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Polaronic transport in CH3NH3PbI3 single crystals

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Abstract

Organic–inorganic hybrid perovskite materials exhibit excellent features in the photovoltaic applications. However, there are still questions unanswered regarding fundamental mechanisms of high-performance perovskite devices. Hall Effect and time-resolved photoluminescence measurements are conducted in our research to reveal the nature of carrier transport in CH3NH3I3 single crystals. We found that the high mobility of the crystals falls with increasing temperature, while the slow recombination rate constant of the crystals increases with increasing temperature. The former supports that coherent transport takes place in the CH3NH3PbI3 single crystals, whereas the latter evidences that photo-induced minority carriers exhibit their heavy effective mass in the transport. The two apparently distinct features are complementary in the description of the nature of polaronic motions in the CH3NH3PbI3 materials. These dynamical considerations depict a large polaron moving slowly while scattering with phonons in the CH3NH3PbI3 single crystals.

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Acknowledgements

The Natural Science Research for Colleges and Universities of Anhui Province, China (Grant No. KJ2019ZD06) supported this work. The authors thank Dr. Yi Rao and Dr. Bradford Wayland for helpful discussions. L.J thanks Dr. Xiaoxing Xi for assisting us to collect Hall effect data.

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Authors and Affiliations

  1. Powder Metallurgy Research Institute, Central South University, Changsha, 410083, People’s Republic of China

    Lei Jin

  2. Department of Chemistry and Biochemistry, Utah State University, Logan, UT, 84322, USA

    Yuqin Qian & Shoujun Ding

  3. School of Physics and Technology, Wuhan University, Wuhan, 430072, People’s Republic of China

    Yipei Zhang

  4. School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis, OR, 97331, USA

    Michael Bowen

  5. School of Mathematics and Physics, Anhui University of Technology, Maanshan, 243002, People’s Republic of China

    Shoujun Ding

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  1. Lei Jin
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Jin, L., Qian, Y., Zhang, Y. et al. Polaronic transport in CH3NH3PbI3 single crystals. J Mater Sci: Mater Electron 31, 1945–1950 (2020). https://doi.org/10.1007/s10854-019-02713-y

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