| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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CH$_{3}$NH$_{3}$ Formed by Electron Injection at Heterojunction Inducing Peculiar Properties of CH$_{3}$NH$_{3}$PbI$_{3}$ Material |
| Ao Zhang1,2**, Yun-Lin Chen1**, Chun-Xiu Zhang2, Jun Yan1 |
1Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044
2Beijing Institute of Graphic Communication, Beijing 102600
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| Cite this article: |
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Ao Zhang, Yun-Lin Chen, Chun-Xiu Zhang et al 2019 Chin. Phys. Lett. 36 026701 |
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Abstract The effect of formed CH$_{3}$NH$_{3}$ at the heterojunction on properties of CH$_{3}$NH$_{3}$PbI$_{3}$ material is investigated based on experiment and theoretical calculation. Our calculation results show that the giant dielectric constant, anomalous hysteresis and long-lasting polarization for CH$_{3}$NH$_{3}$PbI$_{3}$ originate from the formed CH$_{3}$NH$_{3}$ at the heterojunction. It is found that the induced weak EPS by the reorientation of CH$_{3}$NH$_{3}$ sub-group along the built-in electric field enables us to effectively increase the ordering of entire lead-halide framework. In addition, the heterojunction has an advantage of channel separation between carrier transport and electron diffusion. These properties of the heterojunction are the main origin of the high efficiency of CH$_{3}$NH$_{3}$PbI$_{3}$ solar cells.
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Received: 03 September 2018
Published: 22 January 2019
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| PACS: |
67.30.hp
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(Interfaces)
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71.23.An
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(Theories and models; localized states)
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72.40.+w
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(Photoconduction and photovoltaic effects)
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88.40.H-
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(Solar cells (photovoltaics))
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| Fund: Supported by the National Natural Science Foundation of China under Grant No 61875235, the Ph.D. Programs Foundation of Ministry of Education of China under Grant No 20130009110008, and the Beijing Municipal Education Commission Project under Grant No KM201210015008. |
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