Slowing Down the Hot Carrier Relaxation Dynamics of CsPbX3 Nanocrystals by the Surface Passivation Strategy

被引:8
作者
Das, Antika [1 ]
Marjit, Kritiman [1 ]
Ghosh, Srijon [1 ]
Ghosh, Debarati [1 ]
Patra, Amitava [1 ,2 ]
机构
[1] Indian Assoc Cultivat Sci, Sch Mat Sci, Kolkata 700032, India
[2] Inst Nano Sci & Technol, Mohali 140306, India
关键词
HALIDE PEROVSKITES CSPBX3; CESIUM; BR; CL; EVOLUTION; ELECTRON; EXCITON;
D O I
10.1021/acs.jpcc.3c03728
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Lead halide perovskite nanocrystals (NCs) have recentlyemergedas cutting-edge semiconductor materials for the development of optoelectronicdevices. Exploitation of delayed hot carrier (HC) relaxation is aneffective way to increase the solar conversion efficiency further.Therefore, delaying the HC relaxation time is essential. Here, wehave reported a simple strategy to passivate the surface of CsPbX3 (X = Br/Cl) NCs with hexadecylamine (HDA) molecules, followedby exploitation of the femtosecond transient absorption spectroscopicinformation to determine the HC relaxation dynamics and ultrafastcarrier dynamics. Faster ultrafast carrier relaxation dynamics areobserved with the increasing Cl content in the CsPbX3 NCs(X = Br/Cl). Furthermore, we proposed slower ultrafast carrier relaxationdynamics along with longer HC relaxation time in the HDA-passivatedCsPbX(3) (X = Br/Cl) NCs compared to the pristine NCs. Thesubstantial increase in the initial HC temperature and a prolongedHC decay time additionally reveal the effective delay in HC coolingdynamics after the passivation of the NCs with HDA molecules. A thoroughunderstanding of the charge-carrier relaxation dynamics in CsPbX3 (X = Br/Cl) NCs will provide a way to design efficient optoelectronicdevices.
引用
收藏
页码:15385 / 15394
页数:10
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