Power conversion efficiency (PCE) of CH₃NH₃PbI₃ perovskite solar cells has been developed rapidly, it reached the 22.1%. However, the anomalous hysteresis found in I-V measurements can cause an inaccurate estimation of the efficiency. In this article, we fabricated the ITO/PEDOT:PSS/CH₃NH₃PbI_3-xCl_x/

PCBM/PEIE/Al structure perovskite solar cell, we inserted an interface layer of Polyethylenimine ethoxylated (PEIE) into solar cell device between the PCBM and aluminum (Al) electrode, the electrical filed induce photoluminescence (PL) quenching experiment and capacitance-voltage characteristic both demonstrate that the PEIE layer exists an interface dipole effect in the perovskite solar cell device, it can effectively reduce the hysteresis effect in the I-V measurement, and greatly increase the solar cell's efficiency from the 10.93%–14.46%. Utilizing the photoinduction dielectric response technology, we further found that the interface dipole effect increased the built-in electrical field, and enhanced the charge carrier transport properties, consequently, increased the short-circuit current (J_sc). On the other hand, the interface dipole effect decreased the concentration of defect on the CH₃NH₃PbI_3-xCl_x surface, and made the charge injection barrier to increasing at the electrode and perovskite interface, leading to enhance the open-circuit voltage (V_oc). In addition, the diminution of defect could further increase more effective electron transport channels, leading to the more charge carriers transport toward to the corresponding electrode, and increased the solar cell's Fill Factor (FF). Therefore, the addition PEIE interface layer in the perovskite solar cell not only can remove the hysteresis effect but also develop the high PCE perovskite solar cell. We hope the interface dipole effect as an effective methods can greatly promote and develop high efficiency and stable perovskite solar cells.

CH ₃ NH ₃ PbI ₃钙钛矿太阳能电池的功率转换效率（PCE）发展迅速，达到22.1％。但是，IV测量中发现的异常磁滞现象可能导致效率估算不准确。在本文中，我们制作了ITO / PEDOT：PSS / CH ₃ NH ₃ PbI _3-x Cl _x /

PCBM / PEIE / Al结构的钙钛矿型太阳能电池，我们在PCBM和铝（Al）电极之间的太阳能电池器件中插入了聚乙烯亚胺乙氧基化（PEIE）的界面层，进行了电场诱导的光致发光（PL）猝灭实验和电容-电压特性两者都表明，PEIE层在钙钛矿型太阳能电池器件中存在界面偶极效应，可以有效降低IV测量中的磁滞效应，并将太阳能电池的效率从10.93％–14.46％大大提高。利用光感应介电响应技术，我们进一步发现界面偶极效应增加了内置电场，增强了载流子传输性能，因此增加了短路电流（J _sc）。另一方面，界面偶极效应降低了CH ₃ NH ₃ PbI _3-x Cl _x表面上的缺陷浓度，并使电荷注入势垒在电极和钙钛矿界面处增加，导致开路增强电压（V _oc）。另外，减少缺陷可以进一步增加更有效的电子传输通道，导致更多的载流子向相应的电极传输，并增加了太阳能电池的填充因子（FF）。因此，在钙钛矿太阳能电池中添加PEIE界面层不仅可以消除磁滞效应，而且可以开发出高PCE的钙钛矿太阳能电池。我们希望界面偶极效应作为一种有效的方法能够极大地促进和发展高效，稳定的钙钛矿太阳能电池。