俘获
皮秒
材料科学
钙钛矿(结构)
纳秒
量子隧道
超短脉冲
激发
时间分辨率
化学物理
超快激光光谱学
激光器
分子物理学
原子物理学
光电子学
化学
物理
光学
量子力学
生物
结晶学
生态学
作者
Kanishka Kobbekaduwa,Shreetu Shrestha,Pan Adhikari,Exian Liu,L. B. Coleman,Jianbing Zhang,Ying Shi,Yuanyuan Zhou,Yehonadav Bekenstein,Feng Yan,Apparao M. Rao,Hsinhan Tsai,Matthew C. Beard,Wanyi Nie,Jianbo Gao
标识
DOI:10.1038/s41467-021-21946-2
摘要
Abstract We in-situ observe the ultrafast dynamics of trapped carriers in organic methyl ammonium lead halide perovskite thin films by ultrafast photocurrent spectroscopy with a sub-25 picosecond time resolution. Upon ultrafast laser excitation, trapped carriers follow a phonon assisted tunneling mechanism and a hopping transport mechanism along ultra-shallow to shallow trap states ranging from 1.72–11.51 millielectronvolts and is demonstrated by time-dependent and independent activation energies. Using temperature as an energetic ruler, we map trap states with ultra-high energy resolution down to < 0.01 millielectronvolt. In addition to carrier mobility of ~4 cm 2 V −1 s −1 and lifetime of ~1 nanosecond, we validate the above transport mechanisms by highlighting trap state dynamics, including trapping rates, de-trapping rates and trap properties, such as trap density, trap levels, and capture-cross sections. In this work we establish a foundation for trap dynamics in high defect-tolerant perovskites with ultra-fast temporal and ultra-high energetic resolution.
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