Probing the Genuine Carrier Dynamics of Semiconducting Perovskites under Sunlight

Li, Bo-Han2,3; Li, Huang1,2,4; Di, Haipeng5; Xuan, Zhipeng6; Zeng, Wen1,2,3; Wang, Jia-Cheng1,2,3; Cheng, Da-Bing1,2; Zhou, Chuanyao1,2; Wang, Xingan4; Zhao, Yiying5; Zhang, Jingquan6; Ren, Zefeng1,2; Yang, Xueming1,2,7

2023-02-27

10.1021/jacsau.2c00581

JACS AU   Impact Factor & Quartile

2691-3704

Understanding the nature of photogenerated carriers and their subsequent dynamics in semiconducting perovskites is important for the development of solar cell materials and devices. However, most ultrafast dynamic measurements on perovskite materials were conducted under high carrier densities, which likely obscures the genuine dynamics under low carrier densities in solar illumination conditions. In this study, we presented a detailed experimental study of the carrier density -dependent dynamics in hybrid lead iodide perovskites from femtosecond to microsecond using a highly sensitive transient absorption (TA) spectrometer. From the dynamic curves with low carrier density in the linear response range, we observed two fast trapping processes that occurred in less than 1 ps and tens of picoseconds, attributed to the shallow traps, and two slow decays with lifetimes of hundreds of nanoseconds and longer than 1 mu s, related to the trap-assisted recombination and trapping at deep traps. Further TA measurements clearly show that PbCl2 passivation can effectively reduce both shallow and deep trap densities. These results provide insights into the intrinsic photophysics of semiconducting perovskites with direct implications for photovoltaic and optoelectronic applications under sunlight.

perovskite linear response ultrafast carrier dynamics low carrier density under sunlight

ESCI

English

Others

Ministry of Science and Technology of China["2018YFA0208700","2019YFE0120000"] ; Dalian Institute of Chemical Physics, Chinese Academy of Sciences[I202003] ; National Natural Science Foundation of China["22073097","21688102"] ; Chinese Academy of Sciences[YSBR-007] ; Science and Technology Program of Sichuan Province["2019ZDZX0015","2021YFG0102"] ; null[2019YFG0513]

Chemistry

Chemistry, Multidisciplinary

WOS:000938763800001

AMER CHEMICAL SOC

Web of Science

1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dynam Res Ctr Energy & Environm Mat, Dalian 116023, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China
5.China Acad Engn Phys, Inst Mat, Jiangyou 621908, Peoples R China
6.Sichuan Univ, Coll Mat Sci & Engn, Inst Solar Energy Mat & Devices, Chengdu 610065, Peoples R China
7.Southern Univ Sci & Technol, Dept Chem, Shenzhen 518055, Peoples R China

Li, Bo-Han,Li, Huang,Di, Haipeng,et al. Probing the Genuine Carrier Dynamics of Semiconducting Perovskites under Sunlight[J]. JACS AU,2023,3(2).

Li, Bo-Han.,Li, Huang.,Di, Haipeng.,Xuan, Zhipeng.,Zeng, Wen.,...&Yang, Xueming.(2023).Probing the Genuine Carrier Dynamics of Semiconducting Perovskites under Sunlight.JACS AU,3(2).

Li, Bo-Han,et al."Probing the Genuine Carrier Dynamics of Semiconducting Perovskites under Sunlight".JACS AU 3.2(2023).