Ultrafast Spin Relaxation of Charge Carriers in Strongly Quantum Confined Methylammonium Lead Bromide Perovskite Magic-Sized Clusters

被引：0
|
作者：
Zeitz, David C. [1 ]
Cherrette, Vivien L. [1 ]
Creech, Sarah A. [1 ]
Li, Yan [2 ]
Ping, Yuan [3 ]
Zhang, Jin Z. [1 ]
机构：
[1] Univ Calif Santa Cruz, Dept Chem & Biochem, Santa Cruz, CA 95064 USA
[2] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[3] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA
来源：
ACS PHYSICAL CHEMISTRY AU | 2024年
关键词：
Spin dynamics; nanoclusters; magic-sized clusters; metal halide perovskite; ultrafast; SPINTRONICS; ABSORPTION; EMISSION; DYNAMICS; GROWTH;
D O I：
10.1021/acsphyschemau.4c00051
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Spin relaxation of charge carriers in strongly quantum confined perovskite magic-sized clusters has been probed, for the first time, by using polarization-controlled femtosecond transient absorption (fs-TA) spectroscopy. Fs-TA measurements with a circularly polarized pump and probe allowed for the determination of the exciton spin relaxation lifetime (similar to 1.5 ps) at room temperature based on the dynamics of a photoinduced absorption (PIA) feature peaked at 458 nm. This spin lifetime is shorter than that of perovskite quantum dots (PQDs) with a larger size, and the results suggest that exciton confinement and defects likely play a more important role in these strongly quantum confined magic-sized clusters with a larger surface-to-volume ratio.
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页数：5
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