飞秒
纳米晶
超快激光光谱学
钙钛矿(结构)
纳秒
吸收(声学)
材料科学
卤化物
放松(心理学)
分析化学(期刊)
化学物理
光电子学
化学
光学
纳米技术
结晶学
激光器
物理
无机化学
社会心理学
心理学
色谱法
复合材料
作者
I-Hua Tsai,Sudhakar Narra,Sumit S. Bhosale,Eric Wei‐Guang Diau
标识
DOI:10.1021/acs.jpclett.3c00333
摘要
We report time-resolved spectral properties of highly stable and efficient red-emitting hybrid perovskite nanocrystals with the composition FA0.5MA0.5PbBr0.5I2.5 (FAMA PeNC) synthesized by using the hot-addition method. The PL spectrum of the FAMA PeNC shows a broad asymmetric band covering 580 to 760 nm with a peak at 690 nm which can be deconvoluted into two bands corresponding to the MA and FA domains. The interactions between the MA and FA domains are shown to affect the relaxation dynamics of the PeNCs from the subpicosecond to tens of nanoseconds scale. Time-correlated single-photon counting (TCSPC), femtosecond PL optical gating (FOG), and femtosecond transient absorption spectral (TAS) techniques were employed to study the intercrystal energy transfer (photon recycling) and intracrystal charge transfer processes between the MA and the FA domains of the crystals. These two processes are shown to increase the radiative lifetimes for the PLQYs exceeding 80%, which may play a key role in enhancing the performance of PeNC-based solar cells.
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