| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Ultrafast Carrier Dynamics and Terahertz Photoconductivity of Mixed-Cation and Lead Mixed-Halide Hybrid Perovskites |
| Wan-Ying Zhao1, Zhi-Liang Ku2, Li-Ping Lv3, Xian Lin1, Yong Peng2, Zuan-Ming Jin1,4**, Guo-Hong Ma1,4**, Jian-Quan Yao5 |
1Department of Physics, Shanghai University, Shanghai 200444
2State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070
3Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444
4STU & SIOM Joint Laboratory for Superintense Lasers and Applications, Shanghai 201210
5College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University, Tianjin 300072
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| Cite this article: |
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Wan-Ying Zhao, Zhi-Liang Ku, Li-Ping Lv et al 2019 Chin. Phys. Lett. 36 028401 |
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Abstract Using time-dependent terahertz spectroscopy, we investigate the role of mixed-cation and mixed-halide on the ultrafast photoconductivity dynamics of two different methylammonium (MA) lead-iodide perovskite thin films. It is found that the dynamics of conductivity after photoexcitation reveals significant correlation on the microscopy crystalline features of the samples. Our results show that mixed-cation and lead mixed-halide affect the charge carrier dynamics of the lead-iodide perovskites. In the (5-AVA)$_{0.05}$(MA)$_{0.95}$PbI$_{2.95}$Cl$_{0.05}$/spiro thin film, we observe a much weaker saturation trend of the initial photoconductivity with high excitation fluence, which is attributed to the combined effect of sequential charge carrier generation, transfer, cooling and polaron formation.
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Received: 05 September 2018
Published: 22 January 2019
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| PACS: |
84.60.Jt
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(Photoelectric conversion)
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78.47.-p
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(Spectroscopy of solid state dynamics)
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07.57.Ty
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(Infrared spectrometers, auxiliary equipment, and techniques)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11604202, 11674213, 61735010 and 51603119, the Young Eastern Scholar under Grant Nos QD2015020 and QD2016027, the Shanghai Rising-Star Program under Grant No 18QA1401700, the 'Chen Guang' Project under Grant Nos 16CG45 and 16CG46, the Shanghai Municipal Education Commission, and the Shanghai Education Development Foundation. |
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