Extremely long-lived charge separation and related carrier spin excitation in CsPbBr_(3)perovskite quantum dots with an electron acceptor benzoquinone  

作　　者：Lin Cheng Rongrong Hu Meizhen Jiang Yumeng Men Yang Wang Jinlei Li Tianqing Jia Zhenrong Sun Donghai Feng 

机构地区：[1]State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200241,China [2]College of Sciences,Shanghai Institute of Technology,Shanghai 201418,China [3]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Nano Research》2024年第12期10649-10654,共6页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.12174108,91950112,12104311,12074123,and 12034008).

摘　　要：The formation and evolution dynamics of charge separation(CS)in a complex of CsPbBr_(3) quantum dots(QDs)and 1,4-benzoquinone(BQ)molecules are measured with a high-sensitive pump-orientation-probe technique by which spin signals of the CS state are monitored.An extraordinarily long-lasting CS is observed,with a characteristic time being up to a dozen days under ambient conditions,due to electron transferring from QDs to BQ molecules.Upon the long-lived CS,spin coherences of both electrons and holes are detected at room temperature,with a spin dephasing time of 420 and 26 ps,respectively.The long-lived CS and spin coherence have important implications for applications of perovskite nanomaterials in photocatalysis,photovoltaics,and spintronics.

关 键 词：charge separation perovskite quantum dots CsPbBr_(3) spin coherence pump-orientation-probe time-resolved ellipticity 

分 类 号：O646[理学—物理化学]