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.
. [J]. 中国物理快报, 2019, 36(2): 26701-.
Ao Zhang, Yun-Lin Chen, Chun-Xiu Zhang, Jun Yan. CH$_{3}$NH$_{3}$ Formed by Electron Injection at Heterojunction Inducing Peculiar Properties of CH$_{3}$NH$_{3}$PbI$_{3}$ Material. Chin. Phys. Lett., 2019, 36(2): 26701-.
2019, Vol. 36 
