标题：Effect of ferroelectricity on charge conduction in a PCBM/perovskite device structure
作者：Yin, Sun; Gao, Kun; Xie, Shijie; Saxena, Avadh
作者机构：[Yin, Sun; Gao, Kun; Xie, Shijie] Shandong Univ, Dept Phys, Jinan 250100, Shandong, Peoples R China.; [Yin, Sun; Gao, Kun; Xie, Shijie] Shandong Uni 更多
通讯作者地址：[Yin, S]Shandong Univ, Dept Phys, Jinan 250100, Shandong, Peoples R China;[Yin, S]Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Pe 更多
关键词：Ferroelectricity; Conduction; Perovskite solar cell; Poisson equation
摘要：The ferroelectricity in hybrid perovskite solar cells has attracted much attention and its effect on the device transport and photovoltaic properties is still under debate. In this paper, we investigate theoretically the effect of ferroelectricity on the redistribution of charge in a PCBM/perovskite device through the Poisson equation. The spontaneous polarization is set to be a hyperbolic tangent function of applied electrical field. The carriers in both the layers are assumed to be in quasi-equilibrium, and the (dark) current stems from the recombination at the PCBM/perovskite interface. The electrostatic potential profiles throughout the device and the current-bias (I - V) curves are obtained numerically. It is found that for the bias forward scan, larger potential drop will be on the PCBM layer, and for the bias reverse scan larger potential drop will be on the perovskite layer. The hysteresis of I - V curves is also obtained. These results shed new light on the effect of ferroelectricity in hybrid perovskite materials.