钙钛矿(结构)
纳米晶
材料科学
量子点
飞秒
量子隧道
光电子学
激子
半导体
光谱学
超快激光光谱学
纳米技术
载流子
化学物理
凝聚态物理
化学
物理
光学
激光器
结晶学
量子力学
作者
Gang Wang,Bobo Yang,Shiliang Mei,Bingzhe Wang,Zhipeng Zhang,Yulin Mao,Jia Guo,Guohong Ma,Ruiqian Guo,Guichuan Xing
出处
期刊:Small
[Wiley]
日期:2023-12-06
被引量:2
标识
DOI:10.1002/smll.202307785
摘要
Abstract Manipulation of persistent charges in semiconductor nanostructure is the key point to obtain quantum bits towards the application of quantum memory and information devices. However, realizing persistent charge storage in semiconductor nano‐systems is still very challenge due to the disturbance from crystal defects and environment conditions. Herein, the two‐photon persistent charging induced long‐lasting afterglow and charged exciton formation are observed in CsPbBr 3 perovskite nanocrystals (NCs) confined in glass host with effective lifetime surpassing one second, where the glass inclosure provides effective protection. A method combining the femtosecond and second time‐resolved transient absorption spectroscopy is explored to determine the persistent charging possibility of perovskite NCs unambiguously. Meanwhile, with temperature‐dependent spectroscopy, the underlying mechanism of this persistent charging is elucidated. A two‐channel carrier transfer model is proposed involving athermal quantum tunneling and slower thermal‐assisted channel. On this basis, two different information storage devices are demonstrated with the memory time exceeding two hours under low‐temperature condition. These results provide a new strategy to realize persistent charging in perovskite NCs and deepen the understanding of the underlying carrier kinetics, which may pave an alternative way towards novel information memory and optical data storage applications.
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