}

Moon, Kyeongdeuk ^{[2
]}

Shoaib, Muhammad ^{[2
]}

Pedorella, Charles N. B. ^{[3
]}

OBrien, Kellen ^{[3
]}

Sher, Meng-Ju ^{[3
]}

Kim, Seokhyoung ^{[2
]}

Cocker, Tyler L. ^{[1
]}

机构：

[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[2] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

[3] Wesleyan Univ, Dept Phys, Middletown, CT 06459 USA

来源：

ADVANCED OPTICAL MATERIALS | 2024年 / 12卷 / 30期

关键词：

perovskite; spectroscopy; terahertz; ultrafast; CHARGE-CARRIER MOBILITIES; PEROVSKITES; ELECTRON; NANOCRYSTALS; TRANSITIONS; MECHANISMS; EFFICIENCY; LENGTHS; PROBE;

D O I：

10.1002/adom.202401162

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The ultrafast dynamics of photoexcited charge carriers are studied in micron-scale crystals composed of the inorganic perovskite CsPbBr3 with time-resolved terahertz spectroscopy. Exciting with photon energy close to the band edge, it is found that a fast (<10 ps) decay emerges in the terahertz photoconductivity with increasing pump fluence and decreasing temperature, dominating the dynamics at 4 K. The fluence-dependent dynamics can be globally fit by a nonlinear recombination model, which reveals that the influence of different nonlinear recombination mechanisms in the studied pump fluence range depends on temperature. Whereas the Auger scattering rate decreases with decreasing temperature from 77 to 4 K, the radiative recombination rate increases by three orders of magnitude. Spectroscopically, the terahertz photoconductivity resembles a Drude response at all delays, yet an additional Lorentz component due to an above-bandwidth resonance is needed to fully reproduce the data.

引用

页数：10

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