| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Ultrafast Terahertz Probes of Charge Transfer and Recombination Pathway of CH$_{3}$NH$_{3}$PbI$_{3}$ Perovskites |
| Hui-Jie Yan1, Zhi-Liang Ku2, Xue-Feng Hu1, Wan-Ying Zhao1, Min-Jian Zhong1, Qi-Biao Zhu1, Xian Lin1, Zuan-Ming Jin1**, Guo-Hong Ma1** |
1Department of Physics, Shanghai University, Shanghai 200444
2State Key Laboratory of Advanced Technology For Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070
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| Cite this article: |
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Hui-Jie Yan, Zhi-Liang Ku, Xue-Feng Hu et al 2018 Chin. Phys. Lett. 35 028401 |
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Abstract We use transient terahertz photoconductivity measurements to demonstrate that upon optical excitation of CH$_{3}$NH$_{3}$PbI$_{3}$ perovskite, the hole transfer from CH$_{3}$NH$_{3}$PbI$_{3}$ into the organic hole-transporting material (HTM) Spiro-OMeTAD occurs on a sub-picosecond timescale. Second-order recombination is the dominant decay pathway at higher photo-excitation fluences as observed in neat CH$_{3}$NH$_{3}$PbI$_{3}$ films. In contrast, under similar experimental conditions, second-order recombination weakly contributes the relatively slow recombination between the electrons in the perovskite and the injected holes in HTM, as a loss mechanism at the CH$_{3}$NH$_{3}$PbI$_{3}$/Spiro-OMeTAD interface. Our results offer insights into the intrinsic photophysics of CH$_{3}$NH$_{3}$PbI$_{3}$-based perovskites with direct implications for photovoltaic devices and optoelectronic applications.
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Received: 21 September 2017
Published: 23 January 2018
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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 11674213, 11604202 and 61735010, the Young Eastern Scholar at Shanghai Institutions of Higher Learning under Grant No QD2015020, the Universities Young Teachers Training Funding Program under Grant No ZZSD15098, and the 'Chen Guang' Project of Shanghai Municipal Education Commission and Shanghai Education Development Foundation under Grant No 16CG45. |
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