光伏
声子
钙钛矿(结构)
卤化物
光谱学
材料科学
化学物理
载流子
激发
带隙
光电子学
载流子散射
瓶颈
散射
凝聚态物理
化学
物理
光学
计算机科学
光伏系统
结晶学
无机化学
生态学
量子力学
嵌入式系统
生物
作者
Minjun Feng,Zuqiang Bian,Jia Wei Melvin Lim,Yuanyuan Guo,Rui Cai,Qiannan Zhang,Huajun He,Tze Chien Sum
出处
期刊:Small
[Wiley]
日期:2023-06-06
卷期号:19 (40)
被引量:4
标识
DOI:10.1002/smll.202301831
摘要
A fundamental understanding of the hot-carrier dynamics in halide perovskites is crucial for unlocking their prospects for next generation photovoltaics. Presently, a coherent picture of the hot carrier cooling process remains patchy due to temporally overlapping contributions from many-body interactions, multi-bands, band gap renormalization, Burstein-Moss shift etc. Pump-push-probe (PPP) spectroscopy recently emerges as a powerful tool complementing the ubiquitous pump-probe (PP) spectroscopy in the study of hot-carrier dynamics. However, limited information from PPP on the initial excitation density and carrier temperature curtails its full potential. Herein, this work bridges this gap in PPP with a unified model that retrieves these essential hot carrier metrics like initial carrier density and carrier temperature under the push conditions, thus permitting direct comparison with traditional PP spectroscopy. These results are well-fitted by the phonon bottleneck model, from which the longitudinal optical phonon scattering time τLO , for MAPbBr3 and MAPbI3 halide perovskite thin film samples are determined to be 240 ± 10 and 370 ± 10 fs, respectively.
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